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P4 640 to 670 (Wont go to 3.8)

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March 22, 2010 3:03:20 PM

I have a IBM Thinkcenter that a bought from school. Anyway, it had a P4 640 3.2, but I have a 670 3.8 that I decided to put in. For some reason it just sits at 2.79GHz. I flashed the BIOS.....I have no idea why it wont go to 3.8.
Any ideas?

Thanx

http://img404.imageshack.us/img404/1796/cpuid.png

More about : 640 670 wont

a c 131 à CPUs
March 22, 2010 6:03:35 PM

199.6 x 14 = 3.794.4GHz ~ 3.8GHz

The first number is the base clock and the second number is the multiplier. The CPU speed is the multiplier times the base clock. 199.6MHz is within variation. It also varies. Mine is varying from 199.9 to 201.7 as we speak. 0.0006GHz honestly makes zero difference.
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March 22, 2010 6:13:06 PM


199.6 x 14 = 3.794.4GHz ~ 3.8GHz
? Wrong
199.6 x 14=2787.4

Anyway, why wont the CPU run at 3.8?
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March 22, 2010 7:04:30 PM

1: The motherboard on that computer may not support the high multiplier of that CPU. Check the manufacturer's website.

2: The computer may have some sort of power saving features enabled, check in the bios and the power options control panel in your system to see if it is set to "power saver". If it is on, the computer might scale the multiplier down to 14 instead of the rated 19 to save power.


Cheers!
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a c 113 à CPUs
March 23, 2010 1:31:36 AM

the shoe said:
199.6 x 14 = 3.794.4GHz ~ 3.8GHz
? Wrong
199.6 x 14=2787.4

Anyway, why wont the CPU run at 3.8?

A few years ago I bought a Compaq ML110 G2 motherboard because the owner had a similar problem. His new 3.6 GHz CPU would only run at 2.8 GHz which happens to be the default speed when a CPU is not recognized. I'm currently using it with a 3.2 GHz CPU that's officially supported. The maximum is 3.4 GHz and that's probably the same with your system.
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