i7-940 not OCed runs at 99C

[dmastin]

I have an i7 940 with liquid cooling. All bios settings are factory default. It's a Dell 730x system. I've been working with Dell tech support as my front CPU fan spins up to 4100 rpms when the CPU is under full load (with P95 or Left4Dead game). HWMonitor provides these temperatures:
Temperature sensor 0 98°C (208°F) [0x2] (Core #0)
Temperature sensor 1 87°C (188°F) [0xD] (Core #1)
Temperature sensor 2 99°C (210°F) [0x1] (Core #2)
Temperature sensor 3 79°C (174°F) [0x15] (Core #3)
The system is stable, but that fan makes quite a bit of noise. These temperatures seem high relative to what you guys are reporting, but the Dell folks seem to think they are acceptable. What's going on? I read somewhere the TJmax for this chip is 105? Any thoughts? Thanks in advance!

 

[Phunk0ne]

wow, that must be a lousy watercooling setup then. Might as well go for a refund and build one your own. 80ish should be fine, but anything beyond 90 is definitely something I would worry about.

HardOCP Overclocking & Heat.

definitely seen in this video, whatever watercooling setup is used in that Dell, it's definitely not up to snuff.

 

[aigomorla]

is your pump even on?

that looks to me like you have a really poor h2o system, or your pump isnt on.

 

[yh125d]

Originally posted by: dmastin
but the Dell folks seem to think they are acceptable.

Dell folks are wrong. Either you're sensing the wrong temps, or something it seriously wrong. Like, water pump not turning seriously.


Check temps with a couple more tools. Coretemp and realtemp, maybe everest and tell us what you get

 

[dmastin]

Yikes, here are my CoreTemp (ver .99) results within three seconds of starting P95:
21:23:03 01/23/09 CPU#0 (Core#0): 103 103 104 100 2926.00
21:23:03 01/23/09 CPU#0 (Core#1): 103 103 104 100 2926.00
21:23:03 01/23/09 CPU#0 (Core#2): 93 93 95 100 2926.00
21:23:03 01/23/09 CPU#0 (Core#3): 93 93 95 100 2926.00
21:23:03 01/23/09 CPU#0 (Core#4): 105 104 105 100 2926.00
21:23:03 01/23/09 CPU#0 (Core#5): 105 104 105 100 2926.00
21:23:03 01/23/09 CPU#0 (Core#6): 86 86 88 100 2926.00
21:23:03 01/23/09 CPU#0 (Core#7): 86 86 88 100 2926.00

I'm not sure where realtemp stores a log, but it shows high core temps of core one and two of 93C when running P95.

Originally posted by: yh125d

Originally posted by: dmastin
but the Dell folks seem to think they are acceptable.

Dell folks are wrong. Either you're sensing the wrong temps, or something it seriously wrong. Like, water pump not turning seriously.


Check temps with a couple more tools. Coretemp and realtemp, maybe everest and tell us what you get

 

[masteryoda34]

Wait, the Dell PC you bought came with a watercooling system?!?!?

If so, that is unfortunate. I was not aware they sold such systems, but if they do, they probably use the Asetek LCLC (low cost liquid cooler), which would hardly be sufficient for an i7. You'd be better off with a high-end air cooler. (TRUE, CM V8, etc.)

Take some pics of inside the case if you can, so we can look at Dell's sad excuse of a water-cooling system.

(BTW: I have a watercooled system myself.)

 

[Duvie]

I find it hard to imagine that wouldn't had test setups before they set one up for sale....

I have a feel the pump is not running or there is a huge air bubble in the system.....

I had a coolit freezone that after 1 year developed a bumble that was 5-6 inches long....My temps went from 50c under heavy load to 80c at idle to 10% load.....

Put you hand on the pump and see if you feel a vibration....
Check the tubing to feel its temp....feel the block....that will obvious if temps are legit....

At 100c this thing should be throttling right? If so an app like rightmark cpu will catch this...if it not throttling and block feels cool then it could have a bad board sensor

 

[dmastin]

Hi Folks,
My problem is solved.
My i7-940 was running hot (i.e. 90-105C) under load.
After hours problem solving with Dell I posted my temps to five different computer enthusiast forums and the consensus was my waterblock/heatsink has to be loose or my pump is not working. First thing I thought when opening up to inspect my system was the that the shroud over the CPU pump that is attached to the waterblock seems like a very bad design and was loose. Well, after reading thirty or forty posts about how there is no way my i7-940 temps should be so high, I tightened the screws on the waterblock. My temps dropped about 20C-40C depending on load. Problem solved. Turns out the system is designed just fine if installed correctly. I'm a bit stumped that the Dell folks didn't seemed surprised my CPU was running at close to failure temperatures. To reiterate, my i7-940 CPU under load now runs at 60C instead of 90-105C. Thanks to everyone who listened and helped!

 

[KeypoX]

Originally posted by: dmastin
Hi Folks,
My problem is solved.
My i7-940 was running hot (i.e. 90-105C) under load.
After hours problem solving with Dell I posted my temps to five different computer enthusiast forums and the consensus was my waterblock/heatsink has to be loose or my pump is not working. First thing I thought when opening up to inspect my system was the that the shroud over the CPU pump that is attached to the waterblock seems like a very bad design and was loose. Well, after reading thirty or forty posts about how there is no way my i7-940 temps should be so high, I tightened the screws on the waterblock. My temps dropped about 20C-40C depending on load. Problem solved. Turns out the system is designed just fine if installed correctly. I'm a bit stumped that the Dell folks didn't seemed surprised my CPU was running at close to failure temperatures. To reiterate, my i7-940 CPU under load now runs at 60C instead of 90-105C. Thanks to everyone who listened and helped!

dude that is completyly fcked up

Dell people dont knwo anything about temps or computers though. They just following prompts on a screen.

 

[masteryoda34]

Dell + Watercooling = Fail