I'm no expert, but I thought the low wattage chip was simply a derated (voltage reduced) chip. Anyhow, here is some data from the AMD site:

http://www.amdcompare.com/us-en/desk...=ADD3800IAT5CU

Seems to run at the same frequency though. I know you don't get something for nothing, so there has to be a down side in there somewhere.

As far as where to buy, AMD offers this list:

http://shop.amd.com/us-en/products/3.aspx?sid=txtlnk

Good luck!