Bought a new PSU and now my CPU runs extremely hot, did I buy a bad PSU?

jr1672 · Mar 24, 2017

So my EVGA Supernova gold died during the week and this morning I picked up a Thermaltake SP-750PCBAU Smart 750w 80+ Bronze replacement and installed it and now playing a game I noticed that afterburner is showing me extremely high temps for my CPU and on further inspection it runs pretty hot on idle too

Bear in mind that I've turned my air conditioning on which helps reduce the temperature. In my 2 1/2 years with this build the CPU rarely ever got above 50c at any stage it was the graphics card that usually would run hot sometimes but it has a max temp of 38c. Is it possible I've bought a dud PSU and this is causing high temps? I can't see any visible dislodging of the CPU fan.

CPU: Intel core i5 6600
GPU: R9 390 8gb
MOBO: Gigabyte GA-H170-Gaming 3
PSU: Thermaltake SP-750PCBAU Smart 750w 80+ Bronze

Rogue Leader · Mar 24, 2017

Wow, talk about a massive downgrade. That EVGA you had was a high end PSU, what happened to it? Its probably still under warranty.

The Thermaltake you got is garbage.

That said likely not the cause of your issue. Its possible you moved the cooler or something?

USAFRet · Mar 24, 2017

The PSU can't do that to your temps.
You probably dislodged the CPU cooler during the PSU installation. Might not be visible, but it only take a little bit.

jr1672 · Mar 25, 2017

Rogue Leader :

Yeah it's under warranty with EVGA and it also costs $252 to ship the thing to Taiwan for repair so obviously I'm not doing that nor will I ever buy another EVGA product again, this thing only lasted 2 years.

I don't think I did but I'll just take it off and put it back on I guess.

Rogue Leader · Mar 25, 2017

Wow I'm guessing you're not in the US. Thats ridiculous to pay for warranty service.

I think the cooler re-install will fix your issue. If you can exchange that Thermaltake theres so many better quality PSUs out there, that one is pretty bad.,

jr1672 · Mar 25, 2017

I live in Australia and I'm pretty pissed off about this too. I only bought this because I'm severely strapped for money.

jr1672 · Mar 25, 2017

USAFRet :

I had a look at yeah the cooler fan seemed to be loose and I've no idea how that could have happened since it's one of the ones where you need to twist the corner pegs around to get it out, I took it out and put it back in. Thermal paste seems to be alright there's certainly no hint of anything being fried. I booted up skyrim in the menu and got around 50C where as before it shot straight up to 100C and on idle I'm getting mid 20's where as before it was way high as you can see.

Thanks to both of you, I feel dumb for looking at it but not touching it but as I said it's one where you need to actively maneuver it or so I thought. And yeah I know it's not the greatest PSU but it will get me through until Easter I hope when I have more money.

jr1672 · Mar 25, 2017

Rogue Leader :

Derp, I obviously wasn't putting the CPU cooler in properly as it became dislodged again after I told you I fixed it and now that I've really got it in and laying the pc case on its side I'm getting idle temps of 21c and in Skyrim I was in the 40C range. This is like the time I bought my GPU and didn't notice the power cable came dislodged from the PSU lmao and I couldn't work out why it wasn't working.

I know my PSU is garbage, any suggestions for a good one that aren't EVGA? What I hate most about this is there are so many unused cables which makes cable management impossible whereas with the EVGA I only used what I needed

kol12 · Mar 25, 2017

jr1672 :

This should help: http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html

You'll want what's called a modular PSU where only the cables that are needed can be plugged in and any remainders stored away. I have a Seasonic PSU and some of the top tier PSU's are are actually even made by them.

jr1672 · Mar 25, 2017

kol12 :

Thanks for the list mate, modular is the way to go. It's so crap having so many cables and nothing doing with them. I'll research some Seasonic PSU's

kol12 · Mar 25, 2017

jr1672 :

No worries, good luck!

Rogue Leader · Mar 26, 2017

+1 on Seasonic, best in the business.

jr1672 · Mar 27, 2017

Rogue Leader :

I'm having trouble booting my PC with the new (admittedly crap) power supply, is it possible the the problem would be from the case or the mobo? Nothing happens when I try to attempt to boot up like it did with the other one but eventually it will, I should test my other PSU but now I don't want to shut it off incase I don't get it back on lol

Rogue Leader · Mar 27, 2017

jr1672 :

Make sure all connections are tight, the PSU is properly mounted, etc. My hope is that the broken PSU didn't cause any damage.

jr1672 · Mar 28, 2017

Rogue Leader :

What do you think of this? You know on the PSU how there is the switch, for some reason if I turn that off and leave it for a few minutes then turn it on and try and boot up my computer then the computer boots up. Does this indicate a PSU issue? This is the second crappy PSU I'm using btw I haven't tried the other one and this is what makes it hard for me to identify the problem because it just seemed like an obvious PSU problem before. What I am going to do is when I go to bed I'll turn it off at the PSU and see if it boots in the morning.

Rogue Leader · Mar 28, 2017

Hmm maybe building up resistance within the PSU. Could be a short somewhere. Could be a Short in the PSU.

jr1672 · Mar 28, 2017

Rogue Leader :

Well the good news is that PCCG have accepted my request for a warranty, I also got my time wrong in the OP I had the PSU for 1 1/2 years not 2 1/2 I can't count lol

I'll stick the old PSU a bit later and see if that will get it booting and if it does then I'm assuming the issue is in the case or the motherboard.

jr1672 · Mar 28, 2017

Rogue Leader :

I just got the PC to boot up immediately after about 10 1/2 hours of having it shut down with the PSU itself switched to off. So I'm guessing there is an issue with power either coming from the PSU or getting to the motherboard when it remains switched on between boots, what do you think?

Rogue Leader · Mar 28, 2017

jr1672 :

I agree I think the PSU has an issue. My concern would be whether the PSU caused the issue or the PSU was damaged by something else in your system. Unlikely but possible.

How soon will you have the warranty unit? Then you will know if its a problem.

Bought a new PSU and now my CPU runs extremely hot, did I buy a bad PSU?

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