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CPU slow down on Prime95

post #1 of 7
Thread Starter 
I am having this motherboard too...but I run a 1090t on it. Is the HT link gonna affect the overclock ability?
I also wonder why the cpu speed slow down when I am running Prime95? It goes a full speed a while and automatically slow down. Sometimes go up and again, and then slow down again. Is it throttled by the mobo? How to turn it off?
Please help me....><
post #2 of 7
Thread Starter 
Hi,

I recently build a computer with 1090T and Asus M4n68T-M V2. I overclocked it to 3.9ghz and try to run Prime95. The CPU speed fluctuate between 1.6ghz to 3.9 ghz with unknown reason. BTW I have already turn off Turbo Core and Cool n Quiet. Does anyone know the reason of that and solution on that?

Please help and thank you for answering.
post #3 of 7
1. could be a poor heatsink mount.
2. Mosfets getting too hot
3. Thermal throttling
Yeyo
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Yeyo
(16 items)
 
Scarface PC pics
(47 photos)
 
CPUMotherboardGraphicsRAM
i7 3770k ASRock Extreme 4 Gen 3 EVGA 670FTW Gskill Sniper Low Voltage Series 1.25v 16GB 
Hard DriveOptical DriveCoolingOS
Intel 80GB G2- OCZ 60GB- 1TB Asus BD combo Megashadow Deluxe Edition  Win7 
MonitorPowerCaseAudio
40" Insignia  Seasonic X750w Sleeved red Corsair 500r White Asus Xonar DGX 
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post #4 of 7
New topics in new thread, please. EDIT: Merged threads, but please do not bump old posts.

Quote:
I also wonder why the cpu speed slow down when I am running Prime95? It goes a full speed a while and automatically slow down. Sometimes go up and again, and then slow down again. Is it throttled by the mobo? How to turn it off?
That's correct. This is because the VRMs are incapable of handling a 1090T and overload/overheat, causing this protective throttling feature. There is no way to turn it off; it is there for your system's and your protection. Throttling can happen via AMD's Cool'n'Quiet function (which can be disabled), however this happens when the CPU is IDLE and not loaded with Prime95; CnQ is irrelevant here. If you cannot swap motherboards (which I recommend you do), the best thing you can do is make use of the stock cooler (to cool the VRMs) if not already, and attempt undervolting.
post #5 of 7
Thread Starter 
For the poor heatsink mount...are you talking about the cpu one?
If it's the temperature, the highest cpu temperature I experience is about 51C only...and motherboard is 31c...is it inaccruate? I use HW monitor to check......
post #6 of 7
Thread Starter 
BTW do you have any mobo suggest which is below 100 USD?
post #7 of 7
i use asrock extreme3 gen3 which i got for $150 at newegg and you get the most features and ports for the price (2x PCIe 3.0!)
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