type of RAM to add which is economical
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From: s on 14 Oct 2009 21:12 My system configuration is mentioned below /////////////////////////////////////////////////////////////////////////////////////////////////// Computer: Operating System Microsoft Windows XP Professional OS Service Pack Service Pack 2 DirectX 4.09.00.0904 (DirectX 9.0c) Motherboard: CPU Type Intel Pentium 4 640, 3200 MHz (16 x 200) Motherboard Name Hewlett-Packard HP Compaq dc7600 Convertible Minitower Motherboard Chipset Intel Lakeport-G i945G System Memory 1024 MB (DDR2-533 DDR2 SDRAM) BIOS Type Compaq (05/18/05) Front Side Bus Properties: Bus Type Intel NetBurst Bus Width 64-bit Real Clock 200 MHz (QDR) Effective Clock 800 MHz Bandwidth 6400 MB/s Memory Bus Properties: Bus Type Dual DDR2 SDRAM Bus Width 128-bit Real Clock 267 MHz (DDR) Effective Clock 533 MHz Bandwidth 8533 MB/s Chipset Bus Properties: Bus Type Intel Direct Media Interface BIOS Properties: Vendor Hewlett-Packard Version 786D1 v01.03 Release Date 05/18/2005 Size 1024 KB System Properties: Manufacturer Hewlett-Packard Product HP Compaq dc7600 Convertible Minitower Motherboard Properties: Manufacturer Hewlett-Packard Product 09F0h Motherboard Name Hewlett-Packard HP Compaq dc7600 Convertible Minitower Chipset Properties: Motherboard Chipset Intel Lakeport-G i945G Memory Timings 4-4-4-12 (CL-RCD-RP-RAS) Processor Properties: Manufacturer Intel Version Intel(R) Pentium(R) 4 CPU 3.20GHz External Clock 800 MHz Maximum Clock 6000 MHz Current Clock 3200 MHz Type Central Processor Voltage 1.2 V Status Enabled Socket Designation XU1 PROCESSOR Processor Properties: Manufacturer Intel Maximum Clock 6000 MHz Type Central Processor Voltage 1.2 V Upgrade Slot 1 Socket Designation XU1 PROCESSOR 2 Memory Device Properties: Form Factor DIMM Type Detail Synchronous Size 512 MB Speed 533 MHz Total Width 64-bit Data Width 64-bit Device Locator XMM1 Physical Address Extension (PAE): Supported by Operating System Yes Supported by CPU Yes Active Yes Memory Module Properties: Module Name Infineon 64T64000HU3.7A Serial Number 020DEF15h Manufacture Date Week 23 / 2006 Module Size 512 MB (1 rank, 4 banks) Module Type Unbuffered Memory Type DDR2 SDRAM Memory Speed DDR2-533 (266 MHz) Module Width 64 bit Module Voltage SSTL 1.8 Error Detection Method None Refresh Rate Reduced (7.8 us), Self-Refresh Memory Timings: @ 266 MHz 5.0-4-4-12 (CL-RCD-RP-RAS) @ 266 MHz 4.0-4-4-12 (CL-RCD-RP-RAS) @ 200 MHz 3.0-3-3-9 (CL-RCD-RP-RAS) Memory Module Features: Early RAS# Precharge Supported Auto-Precharge Not Supported Precharge All Not Supported Write1/Read Burst Not Supported Buffered Address/Control Inputs Not Supported Registered Address/Control Inputs Not Supported On-Card PLL (Clock) Not Supported Buffered DQMB Inputs Not Supported Registered DQMB Inputs Not Supported Differential Clock Input Not Supported Redundant Row Address Not Supported Memory Module Manufacturer: Company Name Infineon Technologies AG Product Information http://www.infineon.com/cgi-bin/i...do?tabId=1 [ DIMM3: Infineon 64T64000HU3.7A ] Memory Module Properties: Module Name Infineon 64T64000HU3.7A Serial Number 020DE710h Manufacture Date Week 23 / 2006 Module Size 512 MB (1 rank, 4 banks) Module Type Unbuffered Memory Type DDR2 SDRAM Memory Speed DDR2-533 (266 MHz) Module Width 64 bit Module Voltage SSTL 1.8 Error Detection Method None Refresh Rate Reduced (7.8 us), Self-Refresh Memory Timings: @ 266 MHz 5.0-4-4-12 (CL-RCD-RP-RAS) @ 266 MHz 4.0-4-4-12 (CL-RCD-RP-RAS) @ 200 MHz 3.0-3-3-9 (CL-RCD-RP-RAS) Memory Module Features: Early RAS# Precharge Supported Auto-Precharge Not Supported Precharge All Not Supported Write1/Read Burst Not Supported Buffered Address/Control Inputs Not Supported Registered Address/Control Inputs Not Supported On-Card PLL (Clock) Not Supported Buffered DQMB Inputs Not Supported Registered DQMB Inputs Not Supported Differential Clock Input Not Supported Redundant Row Address Not Supported Memory Module Manufacturer: Company Name Infineon Technologies AG Product Information http://www.infineon.com/cgi-bin/i...do?tabId=1 CPU Speed: CPU Clock 3191.66 MHz (original: 3200 MHz) CPU Multiplier 16.0x CPU FSB 199.48 MHz (original: 200 MHz) Memory Bus 265.97 MHz SPD Memory Modules: DIMM1: Infineon 64T64000HU3.7A 512 MB DDR2-533 DDR2 SDRAM (5.0-4-4-12 @ 266 MHz) (4.0-4-4-12 @ 266 MHz) (3.0-3-3-9 @ 200 MHz) DIMM3: Infineon 64T64000HU3.7A 512 MB DDR2-533 DDR2 SDRAM (5.0-4-4-12 @ 266 MHz) (4.0-4-4-12 @ 266 MHz) (3.0-3-3-9 @ 200 MHz) /////////////////////////////////////////////////////////////////////////////////////////////////// I went to Crucial(www.crucial.com) and for my HP - Compaq dc7600 Series Convertible Minitower Desktop/PC machine the suggested memory upgrade was 1GB, 240-pin DIMM, DDR2 PC2-5300 memory module CT907869 costing about 23$. And, would my system be compatible with that RAM. I guess it may, but I am a newbie in RAM so would appreciate any advice. Can I find it for less price than that? Can someone please clarify? Thanks a lot.
From: peter on 14 Oct 2009 21:54 http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=115&prodSeriesId=472276&prodTypeId=12454&objectID=c01682745 if you look at the above page you will see that the system has 4 Ram slots. You will also see the warning that you need to place equal RAM in "B' as you have in "A". You have 512 in each of Dimm 1 and 3 so therefore you can place 1gb of RAM in Dimm 2 so as not to lose dual channel mode...or you can place 512 in each of 2 and 4 . $23.00 is a pretty reasonable price but if you want to search more you need to match the specs that you presently have DDR2-533 DDR2 SDRAM (5.0-4-4-12 @ 266 MHz) (4.0-4-4-12 @ 266 MHz) you are running this one at present time (3.0-3-3-9 @ 200 MHz) peter -- If you find a posting or message from me offensive,inappropriate or disruptive,please ignore it. If you dont know how to ignore a posting complain to me and I will be only too happy to demonstrate :-) "s" <s(a)mailinator.com> wrote in message news:38d2fd91-f046-4ac8-834a-6365a7076562(a)p23g2000vbl.googlegroups.com... > My system configuration is mentioned below > > /////////////////////////////////////////////////////////////////////////////////////////////////// > > Computer: > Operating System Microsoft Windows XP Professional > OS Service Pack Service Pack 2 > DirectX 4.09.00.0904 (DirectX 9.0c) > > Motherboard: > CPU Type Intel Pentium 4 640, 3200 MHz (16 x 200) > Motherboard Name Hewlett-Packard HP Compaq dc7600 Convertible > Minitower > Motherboard Chipset Intel Lakeport-G i945G > System Memory 1024 MB (DDR2-533 DDR2 SDRAM) > BIOS Type Compaq (05/18/05) > > > Front Side Bus Properties: > Bus Type Intel NetBurst > Bus Width 64-bit > Real Clock 200 MHz (QDR) > Effective Clock 800 MHz > Bandwidth 6400 MB/s > > Memory Bus Properties: > Bus Type Dual DDR2 SDRAM > Bus Width 128-bit > Real Clock 267 MHz (DDR) > Effective Clock 533 MHz > Bandwidth 8533 MB/s > > Chipset Bus Properties: > Bus Type Intel Direct Media Interface > > > BIOS Properties: > Vendor Hewlett-Packard > Version 786D1 v01.03 > Release Date 05/18/2005 > Size 1024 KB > > > System Properties: > Manufacturer Hewlett-Packard > Product HP Compaq dc7600 Convertible Minitower > > Motherboard Properties: > Manufacturer Hewlett-Packard > Product 09F0h > > Motherboard Name Hewlett-Packard HP Compaq dc7600 Convertible > Minitower > > Chipset Properties: > Motherboard Chipset Intel Lakeport-G i945G > Memory Timings 4-4-4-12 (CL-RCD-RP-RAS) > > Processor Properties: > Manufacturer Intel > Version Intel(R) Pentium(R) 4 CPU 3.20GHz > External Clock 800 MHz > Maximum Clock 6000 MHz > Current Clock 3200 MHz > Type Central Processor > Voltage 1.2 V > Status Enabled > Socket Designation XU1 PROCESSOR > > Processor Properties: > Manufacturer Intel > Maximum Clock 6000 MHz > Type Central Processor > Voltage 1.2 V > Upgrade Slot 1 > Socket Designation XU1 PROCESSOR 2 > > > Memory Device Properties: > Form Factor DIMM > Type Detail Synchronous > Size 512 MB > Speed 533 MHz > Total Width 64-bit > Data Width 64-bit > Device Locator XMM1 > > > Physical Address Extension (PAE): > Supported by Operating System Yes > Supported by CPU Yes > Active Yes > > Memory Module Properties: > Module Name Infineon 64T64000HU3.7A > Serial Number 020DEF15h > Manufacture Date Week 23 / 2006 > Module Size 512 MB (1 rank, 4 banks) > Module Type Unbuffered > Memory Type DDR2 SDRAM > Memory Speed DDR2-533 (266 MHz) > Module Width 64 bit > Module Voltage SSTL 1.8 > Error Detection Method None > Refresh Rate Reduced (7.8 us), Self-Refresh > > Memory Timings: > @ 266 MHz 5.0-4-4-12 (CL-RCD-RP-RAS) > @ 266 MHz 4.0-4-4-12 (CL-RCD-RP-RAS) > @ 200 MHz 3.0-3-3-9 (CL-RCD-RP-RAS) > > Memory Module Features: > Early RAS# Precharge Supported > Auto-Precharge Not Supported > Precharge All Not Supported > Write1/Read Burst Not Supported > Buffered Address/Control Inputs Not Supported > Registered Address/Control Inputs Not Supported > On-Card PLL (Clock) Not Supported > Buffered DQMB Inputs Not Supported > Registered DQMB Inputs Not Supported > Differential Clock Input Not Supported > Redundant Row Address Not Supported > > Memory Module Manufacturer: > Company Name Infineon Technologies AG > Product Information http://www.infineon.com/cgi-bin/i...do?tabId=1 > > [ DIMM3: Infineon 64T64000HU3.7A ] > > Memory Module Properties: > Module Name Infineon 64T64000HU3.7A > Serial Number 020DE710h > Manufacture Date Week 23 / 2006 > Module Size 512 MB (1 rank, 4 banks) > Module Type Unbuffered > Memory Type DDR2 SDRAM > Memory Speed DDR2-533 (266 MHz) > Module Width 64 bit > Module Voltage SSTL 1.8 > Error Detection Method None > Refresh Rate Reduced (7.8 us), Self-Refresh > > Memory Timings: > @ 266 MHz 5.0-4-4-12 (CL-RCD-RP-RAS) > @ 266 MHz 4.0-4-4-12 (CL-RCD-RP-RAS) > @ 200 MHz 3.0-3-3-9 (CL-RCD-RP-RAS) > > Memory Module Features: > Early RAS# Precharge Supported > Auto-Precharge Not Supported > Precharge All Not Supported > Write1/Read Burst Not Supported > Buffered Address/Control Inputs Not Supported > Registered Address/Control Inputs Not Supported > On-Card PLL (Clock) Not Supported > Buffered DQMB Inputs Not Supported > Registered DQMB Inputs Not Supported > Differential Clock Input Not Supported > Redundant Row Address Not Supported > > Memory Module Manufacturer: > Company Name Infineon Technologies AG > Product Information http://www.infineon.com/cgi-bin/i...do?tabId=1 > > CPU Speed: > CPU Clock 3191.66 MHz (original: 3200 MHz) > CPU Multiplier 16.0x > CPU FSB 199.48 MHz (original: 200 MHz) > Memory Bus 265.97 MHz > > SPD Memory Modules: > DIMM1: Infineon 64T64000HU3.7A 512 MB DDR2-533 DDR2 SDRAM (5.0-4-4-12 > @ 266 MHz) (4.0-4-4-12 @ 266 MHz) (3.0-3-3-9 @ 200 MHz) > DIMM3: Infineon 64T64000HU3.7A 512 MB DDR2-533 DDR2 SDRAM (5.0-4-4-12 > @ 266 MHz) (4.0-4-4-12 @ 266 MHz) (3.0-3-3-9 @ 200 MHz) > > /////////////////////////////////////////////////////////////////////////////////////////////////// > > I went to Crucial(www.crucial.com) and for my HP - Compaq dc7600 > Series Convertible Minitower Desktop/PC machine the suggested memory > upgrade was 1GB, 240-pin DIMM, DDR2 PC2-5300 memory module CT907869 > costing about 23$. And, would my system be compatible with that RAM. I > guess it may, but I am a newbie in RAM so would appreciate any advice. > > Can I find it for less price than that? > > Can someone please clarify? > > Thanks a lot.
From: s on 14 Oct 2009 22:49 Peter/Paul, I appreciate the prompt and detailed replies from both of you. On Oct 14, 9:54 pm, "peter" <pe...(a)nowhere.net> wrote: > http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en.... > > if you look at the above page you will see that the system has 4 Ram slots. > You will also see the warning that > you need to place equal RAM in "B' as you have in "A". You have 512 in each > of Dimm 1 and 3 so therefore you can > place 1gb of RAM in Dimm 2 so as not to lose dual channel mode...or you can > place 512 in each of 2 and 4 . This, I don't understand. What is "A" for my machine and what is "B". If Dimm 1 and Dimm 3 are "A" for me, can I place 1GB each in Dimm2 and Dimm4 assuming Dimm 2 and Dimm 4 are "B" for me? > $23.00 is a pretty reasonable price but if you want to search more you need > to match the specs that you presently have > DDR2-533 DDR2 SDRAM (5.0-4-4-12 @ 266 MHz) > (4.0-4-4-12 @ 266 MHz) you > are running this one at present time > (3.0-3-3-9 @ 200 MHz) Yes, but I was worried more about the quality as I have not purchased something from Crucial before. And, a tool downloaded from Crucial scanned my system and recommended that RAM for me. I vaguely know that 4.0-4-4-12 @ 266 MHz represents memory latency. So, I need to search for something which matches 3.0-3-3-9 @ 200 MHz as the other two (5.0-4-4-12 @ 266 MHz and 4.0-4-4-12 @ 266 MHz) are being used? Sorry, I am a newbie in RAM so don't know much. Thanks for your advice and time. > "s" <s...(a)mailinator.com> wrote in message > > news:38d2fd91-f046-4ac8-834a-6365a7076562(a)p23g2000vbl.googlegroups.com... > > > My system configuration is mentioned below > > > /////////////////////////////////////////////////////////////////////////////////////////////////// > > > Computer: > > Operating System Microsoft Windows XP Professional > > OS Service Pack Service Pack 2 > > DirectX 4.09.00.0904 (DirectX 9.0c) > > > Motherboard: > > CPU Type Intel Pentium 4 640, 3200 MHz (16 x 200) > > Motherboard Name Hewlett-Packard HP Compaq dc7600 Convertible > > Minitower > > Motherboard Chipset Intel Lakeport-G i945G > > System Memory 1024 MB (DDR2-533 DDR2 SDRAM) > > BIOS Type Compaq (05/18/05) > > > Front Side Bus Properties: > > Bus Type Intel NetBurst > > Bus Width 64-bit > > Real Clock 200 MHz (QDR) > > Effective Clock 800 MHz > > Bandwidth 6400 MB/s > > > Memory Bus Properties: > > Bus Type Dual DDR2 SDRAM > > Bus Width 128-bit > > Real Clock 267 MHz (DDR) > > Effective Clock 533 MHz > > Bandwidth 8533 MB/s > > > Chipset Bus Properties: > > Bus Type Intel Direct Media Interface > > > BIOS Properties: > > Vendor Hewlett-Packard > > Version 786D1 v01.03 > > Release Date 05/18/2005 > > Size 1024 KB > > > System Properties: > > Manufacturer Hewlett-Packard > > Product HP Compaq dc7600 Convertible Minitower > > > Motherboard Properties: > > Manufacturer Hewlett-Packard > > Product 09F0h > > > Motherboard Name Hewlett-Packard HP Compaq dc7600 Convertible > > Minitower > > > Chipset Properties: > > Motherboard Chipset Intel Lakeport-G i945G > > Memory Timings 4-4-4-12 (CL-RCD-RP-RAS) > > > Processor Properties: > > Manufacturer Intel > > Version Intel(R) Pentium(R) 4 CPU 3.20GHz > > External Clock 800 MHz > > Maximum Clock 6000 MHz > > Current Clock 3200 MHz > > Type Central Processor > > Voltage 1.2 V > > Status Enabled > > Socket Designation XU1 PROCESSOR > > > Processor Properties: > > Manufacturer Intel > > Maximum Clock 6000 MHz > > Type Central Processor > > Voltage 1.2 V > > Upgrade Slot 1 > > Socket Designation XU1 PROCESSOR 2 > > > Memory Device Properties: > > Form Factor DIMM > > Type Detail Synchronous > > Size 512 MB > > Speed 533 MHz > > Total Width 64-bit > > Data Width 64-bit > > Device Locator XMM1 > > > Physical Address Extension (PAE): > > Supported by Operating System Yes > > Supported by CPU Yes > > Active Yes > > > Memory Module Properties: > > Module Name Infineon 64T64000HU3.7A > > Serial Number 020DEF15h > > Manufacture Date Week 23 / 2006 > > Module Size 512 MB (1 rank, 4 banks) > > Module Type Unbuffered > > Memory Type DDR2 SDRAM > > Memory Speed DDR2-533 (266 MHz) > > Module Width 64 bit > > Module Voltage SSTL 1.8 > > Error Detection Method None > > Refresh Rate Reduced (7.8 us), Self-Refresh > > > Memory Timings: > > @ 266 MHz 5.0-4-4-12 (CL-RCD-RP-RAS) > > @ 266 MHz 4.0-4-4-12 (CL-RCD-RP-RAS) > > @ 200 MHz 3.0-3-3-9 (CL-RCD-RP-RAS) > > > Memory Module Features: > > Early RAS# Precharge Supported > > Auto-Precharge Not Supported > > Precharge All Not Supported > > Write1/Read Burst Not Supported > > Buffered Address/Control Inputs Not Supported > > Registered Address/Control Inputs Not Supported > > On-Card PLL (Clock) Not Supported > > Buffered DQMB Inputs Not Supported > > Registered DQMB Inputs Not Supported > > Differential Clock Input Not Supported > > Redundant Row Address Not Supported > > > Memory Module Manufacturer: > > Company Name Infineon Technologies AG > > Product Informationhttp://www.infineon.com/cgi-bin/i...do?tabId=1 > > > [ DIMM3: Infineon 64T64000HU3.7A ] > > > Memory Module Properties: > > Module Name Infineon 64T64000HU3.7A > > Serial Number 020DE710h > > Manufacture Date Week 23 / 2006 > > Module Size 512 MB (1 rank, 4 banks) > > Module Type Unbuffered > > Memory Type DDR2 SDRAM > > Memory Speed DDR2-533 (266 MHz) > > Module Width 64 bit > > Module Voltage SSTL 1.8 > > Error Detection Method None > > Refresh Rate Reduced (7.8 us), Self-Refresh > > > Memory Timings: > > @ 266 MHz 5.0-4-4-12 (CL-RCD-RP-RAS) > > @ 266 MHz 4.0-4-4-12 (CL-RCD-RP-RAS) > > @ 200 MHz 3.0-3-3-9 (CL-RCD-RP-RAS) > > > Memory Module Features: > > Early RAS# Precharge Supported > > Auto-Precharge Not Supported > > Precharge All Not Supported > > Write1/Read Burst Not Supported > > Buffered Address/Control Inputs Not Supported > > Registered Address/Control Inputs Not Supported > > On-Card PLL (Clock) Not Supported > > Buffered DQMB Inputs Not Supported > > Registered DQMB Inputs Not Supported > > Differential Clock Input Not Supported > > Redundant Row Address Not Supported > > > Memory Module Manufacturer: > > Company Name Infineon Technologies AG > > Product Informationhttp://www.infineon.com/cgi-bin/i...do?tabId=1 > > > CPU Speed: > > CPU Clock 3191.66 MHz (original: 3200 MHz) > > CPU Multiplier 16.0x > > CPU FSB 199.48 MHz (original: 200 MHz) > > Memory Bus 265.97 MHz > > > SPD Memory Modules: > > DIMM1: Infineon 64T64000HU3.7A 512 MB DDR2-533 DDR2 SDRAM (5.0-4-4-12 > > @ 266 MHz) (4.0-4-4-12 @ 266 MHz) (3.0-3-3-9 @ 200 MHz) > > DIMM3: Infineon 64T64000HU3.7A 512 MB DDR2-533 DDR2 SDRAM (5.0-4-4-12 > > @ 266 MHz) (4.0-4-4-12 @ 266 MHz) (3.0-3-3-9 @ 200 MHz) > > > /////////////////////////////////////////////////////////////////////////////////////////////////// > > > I went to Crucial(www.crucial.com) and for my HP - Compaq dc7600 > > Series Convertible Minitower Desktop/PC machine the suggested memory > > upgrade was 1GB, 240-pin DIMM, DDR2 PC2-5300 memory module CT907869 > > costing about 23$. And, would my system be compatible with that RAM. I > > guess it may, but I am a newbie in RAM so would appreciate any advice. > > > Can I find it for less price than that? > > > Can someone please clarify? > > > Thanks a lot.
From: peter on 15 Oct 2009 10:23 This, I don't understand. What is "A" for my machine and what is "B". > If Dimm 1 and Dimm 3 are "A" for me, can I place 1GB each in Dimm2 > and Dimm4 assuming Dimm 2 and Dimm 4 are "B" for me? Dimm 1 and 3 are A Dimm 2 and 4 are B they need to be populated equally for best performance The Total amount of RAM in A should equal the total amount of RAM in B AT present time you have total of 1 gig (2x512) in 1 and 3 so if you buy another gig it goes into 2 and this gives you dual channel Chipset Properties: >> > Motherboard Chipset Intel Lakeport-G i945G >> > Memory Timings 4-4-4-12 (CL-RCD-RP-RAS) This is what your RAM is running at right now...this is what you should try to match in timings peter -- If you find a posting or message from me offensive,inappropriate or disruptive,please ignore it. If you dont know how to ignore a posting complain to me and I will be only too happy to demonstrate :-) >
From: larry moe 'n curly on 15 Oct 2009 12:54 s wrote: > [40,000 lines deleted] > I went to Crucial(www.crucial.com) and for my HP - Compaq dc7600 > Series Convertible Minitower Desktop/PC machine the suggested memory > upgrade was 1GB, 240-pin DIMM, DDR2 PC2-5300 memory module CT907869 > costing about 23$. And, would my system be compatible with that RAM. I > guess it may, but I am a newbie in RAM so would appreciate any advice. > > Can I find it for less price than that? > > Can someone please clarify? Check www.salescircular.com for local store offers, but beware that they typically leave out Fry's (www.frys.com , if there are no stores in your area). You don't absolutely need PC5300 but can use PC6400, which is sometimes on sale for less. If you have to buy memory by mail, get Crucial because it's about the only retail DRAM sold in the US that's always made with chips branded by the actual chip maker, as opposed to branded by the module maker because such chips are never tested to as strict standards as the what the actual chip makers require for their prime quality chips. And don't think that heatsinks mean higher quality because they don't. OTOH if you buy locally and can see the modules before purchase, look for chips with part numbers or logos from Samsung (usually just "SEC"), Micron (MT part number or just an "M" with an ellipse circling it), Qimonda, Nanya, ProMOS, Power Chip, Hynix, Elpida, or Winbond. I've seen those names on some modules from PNY, Centon, Kbyte, and even Kingston, companies that normally use no-name chips with their own brand or mystery brand markings printed on them. Don't accept DDR2 desktop memory with a voltage rating higher than 1.8V because it means the memory failed testing at 1.8V (and rather lax testing at that). All the chip manufacturers specify 1.8V nominal for DDR2, except for special low voltage DDR2 rated for 1.5V.
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