at the moment i have 2 ati saphire 4890 cards. i just wana know wat works better with my mother board?? should i replace the 4890 with these GF 9600 GT ??????

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My Computer
- Computer Manufacturer/Model Number
- gigabyte
- OS
- windows 7 64bit
- CPU
- intel core 2 duo E8600 @3.33ghz
- Motherboard
- gigabyte ep45-ds5 (socket 775)
- Memory
- 8.0gb dual-channel DDR2 @400mhz (6-6-6-18
- Graphics Card(s)
- 2X ATI Radeon HD 4800 series (sapphire) crossfire
- Sound Card
- realtek high definition audio
- Monitor(s) Displays
- benq E2200w (digital)
- Screen Resolution
- 1680 x 1050
- Hard Drives
- 1 313GB Western digital WDC