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CPU multiplier randomly drops under full load.

post #1 of 7
Thread Starter 
I found that the reason why my CPU and GPU drops have been happening. I won't explain anymore as most of you guys on the forum have seen my 5 or 6 posts about this issue. My multipliers will go from x17.5 to x4, leaving me at 800 mhz during the drops. The multiplier eventually does go back up, and that's when the fps/usage drops end(for some time). On more demanding games such a BO and WaW they happen longer, are more often, and much worse. The very odd thing about this happening is that this ONLY happens under full load. As if I had the opposite of cool & quiet on. If cool & quiet was stuck on at idle the multipliers would drop then when the cpu needs to work it would jump up. I know for sure that at this point the issue is not:
-overheating
-driver related
-software related(happened after fresh installation of windows)
-virus
-bad hardware
-game settings

I have turned off cool & quiet in the BIOS. I'm starting to believe that C&Q is staying on, even though it says off in the BIOS. I've tried a few things in the BIOS:
-overclocking
-underclocking(is this a word?)
-turning off cool and quiet

Specs:
-AMD 965 BE
-ASUS M4N68 T-M-V2
-nVidia GTX 460 1GB
-4GB
I feel like I'm forgetting specs, post if I am. Feel like something is missing >.<<br /> Also if something is wrong in here I am sorry, this was copy & pasted off of TTG
post #2 of 7
If your familiar with a program called K10Stat, it might help with your issue.

I've seen and experienced the problem you describe, and it appears to be the PC changing into another power state. It happens even when "thermal controls" are disabled (Q&C, C1E). Basically, you can edit the Pstates, and manually force the PC to run at 100% all the time. This prevents it from happening on my system.

I've yet to gain any understanding as to why it's happening. It seems to happen regardless of whether the system is overclocked or not.

K10stat can be a bit tricky to use, but there are tutorials online.
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post #3 of 7
Its probably the VRM's heating up a bit. Basically some of the lower end boards dont have the best power delivery systems. This usually causes the VRM's to heat up a lot and causes throttling.
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Intel i5 3570K ASRock Z77 OC Formula Nvidia Zotac GTX 770 Gskill Trident 2400 Mhz 
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Samsung 840  OCZ Vertex 2 Seagate 7200 Windows 8 
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E IV
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 3570K ASRock Z77 OC Formula Nvidia Zotac GTX 770 Gskill Trident 2400 Mhz 
Hard DriveHard DriveHard DriveOS
Samsung 840  OCZ Vertex 2 Seagate 7200 Windows 8 
MonitorKeyboardPowerCase
22" Benq Logitech Antec HCP 850W Caselabs SM8 
MouseMouse PadAudioAudio
Logitech G400 Razer Asus Xonar DGX Microlabs C Series 
  hide details  
Reply
post #4 of 7

If you disable both CnQ and C1E there should be no controlled reason why the CPU is throttling.

 

The issue is the VRMs.  The 4-phase VRM design (based on an old AM2 design and not so optimized for AM3 processors that normally make use of the split +1 or +2 phase to provide a separate NB voltage/output) in the M4N68T-M V2 doesn't have a very good track record attempting to push 125W processors and over-current-protection based throttling is common in order to deal with VRM overload and overheat and prevent failures.  You can expect to have performance issues until you upgrade to a board with better VRM capacity.

 

Look to a new board with better VRM capacity - going from 4-phase to a proper AM3-enabled 4+1 with the split +1 phase for the NB can make a big difference.  Ensure that the VRMs are cooled - through-airflow from the stock CPU cooler can provide this.

 

If you don't have money for a new board (yet), consider a big undervolt - and an underclock as necessary to maintain stability.  It's better to get the constant performance of 2.6Ghz with a significant undervolt than to have 3.4Ghz sometimes and 800Mhz sometimes.

 

You can read more about the issues on VRMs and why to pay attention to these issues through the link in my sig (About VRMs & MOSFETs) - there've been worse cases in which VRM overload (i.e. not enough capacity to provide the power) have caught fire.... none on the ASUS brand though, due to the presence of over-current protection.


Edited by xd_1771 - 2/3/12 at 12:18am
post #5 of 7
Thread Starter 
Send me a link to a tut or something?
post #6 of 7
Thread Starter 
I have never had this issue before.
post #7 of 7

Read through the link in my sig: About VRMs & MOSFETs.

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