Adding another GPU does not double the power. Having 2 cards is more like 1.4x the power, but for some games at high resolutions, this extra boost can mean a big visible difference.
Is it just me, or does SLI seem to give much bigger gains than Crossfire? I was looking at tomshardware, FPS totals, and 2 Radeon 4850s in CF didn't even match up with one 4870. Meanwhile, 2 9600GTs in SLI scored very high.
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= Helpful info about upgrading=
CPU: AMD Phenom II 720 BE (@3.4 GHz, 1.4v, Zalman CNPS9700)
GPU: Sapphire Radeon HD 4870 1gb
Mobo: MSI K9A2 CF v2 - 790X chipset
RAM: G.Skill 4 GB (2x2) PC2-8500 1066
HDD: Seagate Barracuda 7200.12 500gb
PSU: Antec EA650
Case: Cooler Master CM690
Monitor: LG 22" Widescreen LCD (2ms)
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