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Author Topic: Power Supply Causing CPU Temp?  (Read 3396 times)
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Scraper
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« on: November 28, 2011, 06:48:50 PM »

Is it possible for an inadequate or faulty  power supply to cause the CPU to overheat? I ask because I think this is what is happening with a new system build. A bit of back ground. I made a new PC, with all new parts, except the PS. I took the PS from another comp.

Here's the old comp specs:

Intel i7 920
6 gigs DDR3
Win 7 64
Geforce 460
550 Watt PS

Here's the new comp specs:

AMD Phenom II 650
MSI 970A-G45 Mobo
6 gigs DDR3
Win 7 64
Geforce 460
550 Watt PS

So just prior to me swapping out the power supply from the old comp into the new one I noticed that the old comps CPU fan was running really fast and the CPU was running hot. I swap out the PS with a new 750watt one and the system's CPU heat is back to normal and the fan is running quietly.

Now with the old 550 Watt PS in the new comp I have the same problem. The CPU runs hot 55 to 60 under stress, and the CPU fan sounds like an airplane getting ready to take off.

So the only common thing here is the PS, given that replacing it in the old comp solved the problem I'm gonna guess that it is the problem in the new comp as well. I have all the voltage set to the bios default so no over clocking going on here.

Anyone else concur? I'm probably going to get a new PS for the new system, but wanted some opinions.
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TheAtomicKid
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« Reply #1 on: November 28, 2011, 09:57:01 PM »

Faulty psu could be putting out too much voltage on the 12v rail, which is what all modern cpu's feed off of. More than a little bit would fry the cpu though.

Conclusion. Plausible, if unlikely.

The fact that the problem moved with the psu indicates the psu IS at fault, but whether it's overvolting, or has a crappy fan and causing the case to not ventilate properly or some other somesuch issue, doesn't really matter.

Get it tested if you want to follow up, but a supply that small is so cheap that the testing will cost you more than it's worth, unless you have free access to a tester somehow.

http://www.jonnyguru.com

Atomic
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« Reply #2 on: November 29, 2011, 01:08:37 AM »

It's not the Power Supply fan. I tested this. It's the actual CPU fan.

When I got home today I swapped in the 750watt PS I have into the new PC and the problem was solved. I definately think it was the PS causing the overheating. So there's no way I'm putting the old PS back in this system, I don't want to risk blowing the CPU. So it's off to Newegg.
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Calavera
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« Reply #3 on: November 29, 2011, 01:16:26 PM »

With the GTS 460, a 550W power supply is at the minimum required. Because the power supply has to work really hard, it generates more heat. If your case is laid out like most, the power supply fan blows right onto the CPU. I'm kinda surprised the only problem you had was heat and not stability...
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TheAtomicKid
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« Reply #4 on: November 29, 2011, 10:11:19 PM »

Quote from: Calavera on November 29, 2011, 01:16:26 PM

With the GTS 460, a 550W power supply is at the minimum required. Because the power supply has to work really hard, it generates more heat. If your case is laid out like most, the power supply fan blows right onto the CPU. I'm kinda surprised the only problem you had was heat and not stability...

That's the because they massively overspec what's required due to people buying crappy parts for cheap. The gpu has a TDP (thermal design power) of 160 watts for the 1gig variant. The rest of the system is adding up to 220 watts, unless he has a crapload of hard drives that he didn't bother to mention, or something attached that draw a lot of power from the psu, like a sound card with a built-in amplifier. (130 watts for the cpu, I'm allowing 40 watts for the mobo itself, since tdp numbers are hard to come by for chipsets, 10 watts per dimm of ram, 10 watts for a hard drive, 10 watts for an optical)

Right now, from what was listed, plus an estimated average system for what is NOT listed, he's only showing 380 watts at full load. His psu shouldn't be overloaded or even stressed.

And that's at theoretical maximum load. Ever burned an optical disk while running furmark and prime95 and/or cpuburn at the same time that you defrag your hard drive? biggrin

Atomic

PS: Old ATX spec had psu's as an intake fan. Any modern supply is up to date, and is an exhaust fan 100%.
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Calavera
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« Reply #5 on: November 30, 2011, 04:00:16 PM »

Quote from: TheAtomicKid on November 29, 2011, 10:11:19 PM

Quote from: Calavera on November 29, 2011, 01:16:26 PM

With the GTS 460, a 550W power supply is at the minimum required. Because the power supply has to work really hard, it generates more heat. If your case is laid out like most, the power supply fan blows right onto the CPU. I'm kinda surprised the only problem you had was heat and not stability...

That's the because they massively overspec what's required due to people buying crappy parts for cheap. The gpu has a TDP (thermal design power) of 160 watts for the 1gig variant. The rest of the system is adding up to 220 watts, unless he has a crapload of hard drives that he didn't bother to mention, or something attached that draw a lot of power from the psu, like a sound card with a built-in amplifier. (130 watts for the cpu, I'm allowing 40 watts for the mobo itself, since tdp numbers are hard to come by for chipsets, 10 watts per dimm of ram, 10 watts for a hard drive, 10 watts for an optical)

Right now, from what was listed, plus an estimated average system for what is NOT listed, he's only showing 380 watts at full load. His psu shouldn't be overloaded or even stressed.

And that's at theoretical maximum load. Ever burned an optical disk while running furmark and prime95 and/or cpuburn at the same time that you defrag your hard drive? biggrin

Atomic

PS: Old ATX spec had psu's as an intake fan. Any modern supply is up to date, and is an exhaust fan 100%.

Ah, derp on my part then. It's been a long time since I've had to buy one. Good to know, though, I'm about to buy a 560Ti and I shouldn't have to worry about replacing the 550W I've got now.
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TheAtomicKid
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« Reply #6 on: November 30, 2011, 09:19:11 PM »

http://www.jonnyguru.com/index.php

My favorite stop for power supply reviews. He might have tested yours in the past.

Basically, if it's a quality unit, you'll be fine. I can run my current rig on my seasonic 380 watt unit, as an example, though I don't because I have to finagle the pci-e (it only has one 6 pin cable)

(q6600, p45 mobo, 8 gigs ram in four dimms, and a gtx 260 gpu)

And it absolutely handled it with the previous gpu (an 8800gts/320 built by evga, overclocked of course), without even blinking.

Atomic

PS: Part of the problem is that, because the psu directly feeds modern video cards via the pci-e cables with no filtering except what's available on the cards (which is slim or none in a lot of cases, though some newer ones are including more), modern gpu's are extremely sensitive to crappy power conditions. If your psu is crap, you get things like artifacting, gpu resets, and more. In fact, it pretty much looks exactly like your gpu is failing, except it isn't. It's the power supply.
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TheAtomicKid
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« Reply #7 on: December 12, 2011, 03:35:51 AM »

Quote from: Scraper on November 29, 2011, 01:08:37 AM

It's not the Power Supply fan. I tested this. It's the actual CPU fan.

When I got home today I swapped in the 750watt PS I have into the new PC and the problem was solved. I definately think it was the PS causing the overheating. So there's no way I'm putting the old PS back in this system, I don't want to risk blowing the CPU. So it's off to Newegg.

Ok, the 'Egg has had time to come through. What did you buy, and did it properly solve your problem? biggrin

Atomic
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« Reply #8 on: December 12, 2011, 04:56:33 PM »

Quote from: TheAtomicKid on December 12, 2011, 03:35:51 AM

Quote from: Scraper on November 29, 2011, 01:08:37 AM

It's not the Power Supply fan. I tested this. It's the actual CPU fan.

When I got home today I swapped in the 750watt PS I have into the new PC and the problem was solved. I definately think it was the PS causing the overheating. So there's no way I'm putting the old PS back in this system, I don't want to risk blowing the CPU. So it's off to Newegg.

Ok, the 'Egg has had time to come through. What did you buy, and did it properly solve your problem? biggrin

Atomic

I went with a Raidmax 730 Watt PS. It worked. Although whenever I go into the bios the system inaccurately reads the CPU temp. What happens is it will rise really quickly up to about 70 degrees, with the fan working like crazy to cool it. Then all of a sudden it falls back down to about 35. Literally one second it reads 70, then the next 35. This happens every time I first go into the bios. So I think I had a combo problem of a buggy bios and a bad PS. I've updated my bios to the latest one too and it still does it.

I've read reports of this same thing happening to other people with the same board, so I'm hoping a future bios update fixes it.
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" And they are a strong and frightening force, impervious to, and immunized against, the feeble lance of mere reason." Isaac Asimov
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