New GPU power supply woes (ASUS GT640 + HP XW4600)

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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