I just looked at your CPU and it is relatively slow for doing CPU intensive tasks like rendering.
Passmark rates it at 1500marks. PassMark - AMD Athlon 64 X2 Dual Core 5600+ - Price performance comparison
Earlier this year I sold my friend my i7 870, mobo, and ram to replace his aging pentium 4 3.4ghz Dell.
He does transcoding with the machine converting xvid to iPod compatible mp4.
The pentium took an hour and 15 minutes to convert a 43minute show.
After I setup the i7 for him we tested it with a 1 hour and 10 minute xvid and it took 8 minutes to transcode.
He was a very happy camper.