Summary: I'm a little disappointed, I thought that this chip would fit on a socket 939 board, but no way! Had to buy another chip because I was trying to avoid buying what would amount to a bare bones kit. Better read the fine print next time.
Summary: The Athlon 64 x2 processor (Used) was in excellent shape. It was well packaged and I found it was cleaned, basically ready to go. Great care was taken in its packaging. Plugged in and applied heat sinc compound with new cooling fan and it is running at peak perfomance.
Summary: I bought this for because my processor was failing. shipping was fast and was safely arrived to my house. For a used CPU it was AWSOME!!! It was a really good upgrade from my failing CPU (Athlon 64 x2 5000+). Take care in mind that this is a WINDSOR CPU and check to make shure your pc is compatible. over all, best used product I've ever bought! Runs cool with my new heatsink/fan (30 to 35 C on idle).
Summary: I swapped out the stock AMD Athlon 64 X2 3800+ for this 5600+. My Win 7 WEI jumped from a 4.7 score for my CPU to a 5.9. This also boosted my RAM WEI from 4.7 to 6.4. My E521 really performs much faster overall. I uninstalled iTunes and all my music files, reinstalled fresh iTunes and added the music files back. iTunes really, really performed much much better. The MP3 to AAC file conversion was truly rapid.