Complete review can be found at:
http://www.tomshardware.com/2006/12/...ney/index.html

Don't spend any more than 200 on an AGP, you'd be much happier with a PCI-e...

Best card for under $100:GeForce 6600Radeon X700
Best AGP Card For ~$140:Radeon X850 PRO
Best AGP Card For ~$185:GeForce 7600 GT

and, to my knowledge, the RX850 has 12 memory pipelines from the factory, but can be unlocked to 16 with a bios flash, so just get one at best buy, and exchange it till you get one that it works on...