Hi all, I have a question here really need your pros answers.

I would like to know how inaccurate is CPU-Z or maybe some other reason that cause my below issue.

My BIOS setting was, core speed 2128MHz; x8mutiplier; bus speed 266MHz, other setting in BIOS were all auto.

But the CPU-z was showing core speed 1600MHz; x6multiplier; bus speed 266MHz.

My rig for your info,
Processor : E6420
Mobo : GA-P35-DS3R rev2
Memory : 2GB Mushkin Value Ram
GPU : Winfast 8600GT
PSU : Enermax FMA2 535W

Your helpful answer will be highly appreciated, TY.