I couldnt find any direct 9800 vs 8200 benchmarks but... One 9800 GTX typically benchmarks about 10 times faster than one 8400.

So yeah, a single 9800GTX+ would be MUCH faster than a pair of 8200.

I had no problem running Crysis 2 at "Advanced" Settings with this card.

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RS Liberty - Because WRX's are only good for parts...