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I have a new GPU - ASUS Geforce GT640 - which doesn't require (or have connector) for separate power supply, however when plugged into a HP XW4600 the machine fails to boot - 4 beeps in a cycle.

I didn't spec this, the person that did assumed the PSU wasn't up to it, so purchased a 750W replacement, however this doesn't make any difference.

The XW4600 Mainboard has printed on: SLOT2 PCIe2 x16 75w + 75w, so I'm guessing the PCIe bus can't deliver enough power to the GPU - is there any workaround for this? Could the fan connector be disconnected and reconnected to some sort of PSU adapter rather than from the BUS?

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Is there a molex connector somewhere on the motherboard? – Journeyman Geek Jun 20 '12 at 10:35
Something is wrong with the premise of your question. The GT460 is a 150W (or so) monster, requiring two 6-pin power connectors. – David Schwartz Jun 20 '12 at 11:33
David is right, the DEFAULT requirements for all GTX460 is 2x 6pin PCI-E Power Connectors. Either you don't have a GTX460 or you haven't spotted the connectors. – Oliver G Jun 20 '12 at 11:44
sorry I have transposed the full text statement the card is (as the title states) a GT640 – user18055 Jun 20 '12 at 12:14

I know this is ancient, but this isn't a power problem, HP crippled the bios in these and nvidia cards newer than the 5xx series will not post.

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That's an interesting claim. If you could share some evidence or at least citation, that would be great. – Larssend Nov 26 '15 at 0:24

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