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Cooling i7 2600k with Thermalright Ultra-120

post #1 of 11
Thread Starter 
Hello,

This is pretty much my first post, so I apologize in advance for doing something wrong tongue.gif

So here's the situation:
Three weeks ago I've assembled myself a new gaming rig with i7-2600k and Asus p8z77-v pro. I've decided to use my trusty old Thermalright (that used to cool q9550@3.8GHz) for cooling the CPU. I have managed to get it (so far) stable at 4.5GHz @ 1.30V. I have some concerns regarding the cooling though:

The TRUE is lapped (mirror-like, I've done it about two years back) it has two fans on it in a push-pull setup (Coolink SWiF2-120P PWM 120mm x 2), and mounted securely (I can't rotate it with my hand at all when it's screwed down). I have used Zalman STG-1 thermal compound (it comes with a little brush, so there is pretty much no way to screw up with that, is there?). The case is Cooler Master CM690 with:
exhaust:
2x 140mm fans on top
1x 120mm Coolink SWiF2-120P PWM 120mm on the back
intake:
1x 140mm side
1x 140mm bottom
1x 120mm front

I've rearranged the cables so that they do not obstruct the airflow.

I've run 8-hour Prime 95 as a stability test a week ago and peak core temperature was somewhere like 75°C. Now that I know it's pretty much stable, I'm testing temperatures using Intel Burn Test (maximum stress, 10 runs gives it pretty good beating, I think?). Maximum temps I've recorded at this frequency and voltage was 78°C (on one core, others around 75°C). Ambient temperatures are pretty hot those last couple of days (my room termometer, next to the PC, shows 28°C-30°C), and my PC is standing on my desk right next to the window, getting some sunshine during the day... No way really I could move it.

Also, I have managed to get a (hopefully) stable 4.7GHz@1.35V, but it came at a price of raising the temps - to about 86°C on the hottest core while doing IBT test. Would it be safe to leave it at that?

Disabling the HT drops temperatures by about 10°C.

Are those temperatures about right or should I be looking for a better cooler? I'd rather not, since I blew all my cash reserves already smile.gif

I'll be grateful for any input on this.
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Samsung SSD 830 128 Windows XP Proffesional SP3 Samsung SyncMaster 2433BW Pentagram 620W (made by Sirtech) 
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post #2 of 11
I only can advice you to see if the lapping you applied it didnt was too much for being close to IHS´s cpu and dont get the heat well or you applied in bad way the TIM or you heatink fans arent good enough or

you didnt have some settings ok on the bios/eufi(I cant talk about it)
post #3 of 11
Thread Starter 
Okay, here is what I attempted today: First, I thought that maybe the heatsink base isn't as flat as I remembered. So I took it off and used the credit card trick to check it (put it against the heatsink base diagonally and check for any spaces) - it appears as flat as it gets. So I then thought that maybe the cpu isn't very flat, so I cleaned it all from the thermal grease and then put more of it (applied a thin layer not only on CPU, but also on the heatsink base). After assembling it back together (which is a pain in the ass, given the TRUE 1155 mounting system...) I've run the IBT (same settings as before, ambient about 30°C) - and BAM, immediately the core temp jumped to almost 90°C. So I turned it all of, disassembled again, cleaned it and put as little thermal grease as possible (still using the same Zalman STG-1). After booting up I'm back to situation I've described in the first post (75°C+ under stress test).

I've also tried running it @ stock to see what temps it'll get. It got to 56°C under full load @ stock.

I'm stumbled. I really don't feel like spending money on some ultra high end cooler, since I thought Sandy Bridges were easy to cool frown.gif
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CPUMotherboardGraphicsRAM
i7 2600k Asus p8z77-v pro GTX 680 2x4GB Corsair Vengeance 
Hard DriveOSMonitorPower
Samsung SSD 830 128 Windows XP Proffesional SP3 Samsung SyncMaster 2433BW Pentagram 620W (made by Sirtech) 
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My System
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i7 2600k Asus p8z77-v pro GTX 680 2x4GB Corsair Vengeance 
Hard DriveOSMonitorPower
Samsung SSD 830 128 Windows XP Proffesional SP3 Samsung SyncMaster 2433BW Pentagram 620W (made by Sirtech) 
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Cooler Master CM690 Logitech MX518 Steelpad QCK ministeel 
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post #4 of 11
Have you tried re-seeding it? I am no expert in OC the 2600k but not every chip can reach 5.0 on air.
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Intel X25-M 80GB SSD ASUS Lightscribe Windows 7 64bit 24" Samsung LCD 
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post #5 of 11
Thread Starter 
I'm not trying to get to 5.0GHz smile.gif I'm hoping to find out if the temperatures I'm getting are normal. I'd be perfectly happy with 4.5-4.7. And I have no idea what you mean by re-seeding the cpu. Googling it only led me to information about lawns tongue.gif
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k Asus p8z77-v pro GTX 680 2x4GB Corsair Vengeance 
Hard DriveOSMonitorPower
Samsung SSD 830 128 Windows XP Proffesional SP3 Samsung SyncMaster 2433BW Pentagram 620W (made by Sirtech) 
CaseMouseMouse Pad
Cooler Master CM690 Logitech MX518 Steelpad QCK ministeel 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k Asus p8z77-v pro GTX 680 2x4GB Corsair Vengeance 
Hard DriveOSMonitorPower
Samsung SSD 830 128 Windows XP Proffesional SP3 Samsung SyncMaster 2433BW Pentagram 620W (made by Sirtech) 
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Cooler Master CM690 Logitech MX518 Steelpad QCK ministeel 
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post #6 of 11
Sorry posted before I saw your last comment, If you do upgrade your cooler it another air option don't expect drastic improvement. the Thermalright Ulra-120 is a beast so another $80 dollar cooler wont help too much IMO.
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Hard DriveOptical DriveOSMonitor
Intel X25-M 80GB SSD ASUS Lightscribe Windows 7 64bit 24" Samsung LCD 
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G15 Ultra X4 850W coolermaster Cosmos S G9 
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Banshee Pad 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q9550 @ 3.84 ASUS P5E MSI GTX 275 4GB DDR2 Corsair Dominators 
Hard DriveOptical DriveOSMonitor
Intel X25-M 80GB SSD ASUS Lightscribe Windows 7 64bit 24" Samsung LCD 
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G15 Ultra X4 850W coolermaster Cosmos S G9 
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post #7 of 11
Quote:
Originally Posted by Piff_paff View Post

I'm not trying to get to 5.0GHz smile.gif I'm hoping to find out if the temperatures I'm getting are normal. I'd be perfectly happy with 4.5-4.7. And I have no idea what you mean by re-seeding the cpu. Googling it only led me to information about lawns tongue.gif

reseat heat sink (which you have), sorry about that. rolleyes.gif
My System
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Hard DriveOptical DriveOSMonitor
Intel X25-M 80GB SSD ASUS Lightscribe Windows 7 64bit 24" Samsung LCD 
KeyboardPowerCaseMouse
G15 Ultra X4 850W coolermaster Cosmos S G9 
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Banshee Pad 
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My System
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CPUMotherboardGraphicsRAM
Q9550 @ 3.84 ASUS P5E MSI GTX 275 4GB DDR2 Corsair Dominators 
Hard DriveOptical DriveOSMonitor
Intel X25-M 80GB SSD ASUS Lightscribe Windows 7 64bit 24" Samsung LCD 
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G15 Ultra X4 850W coolermaster Cosmos S G9 
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post #8 of 11
Thread Starter 
Thanks for all the replies. I think I'm going to leave the cooler alone, I'll just try to reset BIOS settings to defaults and starting over with the overclocking. Maybe I've messed up with some PLL settings...
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i7 2600k Asus p8z77-v pro GTX 680 2x4GB Corsair Vengeance 
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Samsung SSD 830 128 Windows XP Proffesional SP3 Samsung SyncMaster 2433BW Pentagram 620W (made by Sirtech) 
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My System
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CPUMotherboardGraphicsRAM
i7 2600k Asus p8z77-v pro GTX 680 2x4GB Corsair Vengeance 
Hard DriveOSMonitorPower
Samsung SSD 830 128 Windows XP Proffesional SP3 Samsung SyncMaster 2433BW Pentagram 620W (made by Sirtech) 
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post #9 of 11
Hi piff paff,

1) are those temps while running prime 95 or someother stability /temp checking program?

2) Have you tried to reduce Vcore and se if you are still stable?

3) It may sound simple but double check your fans to make sure one is pulling and the other pushing?

I believe you have fan settings that you can use to speed up processor and system fans, have you adjusted those at all?

Also check air flow through the case

Hope this hepls good luck and have a great day.
    
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post #10 of 11
Thread Starter 
Well, I found out those temps are pretty similar whether running In-place large FFT prime 95 or IBT, so I alternate between the two smile.gif

I cannot reduce Vcore any further, since this is the least that gets me stable (actually, it's set to -0.30V with Load Line Calibration set to medium, which sums up to 1.30V under stress - as shown in CPU-Z). If I tried disabling the PLL whatsoever and setting manual Vcore I'd need 1.34V, which is even worse for the temps.

When stress testing I always set all fans to 100% speed.

What bothers me is that even when the CPU hits 75+ degrees, the TRUE is only barely warm (of curse, I mean it's top part, where I can put my hand :]). But I've re-set it and it seems ok by all means, so I honestly have no idea what's going on. I don't think that the radiator itself might be... broken?smile.gif

I think after todays shenanigans I'll just leave it as is for a couple of days to let the thermal grease settle in once more, and maybe the weather will change so I could have more reliable results (as in: not with 30°C in my room...).

Thanks for all the advice.

Update: This issue wouldn't let me sleep, so I went ahead and took it all apart once more. After removing the TRUE I've noticed that the middle of it's base doesn't have any marks from the thermal paste. Knowing that the heatsink is lapped and flat, it indicated that the CPU is a bit concave in the middle (apparently that is the reason why Thermalright makes its new coolers convex in the middle!). Not willing to lap my new (and quite expensive) CPU I've decided to:
1. apply a bit more thermal grease in the middle of the CPU. I know it's a bad practice, but I couldn't see any other options.
2. apply a little pressure mod of my own: I've put a tiny rubber washer into the hole in the middle of TRUE's base.

Effects? In the exact same conditions as before, where it was hitting 78°C, it's now getting 69°C max! Additionally, the temperature differences between cores are now much smaller - where there used to be 5-6°C between coolest and hottest core, now it's 3°C. I'm very happy.

Thanks for your interest in the subject everyone, have a nice day smile.gif
Edited by Piff_paff - 5/3/12 at 9:08am
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CPUMotherboardGraphicsRAM
i7 2600k Asus p8z77-v pro GTX 680 2x4GB Corsair Vengeance 
Hard DriveOSMonitorPower
Samsung SSD 830 128 Windows XP Proffesional SP3 Samsung SyncMaster 2433BW Pentagram 620W (made by Sirtech) 
CaseMouseMouse Pad
Cooler Master CM690 Logitech MX518 Steelpad QCK ministeel 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k Asus p8z77-v pro GTX 680 2x4GB Corsair Vengeance 
Hard DriveOSMonitorPower
Samsung SSD 830 128 Windows XP Proffesional SP3 Samsung SyncMaster 2433BW Pentagram 620W (made by Sirtech) 
CaseMouseMouse Pad
Cooler Master CM690 Logitech MX518 Steelpad QCK ministeel 
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