I've got a 740 that is limited to 2.64Ghz, no matter what voltage I push through it. The FSB is limited to around 220Mhz as well, no matter what multiplier or vAGP I use. Clockgen doesn't help.
Seems like too much of a coincidence to me, that MOST chips are limited to around the 2.6Ghz area.
My chip is an OEM from a Dell Inspiron 9300, I have a feeling that Retail chips are less likely to be 'locked'?
Running on droop modded P4C800-E 1024 beta and Zalman 7000Cu.