Kentsfield trick for high FSB benching

For those of you who have a Kentsfield and want to test high FSB you can disable corew three and four to reach the highest bus speeds possible on your motherboard.

I wanted my bandwidth back and dropped to one core and went for 500FSB and it booted, then enabled core two and the system booted into windows fine.

This will improve scores that dont take advantage of four cores/threads with the maximum FSB being possible as well as a small increase in the top speed of the chip when running only two cores. I cannot confirm that all systems will work as described above, I am on an 680i board by EVGA that will go past 500 with ease.

This is for benching and for those who want to try it.

interesting... not much use for 3dmark06 with 2 cores disabled ?

Nope, but the other products run fine.

I have a bunch of scores saved up now from being unable to post, hope they get the orb fixed soon.

FUGGER, what BIOS are you using ? P20/P21 with Qx6700 B1 remained at low bandwidth and low FSB limit with core 2 and 3 disabled, even if Windows reported only 2 active cores.

Bios 23? 12/16/06

I fired up for a screen shot, B3 chip.

There was no P23 out when i had the Qx6700's :)

One stupid question, can commando disable 2 cores from bos, if not how to do it?
@FUGGER
Can you answer to my pm, from couple days:)

Disable either in bios or msconfig

Not sure about commando. Ill look back for your PM.

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Originally Posted by Spacemaster

One stupid question, can commando disable 2 cores from bos, if not how to do it?
@FUGGER
Can you answer to my pm, from couple days:)

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Yes it can

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Originally Posted by Drag

Yes it can

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I will play with commando and X3220 at wednesday, so thanks for info.:toast:

Wow nice info.. Funny as i remember lookin at that option going why would one want to dissable some of the cores?? lol.. This is why! Cool.. Cant wait to get a chance to check this out.. Thanks man for the info!

I've already added a link to this at evga's forums.. Nice find!

whats the temperature difference?

Quote:

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Originally Posted by kiwi

Disable either in bios or msconfig

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I have two motherboards each with Its own QX6700 cpu, One is an Asus P5W DHD and the other is an Abit AW9D-MAX and I don't know of any way to disable any core of a cpu. If It exists I'd love to know where. :D

run>msconfig>bootini>advanced>numproc=

Quote:

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Originally Posted by JokerCPoC

I have two motherboards each with Its own QX6700 cpu, One is an Asus P5W DHD and the other is an Abit AW9D-MAX and I don't know of any way to disable any core of a cpu. If It exists I'd love to know where. :D

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From BIOS, only Intel 975XBX/2 and the 680i reference boards (eVGA, BFG etc) have the option to disable cores.