Is it worth it? I don't know what exactly the issue is, but my HTPC seems to lag at times while playing back MKVs. I believe the latest ffdshow supports DXVA now, so I'm guessing a faster GPU may help.
Other system specs are E6600, P5N-E SLI, 2x1GB Corsair Dominators DDR2-800, Antec EarthWatts 380, and Intel Gigabit CT NIC running Windows 7 32bit. I don't see why I have such problems though, unless it's the crappy NVIDIA chipset?
Comparatively, my AMD Athlon X2 4400+ (s939), 3GB of DDR400, HD4350, and onboard Marvell LAN has no troubles at all. Codec setup is identical.