Regarding PCI-e video power requirements:
There was some confusion between Intel & nVidia about how much current was
to be available for this. Initially, Intel specified 75W. nVidia wanted 150W
available. So some time later, Intel & nVidia agreed, and 150W is the
correct max power draw that should be available on the PCI-e graphics line.
Many PSU makers went with the original 75W requirement. You have to check on
the fine print on "PCI-e ready" advertised PSUs to find out whether it's 75W
or 150W. If 75W, newer generations of power hungry PCI-e video cards will
not be supported.
The Seasonic S12 500/600 both provide 150W on their PCI-e video output line.
It's not clear how many others do; last I shopped around in 05, the majority
were only 75W
From: "Greg Sevart" <[EMAIL PROTECTED]>
Reply-To: The Hardware List <[email protected]>
To: "The Hardware List" <[email protected]>
Subject: Re: [H] Question on dual 12V rails
Date: Wed, 10 May 2006 09:28:38 -0500
Unless I'm mistaken, the only thing SeaSonic did (I have a S12-600) was to
add a second 6pin SLI connector. I am uncertain as to if the second
connector pulls off the 12V1 or 12V2 rail. I would hope it pulls off the
12V1 rail, but I suspect it may pull off the 12V2 along with everything
else not on the motherboard.
The Intel ATX12V v2.2 power supply design guideline makes no specific
mention of SLI (section 4.5.x, mechanical DC connectors)--it simply states
that any +12V rail that exceeds 18A (sections 1.2.1, 1.2.3, and 3.2.4)
should be split into two rails, with individual current limiting devices.
Greg
----- Original Message ----- From: "Hayes Elkins"
<[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, May 10, 2006 8:31 AM
Subject: Re: [H] Question on dual 12V rails
Newer ATX12V v2's supply 175W to the SLI connections, as opposed to only
75 in the old standard. Seasonic's S12 series were the first to address
the potential problem with newer power hungry SLI cards.
From: "Greg Sevart" <[EMAIL PROTECTED]>
Reply-To: The Hardware List <[email protected]>
To: "The Hardware List" <[email protected]>
Subject: Re: [H] Question on dual 12V rails
Date: Wed, 10 May 2006 08:24:38 -0500
Typically, one +12v rail goes to the motherboard (ATX/SSI, 4pin +12, 8pin
+12), and the other rail covers everything else...including the standard
4pin molex, SATA power, and any SLI power connectors. Unfortunately, the
dual rail system was developed before SLI became a reality, and is a piss
poor design when SLI is considered.
Greg
----- Original Message ----- From: "Thane Sherrington (S)"
<[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, May 10, 2006 7:54 AM
Subject: [H] Question on dual 12V rails
If a power supply has two 12V rails, how does it split up which goes
where? Do the SATA power cables use the same 12V as the PATA power
cables?
T
