OC'ing a non production P4

I'll beat you guys to the punch, I'm admittedly a n00b to the dark gaming/OC'ing underbelly of the PC world. I recently bought a p4 2.6 800fsb off of acmicro.com ($198). I installed the CPU only to find that winXP was detecting it as 1.6 Ghz with a 800fsb. I ran an Intel processor ID tool and says that the CPU is a non production processor. I called the vendor and he says that I have to modify my a setting (forget the name) in my bios to 12x. Once I do this, XP detects it as 2.6 and the intel utility detects it as 2.6ghz w/ 800fsb but still as a non-production processor. Was I just jooped into buying a 1.6 at a 2.6 price and then manipulated into overclocking it so I think that I really got a 2.6? Or does what I did have anything to do with overclocking? If I didn't overclock it how can I? Has anyone ever heard of a non-production P4 being sold without disclosing such?

I have a 9800pro, d865perl Mobo, 2 512 kingston pc3200 400mz sticks, 5 80mm fans, antec 350w PS. The system keeps crashing during games (or the video goes out) and I can't help but feel that it's this non production CPU. any advice? Also how can I run some benchmark tests on my system to see if I am getting the right performance out of it?