It shouldn't lower the performance unless the PSU is old and has low amps, which in this case it wouldn't be the adapters fault. The 7800GTX is very high-end and will need a very good Power Supply.
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NZXT Nemesis Elite Black
Intel Q6600 @ 3.20 Ghz
COOLER MASTER RL-EUL-GBU1-GP Watercooling
Gigabyte DS3R P965
HDDs: 2 x 80GB 1 x 250GB 1 x 500GB 1x 750GB
2 x 1GB Patriot Extreme Perf. DDR2
nVidia 8800GT 512MB
Antec Smartpower 2.0 400 Watt
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