Sorry my bad
I'm not sure about 2900 Pro to v8600. FireGl cards natively don't have Crossfire so the modded cards won't.
1) Go here -->http://www.newdisk.cn/?wesley8
2) Click on ATI mod, pick New 2900xt Oct '07, download.
2) Unzip/Install driver just like any...
The new drivers off the Korean site added nearly 60 points to my specviewperf score!!!!!! (v8600 mod)
For those who got the v8600 mod to work and have dual monitors were there any problems or glitches with the monitors like with v7350 mod?