Tom's Hardware > Forum > Graphic & Displays > Graphics Cards > How do they connect the two 12 v rails for graphics?

How do they connect the two 12 v rails for graphics?

Forum Graphic & Displays : Graphics Cards - How do they connect the two 12 v rails for graphics?

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WeirdMystery   04-27-2009 at 02:46:41 AM

I'm totally a newbie. First I was intrested on the 9800 gtx + it needed two pci e connectors which I am using 1 pci e and two perherpial or molex, then I was looking at the gts 250, the difference was the clock is faster. The 250 needs only 1 pci e. Which got me worried my powersupply's rails are 18amps each. If I add them up its more then enough for the 9800 gtx+ , I also got convinced that it does add up the two rails since one is pci e connector and other the other pci e. The 250 has only 1 pci e, this makes me concerened, will the pci e only supply one rail which is 18 amps or am I really dumb and misunderstanding this.

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rolli59   04-27-2009 at 02:51:41 AM
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The 250 has one connector beause it consumes less power than the 9800GTX+ (called progress). You have nothing to worry about with your dual 18amp rails.

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Bronze Graphics badge Bluescreendeath   04-27-2009 at 03:33:59 AM
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The GTS250 uses marginally less power than the 9800GTX/GTX+.

The 9800GTX needed just enough extra power for an extra PCI-e connector

------------------------------ i7 920, E5300
GTX260, HD4870, HD4830
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