If your wanting higher performance in Half-Life 2 or other DX9 games, I would certainly reccomend returning your FX 5600 card and getting a Radeon 9600 Pro instead. It will be faster, ALOT faster. I promise. No, it won't be faster in Quake 3, or UT2K3 which both of those cards will run fine, but if you want high performance in upcoming Titles and the already on-the-shelf Tombraider 4 game, you'd better switch, NOW while you have the chance. I'm dead serious. IF you don't beleive me, we can link you some Tombraider 4 benchmarks just to show you how Nvidia will rip you off with theri FX line. We were all astounded & left speechless by how poor the Tombraider benchmarks results left. What it did leave though was a very poor impression on Nvidia's current crop of products. If your a Die-hard Nvidia fanatic either buy an NV40 board this Christmas, or get a Ti4200 if your value-conscious like me. Otherwise, the current Hi-end & Mid-range products gets mopped up by ATi products.
My OS features preemptive multitasking, a fully interactive command line, & support for 640K of RAM!