ΟΚ here is a problem I want your help . . .

I'm building a new PC for a friend with the following components :
M/B--->Gigabyte P4 Titan GA-8S648
CPU--->Intel P4 2.8 with 800 FSB
RAM--->2X256 MB DDR 266 Mh

the problem is that the BIOS with the 'Linear Frequency Control' option turned to 'Enable' recognises the CPU as 1.86 (133X14)
When I disabled this option and I tryed to manually set the frequency the compute freezes in the windows welcome screen :(
I know that the M/B and the CPU are in perfect contition because I have two sets and I have tryed with both of them with the same result....
Help :(