I need to find out a processor(either Intel or AMD) with enough frequency levels

[mrle]

Hi,the model is Intel(R) Xeon(R) CPU X5472 @ 3.00GHz. Oh, so you mean in the MSR documentation, the 'reserved' field is also useful but is confidential?That's bad....
And following is what I get from c2ctl:
Current Target Min. Max.
FID 6 6 71 71
VID 22 22 34 34
ESIT_ENABLE = TRUE ESIT_LOCK = TRUE

That Xeon is a Harpertown, which is based on Penryn Core 2 arch. Unfortunately, it has a high FSB of 400 and low max multiplier of 7.5, so you'll just be able to set it to 6 - 7.5. The values from c2ctl are ok for VID (1.075-1.225 volts) but max FID looks off - maybe c2ctl cannot decode half-multipliers correctly.

I don't know why that stuff is considered confidential, as I'm sure there has to be some sort of BIOS developer guide that Intel provides to their partners. Could be that some licensing issues are involved...? :hmm:

Last question. You have said " Either way, all Ivy Bridge cpus are definitely unlocked from at least 16x to nominal". Does that mean if the cpu is 3GHz at nominal, we definitely will have 1.6,1.7,1.8.....3GHz frequency achievable. If so, my concern will be solved since I just need enough frequency levels.

With Ivy Bridge cpu yes, that's certainly possible. With Sandy Bridge too. Probably also with Nehalem. But with your current Xeon no.

 

[hshen1]

That Xeon is a Harpertown, which is based on Penryn Core 2 arch. Unfortunately, it has a high FSB of 400 and low max multiplier of 7.5, so you'll just be able to set it to 6 - 7.5. The values from c2ctl are ok for VID (1.075-1.225 volts) but max FID looks off - maybe c2ctl cannot decode half-multipliers correctly.

I don't know why that stuff is considered confidential, as I'm sure there has to be some sort of BIOS developer guide that Intel provides to their partners. Could be that some licensing issues are involved...? :hmm:



With Ivy Bridge cpu yes, that's certainly possible. With Sandy Bridge too. Probably also with Nehalem. But with your current Xeon no.

I see. Thanks a lot

 

[hshen1]

What I mean is, you can positively adjust the voltage up to +1V from whatever the CPU requests based on its voltage table. At 45x this would probably result in a voltage close to 2.2V.

I suspect my compy might crash if I lowered the multiplier down to 1x, but I may try it tomorrow (have a game server open right now that I can't offline). It *can* theoretically be requested.

(my original question has been posted as a new thread(about the voltage support for overclocking). I can not delete this post:< )