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HX1000 vs Non-corsair 1200W and MB IOH temp differences


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I came across a peculiar problem today that I was hoping maybe a PSU expert could provide some insight on.


I have 2 "identically" configured computers running side by side but there are some small differences between the two. Here are the identical specs:


Case: Cooler Master HAF X

Cooling: Asetek 240mm liquid cooling (OEM)

Motherboard: MSI X58A-GD65

CPU: Intel Core i7-980X

GFX: 3x NVIDIA GeForce GTX 480

Audio: Creative SB Fatality champion whatever (in the PCI-e x1 slot at the top of the expansion stack on the GD65 board)


DIfferent specs:


Machine 1

PSU: Non Corsair but reputable brand TR2 1200W

Memory: Non corsair but reputable brand 6GB @ 1600

HD: 2x 1TB 7200RPM in RAID 0


Machine 2

PSU: Corsair HX1000

Memory: Non corsair but (different) reputable brand 6GB @ 1600

HD: 2x non corsair 128GB SSD in RAID 0, 2x 1TB 7200RPM in RAID 0


When running CPUID's HWMonitor software, the value reported under TMPIN1 for each machine is in the 70C's for Machine 1, and in the 90C's for Machine 2.


Some background: The TMPIN1 value is reporting the IOH chip temp. I confirmed this using a k-type thermocouple connected to a digital thermometer. The MSI X58A-GD65 board being used runs notoriously hot, but not this hot.


I can accept temperatures in the 70's, but certainly not in the 90's and 100's. (temps in celsius)


I have run some preliminary tests using different power supplies in the system exhibiting the higher temperatures.

Test1: Swapped in a 1100W old non-corsair PSU i had laying around. Temperatures were markedly lower, nearly 20C.

Test2: Swapped in a Corsair TX950. At first temperatures were 30C lower, but they rise back to the 90s.


I have not yet ruled out that this particular motherboard just has a hot chip or bad thermal connection on the heatsink, but I am not ready to make that diagnosis yet given the discrepancies when using different power supplies.


So I guess my question is:

Why/how would using different power supplies in a system effect the temperature on the chipset?


Is there any precedent for this? I have been building many computers for many years, most of them very high-end like this, and I have never encountered this particular problem before.


Thanks for any help.



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The most likely thing that I can think of would be that the other PSU has a faster spinning fan that is pulling more air out of the case. The fans on our PSUs will not do a good job of keeping the case cool, they will spin very slowly until you get to about 50% loading. This is to keep noise levels down. You may just need to add an extra cooling fan to keep the chipset temps a little lower. We can definitely try replacing the unit if you would like to try that, but from what you describe it may or may not improve temperatures.
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