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May 2, 2009
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OK, So I had Windows 7 a few months back. I had this problem, and forgot that its why I went back to vista.

basically, ive been on Vista 64 bus for the last 2 months. Havent changed my computers settings at all bios wise. So under windows vista my clock settings are:
(motherboard DFI x58 and proc i7 920)

1.36v vcore
1.36v vtt
195x21x = 4.1ghz
1950mhz ram
195 BCLK

Every day I went into vista, and my clocks stayed at 4.1 ghz. i could 8 core prime, no problem, watching CPU-Z it never changed.

now I just decided to try RC1 vista, and am in windows and I see this instead....

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Now, I will go through what I have checked.

1.) power profile. I have tried High performance and also built a custom one. no go.
2.) I rechecked my bios settings, I even booted into my old vista install as its on another disk and settings are fine and 4.1 runs flawlessly.
3.) when i boot, my post screen shows 195x20 = 4.0ghz. When I get into windows it becomes a completely different story.
4.) I have disabled C1E state completely. It should not be throttling down, as it is disabled on the hardware level?
5.) I had to leave EIST enabled, as thats the only way turbo will work 24/7.
6.) if I disable EIST, and boot into windows, I will get 195x20x = 3.95Ghz.
7.) if I leave my PC at stock settings say 133x21 w/ stock voltages and go into windows 7 it will do 21x.
8.) ive ran benchmarks that show my performance is really at that low of a level w/ 12x multipler, so it is not a CPU-Z issue :)

So those are the facts I have figured out on my own. For some reason it appears windows 7 throttles down my overclock, like its not safe. " I dont like it when an OS goes big brother on me, and tells me, I dont think that overclock is safe, so you cant do it sorry, i am going to limit you to 195x12 = 2.4 ghz, have fun."

This has been an issue on all windows 7 installs ive done up to RC1 7100.

Anyone have any idea how I can nip this one in the butt? Anyone know what could cause this?


Id prefer not to mention this, but I did have the same exact brand board that I RMA'ed, and prior to the RMA, i remember hitting 4.1ghz in windows 7 on that board with similar settings. Now I know what you are thinking, well it must be the board then? Well how come I dont have this issue with windows Vista 64 then? So id prefer you ignore this, but I want to be as accurate as possible.

Sorry if this is information overload, Its just really irritating me, and I would like to see this one small issue I have with 7 disapear. (well big issue for me right now)
 


Solution
Work around for Turbo 21x issue fixed at 12x on DFI UT X58 when using Win7 Link Removed

FIXED idle and load 21x multi!

Change CxE from AUTO/Disabled to C1E + VID AUTO + VID Special ADD for adjusting vcore.

==================================================
CPU Feature
Set VR Current Limit Max: Enabled
Thermal Management Control: Disabled
EIST Function: Enabled
CxE Function: C1E
Execute Disable Bit: Disabled
Virtualization Technology: Disabled

***** Logical Processor Setting *****
Intel HT Technology: Enabled
Active Processor Cores: All

Voltage Setting
O.C. Shut Down Free: Disable O.C.S.D.F
CPU VID Control: AUTO
CPU VID Special Add Limit: Enabled...
Work around for Turbo 21x issue fixed at 12x on DFI UT X58 when using Win7 Link Removed

FIXED idle and load 21x multi!

Change CxE from AUTO/Disabled to C1E + VID AUTO + VID Special ADD for adjusting vcore.

==================================================
CPU Feature
Set VR Current Limit Max: Enabled
Thermal Management Control: Disabled
EIST Function: Enabled
CxE Function: C1E
Execute Disable Bit: Disabled
Virtualization Technology: Disabled

***** Logical Processor Setting *****
Intel HT Technology: Enabled
Active Processor Cores: All

Voltage Setting
O.C. Shut Down Free: Disable O.C.S.D.F
CPU VID Control: AUTO
CPU VID Special Add Limit: Enabled
CPU VID Special Add: 110.10%
Vcore Droop Control: Disabled

PPM Function: Enabled
Turbo Mode Function: Enabled
1 core Max Turbo Ratio: 22x
2 core Max Turbo Ratio: 21x
3 core Max Turbo Ratio: 21x
4 core Max Turbo Ratio: 21x
CPU Non-Turbo Clock Ratio: 20x

Link Removed due to 404 Error

Link Removed due to 404 Error

Max calculated and MSR multi = 21x under 3dmark06 load

Link Removed due to 404 Error
 


Solution
The above did not work for me. I set my bios exactly as you have it ( i am using a more recent bios then you tho (05/08) and i am still stuck at 12x. Double checked the power profile in windows 7 verified both minimum and max set to 100%. Still a no go.

I have a friend who is getting me a really good deal on a P6T deluxe V2, so I probably wont have my DFI board much longer. I was kind of hoping they would fix it, but its been almost 2 months, and its a no go :(
 


DFI has a new bios sometime this week apparently so the wait might be over. Shame you can't wait.

Anyway work around did help me with W3520 cpu

3dmark06 @21x215bclk - 4509Mhz

Link Removed due to 404 Error

3dmark05 @21x215bclk - 4509Mhz

Link Removed due to 404 Error

3dmark Vantage @21x215bclk - 4509Mhz

Link Removed due to 404 Error
 


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