Re: [H] Power supplies and system requirements
At 06:33 AM 03/01/2007, dhs wrote: Understand. I simply do not know. I'll talk offline to some power gurus my brother-in-law works with. Good question. Wondered about this myself now that current technology is so power humgry. That would be great. I can't find anything that really answers these questions. I did find that the 4 pin motherboard connector is generally a separate rail and powers just the CPU. So on a two 12V rail PS, that means the CPU is on one rail, and everything else is on the other rail. On a three 12V rail PS, the motherboard is on rail1, the CPU on rail2, and the six pin PCIe connector is rail3. As the number of rails goes up, it appears each additional rail is connected to a 6 pin connector. However, not all PSes work like this as the spec isn't carved in stone. And apparently the motherboard can supply 12V power to the CPU via the large power connector as well, which clouds matters. (One would think that manufacturers would want to clear this up.) T
Re: [H] Power supplies and system requirements
Understand. I simply do not know. I'll talk offline to some power gurus my brother-in-law works with. Good question. Wondered about this myself now that current technology is so power humgry. Duncan On Tue, 02 Jan 2007 18:08 , Thane Sherrington [EMAIL PROTECTED] sent: At 12:43 PM 02/01/2007, dhs wrote: T, No. Not w/o a print of the dist. wiring. Would think that all 12v rails are really in parallel to a common source unless specied otherwise (or the PSU has multiple 12v cards inside...jmho). So how does one figure out if the power supply can handle the 12V requirements out there now? I mean, if I have three 12V rails with 24A each, and I'm pulling 15A for the video card, 4A for the hard drives, and 10A for the CPU, then I'm at 29A, so unless I'm splitting the rails, I'm going to end up with one overloaded rail and two rails doing nothing. Or are you saying that in reality, I have one 12V rail with 68A? T This email scanned for Viruses and Spam by ZCloud.net
[H] Power supplies and system requirements
If I'm trying to spec out a power supply that has multiple 12V rails (I've seen up to five 12V rails) can I just add the rails together to see if it has enough power on the 12V rail or do I have to figure out which devices pull power on which of the 12V rails? (Is there a way to figure out which rail is being used by each device?) T
Re: [H] Power supplies and system requirements
T, No. Not w/o a print of the dist. wiring. Would think that all 12v rails are really in parallel to a common source unless specied otherwise (or the PSU has multiple 12v cards inside...jmho). otoh, I suppose you could trace each 12v wire back to its' source point and determine a current path from that investigation. I'm no expert. ymmv. I remain a pcpc fan-boy. Still waiting to test/try a SeaSonic offering some time in 2007. I expect my last Enermax to croak this year :) Best, Duncan On Tue, 02 Jan 2007 14:56 , Thane Sherrington [EMAIL PROTECTED] sent: If I'm trying to spec out a power supply that has multiple 12V rails (I've seen up to five 12V rails) can I just add the rails together to see if it has enough power on the 12V rail or do I have to figure out which devices pull power on which of the 12V rails? (Is there a way to figure out which rail is being used by each device?) T This email scanned for Viruses and Spam by ZCloud.net
Re: [H] Power supplies and system requirements
At 12:43 PM 02/01/2007, dhs wrote: T, No. Not w/o a print of the dist. wiring. Would think that all 12v rails are really in parallel to a common source unless specied otherwise (or the PSU has multiple 12v cards inside...jmho). So how does one figure out if the power supply can handle the 12V requirements out there now? I mean, if I have three 12V rails with 24A each, and I'm pulling 15A for the video card, 4A for the hard drives, and 10A for the CPU, then I'm at 29A, so unless I'm splitting the rails, I'm going to end up with one overloaded rail and two rails doing nothing. Or are you saying that in reality, I have one 12V rail with 68A? T
Re: [H] Power supplies and system requirements
Thane Sherrington wrote: At 12:43 PM 02/01/2007, dhs wrote: T, No. Not w/o a print of the dist. wiring. Would think that all 12v rails are really in parallel to a common source unless specied otherwise (or the PSU has multiple 12v cards inside...jmho). So how does one figure out if the power supply can handle the 12V requirements out there now? I mean, if I have three 12V rails with 24A each, and I'm pulling 15A for the video card, 4A for the hard drives, and 10A for the CPU, then I'm at 29A, so unless I'm splitting the rails, I'm going to end up with one overloaded rail and two rails doing nothing. Or are you saying that in reality, I have one 12V rail with 68A? It's the latter, though I doubt designers considered one rail drawing all the current like that.
