Yeah, thats just what they recommend for the average system as a whole. A 9800GT gets 75W from the slot, think a PCIe 2.0 slot might be 100W and another 75W from the 6 pin PCIe connector so 150W/175W is the most it can pull anyway. Never saw a test to see how many amps it can pull just by itself, but I'm sure its nowhere near 24 amps.