I have a FIC AD-11 socket A motherboard that runs 266 FSB. I was running an AMD Athlon 1.3 GHz (133 x 10) cpu, but while installing a different heatsink/fan I damaged the cpu and I'm going to replace it with a different one. This is an old system, and I was wondering if an AMD Duron Socket A 1.6 GHz would work in it. I don't want to overclock it, just wondering if the Duron would run at an underclocked 1.3 GHz (I think 10 is as high as the multipliers go in my BIOS). The reason I'm asking is b/c I found a Duron for $20 after rebate at TigerDirect.com, so naturally I'd like to repair my system cheaply.