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i5 2500k idles at max frequency but drops to 800 Mhz under load

post #1 of 14
Thread Starter 
I did a quick search and haven't found anyone with this problem:

I built a rig late last summer but haven't had the opportunity to use it until now. Now that I've had the opportunity, I found that it's not running as well as expected, so I ran CPU-Z and discovered that when idle the CPU runs at maximum frequency (originally 4.0 GHz overclocked, now at stock because I don't want to overheat it due to constant max usage). Further, I opened a game and found that in processor-heavy situations the frequency drops to 800MHz (Occasionally only drops to 1.6 GHz), causing extreme lag. Other games and OCCT testing yielded the same results. BIOS settings are now all on default.

Please let me know if any other information is required; this is my first time ever posting on a forum. I'd really like to get this resolved, as right now my laptop with integrated graphics outperforms my desktop when I dare to boot it up and test it.
post #2 of 14
What are the temperatures & voltage on load? Run HwMonitor or RealTemp

It's probably throttling due to overheating.
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post #3 of 14
Quote:
Originally Posted by AlphaC View Post

What are the temperatures & voltage on load? Run HwMonitor or RealTemp

It's probably throttling due to overheating.

That was my first guess.
 
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post #4 of 14
Thread Starter 
You're right, it's definitely running hot. It also sounds reasonable that it's throttling because of heat. I should probably invest in a better heatsink.

Without load: EDIT: It should also be noted this was only about 2 minutes after being turned on, so it hadn't been running at 3600 MHz for a long time.


With (before I cut it off):

(Sorry if I'm not formatting the pictures correctly)

I'm really concerned about the fact that it's staying at such a high frequency, because it's supposed to be using speedstep and should be at around 1600 MHz when idle, I thought.
Edited by smartAlex - 3/29/13 at 7:14pm
post #5 of 14
It might be a good idea to reapply some thermal paste, re-seat the heatsink/cpu block and use the air can to get the dust out between the fins.
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post #6 of 14
Thread Starter 
Excellent! I played around with the heatsink a little and got it to sit firmly for a while. Unfortunately, it won't stay seated for long. I don't know if the problem is with the MB or the stock heatsink, but one of the legs managed to wiggle loose again after about 20 minutes. Are Z75 boards or 2500k stock heatsinks known for having loose heatsink connections? Is there a way to tighten the connections up at all?

Anyway, temperatures are down in the low 30s celsius now. Should I even worry about Speedstep not kicking in, now that I seem to be at a reasonable temperature even at high frequencies (as long as the heatsink is actually seated correctly)? Also, should I trust CPU-Z's constant 3600 MHz frequency reading or RealTemp's ~2780 MHz reading?
post #7 of 14
Good to hear that you are getting low temps now. If your using the stock cooler, they don't necessarily clip in all the well/easy. It take a bit of time to learn to get it right.

I use CPU-Z reading over realtemp.
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post #8 of 14
Quote:
Originally Posted by intekmdma View Post

Good to hear that you are getting low temps now. If your using the stock cooler, they don't necessarily clip in all the well/easy. It take a bit of time to learn to get it right.

I use CPU-Z reading over realtemp.

Realtemp is for reading temps, not frequency. OP, run CPUz under load and see how your frequency scales.


EDIT: Actually read some more of the posts. Your chip is behaving properly now OP?
 
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post #9 of 14
Quote:
Originally Posted by Lord Xeb View Post

Realtemp is for reading temps, not frequency. OP, run CPUz under load and see how your frequency scales.


EDIT: Actually read some more of the posts. Your chip is behaving properly now OP?

I think your directing this to me since I've been quoted:

Yes, the OP asked a question and I answered it. I use CPU-Z to read clock speed.
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post #10 of 14
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CPUMotherboardGraphicsRAM
Core i5 750 3.99 (190x21) 1.376v Load ASUS P7P55d-E Pro GTX 670 FTW <- Poor overclocker :( 8GB (4x2GB) G.Skill DDR3 1600 
Hard DriveHard DriveOptical DriveOS
Samsung 830 Evo 128GB 2x 2TB  Some DVD drive OSX 10.10.4 
MonitorPowerCaseMouse
Asus 1080P Crap TX 750 HAF 922 G400s 
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Gsvlip Dudyrm
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Oda'maksv
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CPUMotherboardGraphicsRAM
3770k @ 4.5 1.312 load Zotac Z77 ITX Wifi GTX 1070 Gaming 2126/2249 w/ Hybrid cooler TridentX 16GB 2400MHz 
Hard DriveHard DriveCoolingCooling
Samsung 850 Pro 1TB Seagate 2TB H105 EVGA Hybrid GPU cooler 
OSMonitorKeyboardPower
Windows 10 Asus MG279Q - 24" 144Hz 1080p Filco Majestic II w/ Cherry Reds Seasonic X 760W 
CaseMouseMouse PadAudio
Bitfelix Prodigy Logitech G400 Razer Goliath AKG A701 
AudioAudio
JDS Labs Objective 2 JDS Labs ODAC 
CPUMotherboardGraphicsRAM
Core i5 750 3.99 (190x21) 1.376v Load ASUS P7P55d-E Pro GTX 670 FTW <- Poor overclocker :( 8GB (4x2GB) G.Skill DDR3 1600 
Hard DriveHard DriveOptical DriveOS
Samsung 830 Evo 128GB 2x 2TB  Some DVD drive OSX 10.10.4 
MonitorPowerCaseMouse
Asus 1080P Crap TX 750 HAF 922 G400s 
Mouse PadOther
Apple Keyboard Xbox One controler 
CPURAMHard DriveHard Drive
C2D 2,26GHz under volted @ .978v 8GB  Crucial M4 64GB SSD 500GB Scorpio Black 
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