|All AXP 2000+ CPUs run at 1.67GHz (12.5 x 133MHz) but there are several different versions of the AXP 2600+ & they all run at different speeds. Are you 100% sure the CPU you sold was the AXDA2600DKV4D? That CPU is supposed to run at 1.92GHz (11.5 x 166MHz), so even if the CPU frequency was set incorrectly in the BIOS, it would run at 1.53GHz & be recognized as 1800+. |
My guess is you sold an AXDA2600DKV3D which is supposed to run at 2.08GHz (12.5 x 166MHz). Notice that this CPU has the same 12.5x mutiplier as the 2000+, so if the CPU frequency is set at 133MHz instead of 166MHz, it would be recognized as a 2000+.
The problem may be that the frequency is set incorrectly but it's also possible that the buyers motherboard doesn't support CPUs that run at 166MHz (333MHz FSB).