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Core i7 970 - Multiplier drops under load

post #1 of 8
Thread Starter 
I've got what appears to be an unusual problem. I've only had this CPU a few days and have been gradually working up my overclocks.

At the moment I'm testing 180 x 25 (4.5GHz) at a vcore of 1.3875v and I've noticed that when I run P95 small FFT the multiplier drops from 25 to 24 and stays there dropping the CPU speed from 4.5GHz to 4.32GHz. However if I run the P95 Blend test, LinX or a rendering test the multiplier stays at 25. The temperatures haven't exceeded 60ºC so I don't think it's thermal throttling and the vcore isn't that high.

The multiplier still drops whether C1E and/or TM Support is enabled or disabled. After fitting the 970 a new BIOS option appeared for 'Performance/Watt select' but it doesn't matter which option from 'Traditional' or 'Power Optimizedis' is selected the multiplier still drops under load to 24 only when running P95 Small FFTs.

Is this a bug in the BIOS or is there something I've missed? As far as I can tell the RAM stays at the same speed of 1800MHz when the multiplier drops.
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post #2 of 8
Is EIST enabled? Intel Speed step...if it is disable.
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post #3 of 8
Thread Starter 
Speedstep is disabled.

I can't see an option to disable EIST.
Edited by Big Elf - 7/17/11 at 1:14am
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post #4 of 8
Eist is Speedstep, could be your Win7 power saving settings, But by disableing your C states and Speedstep, it should not be jumping...but check anyway, thats all I can think of...
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post #5 of 8
I was having this problem with my i5, changing the turbo boost power limit fixed it I think.
post #6 of 8
Thread Starter 
The only option I have which might be for turbo is the 'Performance/Watt select' but as I mention above it doesn't matter which option either 'Traditional' or 'Power Optimized' is selected.

I always have my Win 7 Power Options set to Maximum Performance and I'd double checked each setting earlier.

I've run benchmarks which confirms that it is running faster at 4.5GHz than 4.4GHz so I'm guessing it's some anomaly with Prime 95, CPU-Z or this particular motherboard that for some reason doesn't show the correct info when running small ffts. LinX puts it under more stress so I would have expected that to be affected as well.
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post #7 of 8
Hmm, I don't know? sheesh
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H.O.G
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Intel-x25V, X25M,WD Caviar Black 500 Asus DVD NH- D14 7 pro 
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post #8 of 8
Thread Starter 
I forgot to update this thread with the solution. It's apparently a 'feature' of the Asus P6T series that if the motherboard detects a high loading it will throttle by dropping the turbo boost multiplier.

If I drop the multiplier from 25 to 24 and increase the BCLK it will run fine at 4.5GHz (and higher) without throttling.

There's also a special BIOS 0006 which gives you the opportunity to disable the throttling http://www.xtremesystems.org/forums/...=1#post4487609

It was thanks to 'unclewebb', the author of Real Temp that I was able to get this solved. Intel were also pretty helpful without actually coming up with the reasons.

Asus were absolutely hopeless. You'd think they'd have some idea of how their motherboards operate but no, they kept insisting it was a problem with the stress testing software.
Black Noise
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i7 990X Asus Rampage III Extreme EVGA 980Ti EVGA 980Ti 
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24GB Corsair Dominator GT PC3-16000 Samsung 850 EVO Crucial CT750MX300 Seagate Momentus 2TB 
Hard DriveOptical DriveCoolingCooling
Seagate Momentus 2TB Sony Optiarc AD-7690H Slimline DVD-RW Blocks - EK Supremacy, 2 x EK FC-Titan X, EK FC... Radiators - 2 x Black Ice SR1 480, 2 x Black Ic... 
CoolingCoolingCoolingOS
Pumps - Swiftech 35X2 x 2 & Heatsinks Reservoir - EK Multioption X2 400 Advanced Fans - 20 x Noiseblocker PL2 Windows 7 Pro 64-bit 
MonitorKeyboardPowerCase
NEC MultiSync LCD2690WUXi Enermax Aurora Seasonic Platinum 1000 Case Labs TH10 & Pedestal 
  hide details  
Reply
Black Noise
(22 items)
 
  
CPUMotherboardGraphicsGraphics
i7 990X Asus Rampage III Extreme EVGA 980Ti EVGA 980Ti 
RAMHard DriveHard DriveHard Drive
24GB Corsair Dominator GT PC3-16000 Samsung 850 EVO Crucial CT750MX300 Seagate Momentus 2TB 
Hard DriveOptical DriveCoolingCooling
Seagate Momentus 2TB Sony Optiarc AD-7690H Slimline DVD-RW Blocks - EK Supremacy, 2 x EK FC-Titan X, EK FC... Radiators - 2 x Black Ice SR1 480, 2 x Black Ic... 
CoolingCoolingCoolingOS
Pumps - Swiftech 35X2 x 2 & Heatsinks Reservoir - EK Multioption X2 400 Advanced Fans - 20 x Noiseblocker PL2 Windows 7 Pro 64-bit 
MonitorKeyboardPowerCase
NEC MultiSync LCD2690WUXi Enermax Aurora Seasonic Platinum 1000 Case Labs TH10 & Pedestal 
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