different HTT value reported by different devices?

[jealouse]

greetings!

I'm running A3700+ on Asus A8N-VM CSM, which is a microATX MO and has a lone overclocking option of HTT adjustment from 200 to 240MHz in 1MHz increments.

1. I set HTT at 219. Therefore, CPU clock should be (219*11=) 2409MHz.

2. However, CPU report tool in BIOS menu reports CPU clock to be (221*11=) 2431, even though HTT is set to be 219 in the same BIOS.

3. Once XP is booted up, XP reports the CPU clock to be 2.42GHz. Running CPU-Z reports HTT to be 220MHz, with CPU at 2420(=220*11), confirming what XP reports.

I know the difference is miniscule but it's there nevertheless. Can someone explain why this is so and which value should be trusted?

Thanks in advance

 

[krotchy]

I have found that sometimes the motherboard doesnt divide your clock to exactly what you pick, but it attempts to find the closest match. One example, although less extreme is that my mobo takes 266 and 267 to mean exactly 266 and 2/3 mhz. In general my motherboard is only accurate to 1.666 mhz, and increments accordingly, despite showing 1 mhz accuracy in the bios. This is likely your problem.