While the performance of the Inno3D GeForce 9800 GTX Overclocked and the GeForce 9800 GTX in general is impressive, particularly for a $300 US graphics card, it is not exactly a huge leap forward when compared to the GeForce 8800 series. Although GeForce 8800 GT owners would see reasonable performance gains if they were to upgrade to the 9800 GTX, overclocking the 8800 GT would deliver a similar affect.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips