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P4 apparently underclocking

Trish's Escape from Hardware Hell Help Board » Hardware » Motherboard / CPU Related » P4 apparently underclocking « Previous Next »

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Posted on Thursday, March 20, 2003 - 5:01 am:   

I have a 2.53GHz P4 on a P4S5A motherboard with 256MB PC2700, running Windows XP. If I right click "My Computer" and choose properties, I can see my CPU is "Pentium(R)4 CPU 2.53GHz". On the next line, a line I have been told elsewhere is the actual processor speed, it says, without any title or caption, "1.89 GHz".

Also I have noticed that when I reboot the system, the black and white boot screen says Pentium 4 1.9 GHz or similar, (disappears quickly).

I have never overclocked it, (wouldn't know how), searching this board I found a couple of threads that dealt with older type boards where you could set the speed, but my board doesn't seem to have any of these options.

Apart from a real funny where it crashed during a Windows Update session and managed to switch the hard drive off in the BIOS, the system has been and is running fine.


Am I underclocking?

How do I fix it?

How could it have happened?
Posted on Thursday, March 20, 2003 - 9:59 pm:   

Yes you are underclocking, you should find a setting to up the front side buss to 133 MHZ, right now it is running at 100 heres the math 100 FSB multiplied by the locked multiplier at 19=1900 or 1.9 GHZ with a front side buss of 133 and the same locked multiplier gives you 2527 mhz or as close to 2.53 GHZ as you can get.
Posted on Friday, March 21, 2003 - 12:23 am:   

The BIOS option in the section CPU/DRAM Speed are

100/100 <--- as now
133/133 <--- this one you reckon?
Posted on Friday, March 21, 2003 - 8:24 am:   

133/133 would be correct if you have pc133 or ddr266 memory
Posted on Friday, March 21, 2003 - 8:27 am:   

I have the same board layout but with the VIA P4X266A chipset. It isn't the fastest but it is stabile.
Posted on Friday, March 21, 2003 - 8:29 am:   

If you have DDR333 memory you should set it at 133/166. Gives better memory performance. Which the P4 really needs.
Posted on Friday, March 21, 2003 - 1:12 pm:   

Hi ES,

I tried 133/133 and it seemed to work fine. 133/166 also seems to work. I'm going to leave it on 133/166 for a soak and make sure it is stable. Certainly the performance monitor I used, ( ), shows an improvement. With...

100/100 173/404.7MFlops
133/133 217/534.4MFlops
133/166 221/545.8MFlops

... I have seti@home running full time so I'm pushing the CPU/Mem the whole time, I'll see if my number of units increases over a few days

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