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Different CPU Temps from standing case and lying case

post #1 of 7
Thread Starter 
I have a strange situation.

(for reference - CPU core i7 930 @ 3.5 GHz bclk 160 multi x22 1.24V, HT and speed step is on, system is 100% stable, lots of good air flow and little dust (recently cleaned inside the case))

When my case is in its normal position standing up (vertical) my CPU temps at 100% load are 100c and thermal throttling occurs multi goes all the way down to 16!!! and 2.56 GHz ~ 30% slower than my oc!!! idle temps are ok @ 46c - 50c.

After looking and seeing most people are getting ~70c at 100% load I was thinking the HSF wasn't making good contact with CPU and in the past I have reseated it several times with the same problem occuring. I haven't been too concerned as during gaming temps only reach 65c - 70c (not 100% load). But now I'm doing more video transcoding and 100c is worrying me!!!

I recently thought to lie my case on its side (horizontal) thinking this would remove the rotational force exerted by my rather large Zlaman 9900 HSF. I did this last night and my CPU temps dropped rapidly and now at 100% load temps are 63c - 69c from core 3 - 0 and 3.5GHz with no thermal throttling .

But I don't want to lie my case on it's side it's not practical for me.

My 2 questions I ask is. How can I get the same CPU Temps <70c while the case is standing up? and why is there such a spread of temps accross the cores, how can i reduce this?

Any help, ideas and suggestions greatly appreciated, thanks in advance.
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post #2 of 7
Id say the heatsink isnt bolted down very well, does that HS use push pins? Because sone might be disconnected, and the hradsink base might be leaning off of the core die when its standing, but then itll sit back down fully on it when its on its side
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The Desert Fox
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post #3 of 7
Thread Starter 
Thats what I was thinking but it's screwed down with 4 screws in the corners of a plate that surrounds the bottom of the HSF. I never use push pins. The screws are tight and the HSF is tight and doesn't move or twist. Its is a big HSF, 94(L) x 131(W) x 152(H) mm and 730g of copper. I could try adjusting the plate that secures the HSF but don't want to over pressure the CPU and socket.

http://www.zalman.co.kr/ENG/product/...ad.asp?idx=356
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Intel Core i7 930 @ 3.5 GHz Asus P6X58D-E EVGA GTX 470 675c 1800m 1350s Corsair Dominator DDR3 1600 MHz 
Hard DriveOptical DriveOSMonitor
Western Digital WD5002AALX Asus DVD-RW Windows 7 Ultimate 64bit Samsung SyncMaster T220 
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Hard DriveOptical DriveOSMonitor
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post #4 of 7
That cooler looks like a coral reef.

On-topic: I noticed the same with my previous, previous, previous (...) case. It became much cooler and quieter when it was lying down and I can not figure out why.

Reseating it might help?
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derp
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post #5 of 7
Your temps should not hit 100 under full load.Something isn't right.The huge temp difference in cores is usually related to an uneven tim application.
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post #6 of 7
Thread Starter 
@ taintedmind

Yeh it looks awesome all lit up in Blue . The whole pain of gravity. I guess I'll be reseating it later today not so confident it will make a difference but I'll try a different technique for applying the thermal compound.

@ djsi38t

I know 100c bad!! but it only happens when the case it standing up the CPU is under 100% load. right now with the case on its side its 69c 68c 66c 64c across cores 0-3 according to core temp. If i remember last time i applied the thermal compound I was sure it was fairly even.

could the temp variation have something to do with the layout of the die eg core, cache and memory controller location. causing some areas of the die to produce more heat?
Gaming PC
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CPUMotherboardGraphicsRAM
Intel Core i7 930 @ 3.5 GHz Asus P6X58D-E EVGA GTX 470 675c 1800m 1350s Corsair Dominator DDR3 1600 MHz 
Hard DriveOptical DriveOSMonitor
Western Digital WD5002AALX Asus DVD-RW Windows 7 Ultimate 64bit Samsung SyncMaster T220 
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Gaming PC
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CPUMotherboardGraphicsRAM
Intel Core i7 930 @ 3.5 GHz Asus P6X58D-E EVGA GTX 470 675c 1800m 1350s Corsair Dominator DDR3 1600 MHz 
Hard DriveOptical DriveOSMonitor
Western Digital WD5002AALX Asus DVD-RW Windows 7 Ultimate 64bit Samsung SyncMaster T220 
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Microsoft Reclusa Corsair TX750w Antec 900 Microsoft SidWinder 
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post #7 of 7
Thread Starter 
I've tried reseating the HSF and reapplied thermal paste (long thin line down the middle of the heat spreader to cover the die).

Same problem, OK temps under 100% load when the case is on its side and 100c when standing upright. The HSF is secure doesn't move at all, could it's weight cause a small gap between the HSF and CPU? The mount for this HSF is spring loaded and seems to put enough pressure on the CPU.

Has anyone else had/noticed this problem with heavy HSF's? if so did you solve it?
Gaming PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 930 @ 3.5 GHz Asus P6X58D-E EVGA GTX 470 675c 1800m 1350s Corsair Dominator DDR3 1600 MHz 
Hard DriveOptical DriveOSMonitor
Western Digital WD5002AALX Asus DVD-RW Windows 7 Ultimate 64bit Samsung SyncMaster T220 
KeyboardPowerCaseMouse
Microsoft Reclusa Corsair TX750w Antec 900 Microsoft SidWinder 
  hide details  
Reply
Gaming PC
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 930 @ 3.5 GHz Asus P6X58D-E EVGA GTX 470 675c 1800m 1350s Corsair Dominator DDR3 1600 MHz 
Hard DriveOptical DriveOSMonitor
Western Digital WD5002AALX Asus DVD-RW Windows 7 Ultimate 64bit Samsung SyncMaster T220 
KeyboardPowerCaseMouse
Microsoft Reclusa Corsair TX750w Antec 900 Microsoft SidWinder 
  hide details  
Reply
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