Computing.Net - CPU running half speed

Subject: CPU running half speed - help

Original Message

Name: TDRILL
Date: September 22, 2007 at 14:19:00 Pacific
Subject: CPU running half speed - help
OS: XP
CPU/Ram: P4 / DDR
Model/Manufacturer: Custom

Comment:

I am putting an old P4 together. CPU reads at 1.3 GHz instead of 2.66 GHz. I have done some searching and found about the multiplier being wrong, but I can figure out how to change it. I have a jumperless mobo and can't find the right setting in the BIOS.
BIOS has FSB at 400 and RAM at 266. Should be 533 and 333. Option for 333 doesn't show up, just 266 and auto. I ran speed test and processor is truely running at 1.3 GHz.
Please help me with some suggestions on how to fix this. Mobo is Intel D845GEBV2. Thanks

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Response Number 1

Name: jam
Date: September 22, 2007 at 15:16:04 Pacific
Subject: CPU running half speed - help

Reply: (edit)

The CPU multi is locked & cannot be changed. However, the multi for a P4 2.66GHz/533FSB CPU is 20x...I don't see how it could be running at 1.3GHz? If the CPU frequency was set to 100MHz (aka 400MHz FSB), it would run at 2.0GHz, not 1.3.
Set the RAM at 133MHz (aka DDR266) & the CPU freq at 133Hz (aka 533MHz FSB). That way the CPU & RAM will run in sync, that is, 1:1 ratio.
Unless you don't actually have a P4/2.66GHz CPU? Try using CPU-Z to confirm what you have & what the settings are:
http://www.cpuid.com/cpuz.php
http://support.intel.com/design/mot...

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Response Number 2

Name: TDRILL
Date: September 22, 2007 at 15:44:15 Pacific
Subject: CPU running half speed - help

Reply: (edit)

Here are the results of CPU-Z:
Name: Intel Pentium 4
Code Name: Northwood
Package: Socket 478 mPGA
Technology: 0.13 um
Specification: Intel Pentium 4 CPU 2.60GHz
Core Speed:1300 MHz
Multiplier: x13.0
Bus Speed 100 MHz
Rated FSB 400 MHz

The RAM does show at DDR266. I do not see how to change CPU frequency.
BTW, here is the link to the Intel site for that board:
http://www.intel.com/support/mother...
I have already upgraded to that latest BIOS with no results.

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Response Number 3

Name: jam
Date: September 22, 2007 at 17:13:06 Pacific
Subject: CPU running half speed - help

Reply: (edit)

There you go...you don't have a 2.66GHz/533FSB CPU.
You have a 2.60GHz/800FSB CPU:
http://processorfinder.intel.com/de...
Since your motherboard doesn't support 800MHz FSB, it can only run the CPU at 400MHz or 533MHz FSB, meaning that the speed would be either 13 x 100MHz (1.3GHz) or 13 x 133MHz (1.73GHz). There's no way you can run that CPU at 2.60GHz with that motherboard.

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Response Number 4

Name: Cobra_R
Date: September 23, 2007 at 00:47:42 Pacific
Subject: CPU running half speed - help

Reply: (edit)

Go buy a decent socket 478 motherboard that supports 800mhz FSB. You can get a decent socket 478 motherboard dirt cheap now.

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Response Number 5

Name: Outlander
Date: September 29, 2007 at 14:31:55 Pacific
Subject: CPU running half speed - help

Reply: (edit)

If you have an option to, enter in 200MHZ for the FSB.
Stay away from Intel brand boards, Their chipsets are the best for stability, but they lock out a lot of features in their Bios.
Core2 Duo 1.86
1GB DDR2 667
Nvidia 8500GT
Asus P5L-MX

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