12 volt rail?
in [Dell]
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From: Justbob30 on 29 Dec 2009 21:23 I hade a e-520 with a 305w power supply, I want to replace the aging ati1350 pro video card with an nvidia 240...I have been told I need a 300 w power supply, which I do and that I need a 12 volt rail which I have no idea what that is...does anyone...I can't find it on the Dell website, I find the marking 12va & 12vb can't exceed 264 w/18a (or similar) is that it?
From: RnR on 30 Dec 2009 08:51 On Tue, 29 Dec 2009 18:23:16 -0800, "Justbob30" <NoThank(a)you.com> wrote: >I hade a e-520 with a 305w power supply, I want to replace the aging ati1350 >pro video card with an nvidia 240...I have been told I need a 300 w power >supply, which I do and that I need a 12 volt rail which I have no idea what >that is...does anyone...I can't find it on the Dell website, I find the >marking 12va & 12vb can't exceed 264 w/18a (or similar) is that it? Bob, let me begin with "I don't know". That said, rarely do I find people on the net that say they really needed to swap out their dell power supply because it didn't crank out enough power. I've read that the dell supplies are often under rated. I know this doesn't really answer your question but I guess I'd find out what is the add'l load from the card you want to use and then see if you can measure the "normal" load your machine pulls and compare to the 300watts. I think there is software to do this, if my memory is correct. As to the 12v rail, I have no clue since I never read about this. I assume (??) that you already Googled for this info and found little hence you came here. Hope someone can be of better help than myself here :(
From: William R. Walsh on 30 Dec 2009 10:23 Hi! Your Dell power supply should handle the load without issue. Dell does underrate most of their power supplies (the only exceptions being recent desktop systems with cheap Bestec supplies). Every computer power supply has "rails" or as they're more correctly known, "voltage rails". A voltage rail is the name for the circuitry that generates a given voltage in a power supply. Computer power supplies will have several voltage rails, usually at least one for each voltage they produce. Some power supplies have multiple voltage rails outputting the same voltage. This is sometimes done so that an item which draws a lot of power won't be competing with other devices for that power. The video card you are considering is saying that it would be ideal to have a power supply with a separate voltage rail to meet the card's needs. There are two theories that I know of concerning power supply design. One theory goes that you should use multiple rails producing the same voltage to relieve stress on the circuitry--one voltage rail doesn't have to bear the load of every device in the system using that voltage to operate. The other theory (used by PC Power and Cooling) goes that one BIG rail (one for each voltage and particularly +12V) is better because it is simpler (fewer but hopefully heavier parts) and you don't end up having extra capacity "trappped" on a voltage rail where you can't use it. What your video card documentation implies is that your video card will also have a connection on the card itself for power. It will get some power from the motherboard, but more power must be supplied for correct operation, and this comes from a cord that you will plug into an open connector coming from the power supply and the video card. William
From: Justbob30 on 30 Dec 2009 20:18 Thanks, that made far more sense than what I found by googling. "William R. Walsh" <wm_walsh(a)hotmail.com> wrote in message news:f49e755b-ce96-4611-b7c1-a0041ad2c4e9(a)k19g2000yqc.googlegroups.com... > Hi! > > Your Dell power supply should handle the load without issue. Dell does > underrate most of their power supplies (the only exceptions being > recent desktop systems with cheap Bestec supplies). > > Every computer power supply has "rails" or as they're more correctly > known, "voltage rails". A voltage rail is the name for the circuitry > that generates a given voltage in a power supply. Computer power > supplies will have several voltage rails, usually at least one for > each voltage they produce. > > Some power supplies have multiple voltage rails outputting the same > voltage. This is sometimes done so that an item which draws a lot of > power won't be competing with other devices for that power. The video > card you are considering is saying that it would be ideal to have a > power supply with a separate voltage rail to meet the card's needs. > > There are two theories that I know of concerning power supply design. > One theory goes that you should use multiple rails producing the same > voltage to relieve stress on the circuitry--one voltage rail doesn't > have to bear the load of every device in the system using that voltage > to operate. The other theory (used by PC Power and Cooling) goes that > one BIG rail (one for each voltage and particularly +12V) is better > because it is simpler (fewer but hopefully heavier parts) and you > don't end up having extra capacity "trappped" on a voltage rail where > you can't use it. > > What your video card documentation implies is that your video card > will also have a connection on the card itself for power. It will get > some power from the motherboard, but more power must be supplied for > correct operation, and this comes from a cord that you will plug into > an open connector coming from the power supply and the video card. > > William
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