Does FSB speed matter?
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From: abcdefgh on 20 Apr 2008 17:06 Hello! Here is two CPUs: Core 2 Duo E4700 (2.6GHz, 800 FSB, L2: 2MB) Core 2 Duo E6700 (2.66GHz,1066 FSB, L2: 4MB) The biggest differences about the processors: the FSB. Let's fancy another two processors: A: Core 2 Duo (2.6GHz, 800 FSB, L2: 2MB) B: Core 2 Duo (2.6GHz, 1066 FSB, L2: 2MB) Can I feel different performance if I don't change anithing in the computer except the CPUs (A -> B)? Of course, the motherboard support both type of CPU. Does FSB speed matter? Thank You!
From: Mike Walsh on 20 Apr 2008 20:30 FSB speed does matter, but you will need faster memory to take advantage of the higher bus speed. L2 cache size also matters. There could also be other differences between processor cores, although I believe all Core 2 chips operate essentially the same. abcdefgh(a)coder.hu wrote: > > Hello! > > Here is two CPUs: > > Core 2 Duo E4700 (2.6GHz, 800 FSB, L2: 2MB) > Core 2 Duo E6700 (2.66GHz,1066 FSB, L2: 4MB) > > The biggest differences about the processors: the FSB. Let's fancy > another two processors: > > A: Core 2 Duo (2.6GHz, 800 FSB, L2: 2MB) > B: Core 2 Duo (2.6GHz, 1066 FSB, L2: 2MB) > > Can I feel different performance if I don't change anithing in the > computer except the CPUs (A -> B)? Of course, the motherboard support > both type of CPU. > > Does FSB speed matter? > > Thank You! -- Mike Walsh
From: Darklight on 21 Apr 2008 03:34 abcdefgh(a)coder.hu wrote: > Hello! > > Here is two CPUs: > > Core 2 Duo E4700 (2.6GHz, 800 FSB, L2: 2MB) > Core 2 Duo E6700 (2.66GHz,1066 FSB, L2: 4MB) > > The biggest differences about the processors: the FSB. Let's fancy > another two processors: > > A: Core 2 Duo (2.6GHz, 800 FSB, L2: 2MB) > B: Core 2 Duo (2.6GHz, 1066 FSB, L2: 2MB) > > Can I feel different performance if I don't change anithing in the > computer except the CPUs (A -> B)? Of course, the motherboard support > both type of CPU. > > Does FSB speed matter? > > Thank You! question is do you need the extra speed and are you willing to pay extra to upgrade the ram
From: abcdefgh on 21 Apr 2008 04:59 On Apr 21, 9:34 am, Darklight <nglenng...(a)netscape.net> wrote: > abcde...(a)coder.hu wrote: > > Hello! > > > Here is two CPUs: > > > Core 2 Duo E4700 (2.6GHz, 800 FSB, L2: 2MB) > > Core 2 Duo E6700 (2.66GHz,1066 FSB, L2: 4MB) > > > The biggest differences about the processors: the FSB. Let's fancy > > another two processors: > > > A: Core 2 Duo (2.6GHz, 800 FSB, L2: 2MB) > > B: Core 2 Duo (2.6GHz, 1066 FSB, L2: 2MB) > > > Can I feel different performance if I don't change anithing in the > > computer except the CPUs (A -> B)? Of course, the motherboard support > > both type of CPU. > > > Does FSB speed matter? > > > Thank You! > > question is do you need the extra speed and are you willing to pay extra to > upgrade the ram Thanks Mike! The RAM in the machine is fast as possible but the CPU is not. I want to replace the Pentium D but I didn't know, witch one is the better choice. Darklight, I've got 4 GB RAM but the CPU is "not the best".
From: kony on 21 Apr 2008 09:39 On Mon, 21 Apr 2008 01:59:34 -0700 (PDT), abcdefgh(a)coder.hu wrote: >On Apr 21, 9:34�am, Darklight <nglenng...(a)netscape.net> wrote: >> abcde...(a)coder.hu wrote: >> > Hello! >> >> > Here is two CPUs: >> >> > Core 2 Duo E4700 (2.6GHz, �800 FSB, � L2: 2MB) >> > Core 2 Duo E6700 (2.66GHz,1066 FSB, L2: 4MB) >> >> > The biggest differences about the processors: the FSB. False, the 2nd has double the L2 cache which is about 5-15% performance difference on average, depending on the application. In other words, the 2nd CPU is faster than the first, and priced accordingly. You are making a simple choice difficult, the choice being whether you are willing to pay more for more performance (same choice as always, with every year and every family of CPU). >> >Let's fancy >> > another two processors: >> >> > A: Core 2 Duo (2.6GHz, �800 FSB, � L2: 2MB) >> > B: Core 2 Duo (2.6GHz, �1066 FSB, �L2: 2MB) >> >> > Can I feel different performance if I don't change anithing in the >> > computer except the CPUs (A -> B)? Of course, the motherboard support >> > both type of CPU. No you won't feel, or perceive the difference, but the same is true for each minor difference in performance in memory or video, HDD, etc. In other words if you add up several parts in a PC, each of which is barely enough of a performance increase to notice, the end sum of all improvements IS enough to notice. Pick the fastest FSB and largest L2 cache the budget will reasonably allow, unless you plan on overclocking. If you plan on overclocking, getting a processor with lower default FSB (if all else were equal) would allow raising FSB more for higher O'C before you hit a FSB limit. >> >> > Does FSB speed matter? Of course it does, why else do you think they would be using faster FSB than previously? >> >> > Thank You! >> >> question is do you need the extra speed and are you willing to pay extra to >> upgrade the ram > >Thanks Mike! > >The RAM in the machine is fast as possible but the CPU is not. As fast as possible is not a specific. You want a specific answer to a specific question you have not asked, and you have not provided the specifics of the other parts nor the tasks you run. > >I want >to replace the Pentium D You are not being specific about what Pentium D you have, nor what your motherboard's max FSB is which may be lower than 1066 if the motherboard is very old. > but I didn't know, witch one is the better >choice. > >Darklight, >I've got 4 GB RAM but the CPU is "not the best". Neither of the CPUs listed is "the best" either, so ultimately you have not supplied the relevant information for us to help you make any meaningful choice. It would be more helpful to you if you listed the following: - Current motherboard make and model - Number of memory modules, total capacity (listed again in concise form), spec'd speed - Desired CPU price, budget range - Applications in which you need the performance boost most. Some old Pentium D boards don't even use DDR2 memory, having the fastest DDR(1) memory like PC3200, makes it fairly irrelevant if your board has the fastest memory it can support as it would still bottleneck the CPU. Also we don't know but assume you do, whether your board supports the above listed processors. A generic answer is as written above, pick larger L2 cache and faster FSB for more performance if the mobo supports that FSB, unless you are overclocking in which case you want lower FSB than the max your board supports so you have some room to increase FSB (since multiplier cannot be raised).
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