NVidia GeForce 8800 GT *and* GeForce GTX 285 in a Mac Pro?

Hi,
my Mac Pro came with an nVidia GeForce 8800 GT, and I've now bought an extra GeForce GTX 285 Mac Edition (for the Compute Level 1.3 double precision floating point capability in CUDA).
(Everything bought from the Mac Store)
I wasn't aware that I was expected to throw away the GeForce 8800 GT , what with the other three PCI-e slots being free.
The GTX 285 (max requirement: 204 W) requires two extra PCI-e power connectors. The 8800 GT (max: 110 W) uses one. There are only two available from the motherboard though.
So, *although I realize this isn't supported*, has anyone else managed to scrounge some current from somewhere else on the motherboard?
I'm only using one hard drive and one optical drive and no other PCI-e cards. Surely the power supply (around 1000 W ?) can supply the extra?
Does anyone know how much current the PCI-e extra power connectors are rated for?
Thanks,
colin

Search long enough and you may find...
According to this
http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress
The PCI-e slot can supply up to 75 W, whilst a 6 pin cable can provide another 75 W.
So:
2 PCI-e slots + 2 auxiliary 6-pin connector = 300 W
"Even with only two 12 volt lines the standard implementation of PCI Express power cables use large enough gauge wire and a good enough connector to provide much more than the three amps per wire required to provide 75 watts. Nonetheless, the 6 pin PCI Express power cable officially provides only 75 watts. *In all likelihood, however, real implementations of this power cable can provide far more than 75 watts.* "
Hmmm

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