If you’re already gaming with a G92-based 8800 GTS, there’s very little reason to move up to a G92-based 9800 GTX such as PNY’s XLR8. The architecture in both GPUs is nearly the same, with 128 stream processors, a 256-bit interface, and 512MB of GDDR3. Slightly faster clock speeds yield only a modest bump in performance. That’s not to say the 9800 brings nothing to the table, but you’ll have to decide for yourself whether its offerings are worth the price.
Compared to AMD’s gracefully engineered Radeon 3870 X2, Nvidia’s GeForce 9800 GX2 (represented here by Gigabyte’s implementation) is something of a kludge. But when we consider the performance that Nvidia’s design delivers, it’s hard to complain about elegance.