well do you need a PSU? do you have a sli moatherboard? if you dont have the sli moatherboard then its better to get 1 7800gtx...but if you do and need a better PSU then the 2 7800gt's is better.
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The Comp:
CPU--Athlon64 X2 4200+ Manchester @ 2.5!!!:D
HDD--WD Caviar 250GB 7200 RPM SATA
MB---DFI LANPARTY UT nF4 SLI-DR
RAM--OCZ Titanium 2GB (2 x 1GB)
GPU--Sapphire ATI Radeon X1900XTX 512mb
SPU--Creative Sound Blaster Audigy2 ZS
PSU--ENERMAX Whisper II 535W
all inside a Thermaltake Matrix VX
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