Does the 6800GT come with its own power connector (i.e. directly from the board to the PSU)? If so, then I think it draws power from both rails (from the motherboard via the PCI-E slot, and from the cable plugged directly into the PSU).
But as I understand it, even disregarding the fact that no single 12V rail can put out more than 16.5a (max), you can't just add 16.5 + 15 and assume you'll get 31.5a if you max out both rails. Most PSUs seem to have a cap on total 12V current that is less than the sum of the max output of both...
I just put together my first system, with the following hardware:
Athlon 64 3200+ Winchester (939)
MSI Neo4 Platinum mobo
Thermaltake Tsunami Case w/400w psu
WD 800JB 7200rpm 8MB cache HD
Chaintech 6600GT 128MB PCI-E x16
Zalman 7000B AlCu HSF
The thing has six total fans (not counting...
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