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Power Supply temps?

C

Childs

Lifer
I'm just wondering what your PSU temps are under full load using something like Speedfan? My Seasonic ST 400W seems to overheat on load when I went to a Opteron 165. Idles around say PSU is 44C, then on full load jumps up in the high 70's. I also had an 3800X2 that showed the same behavior, and I returned it, as I had bought the Opteron online the day before, and Monarch processed it too fast. CPU temps are in the mid 40's at full load, case temp is under 30 in all conditions so far. I did overclock both the Opteron and X2 to 2.4Ghz, but my A64 3200+ was OC'd to 2.4 as well and I didn't notice this temp issue. System is perfectly stable, but it seems like I'm killing the PSU.

Opteron 165@2.4Ghz
Artic Freezer 64 Pro
Asus A8N-E
4x512MBDDR
X800XL
200GB Seagate SATA HD
Seasonic ST 400 PSU
2 120mm Yate Loon
LCD fan controller

Using a wattage calc tool total was under 400W, so I would assume the PSU should be fine. OCing to 2.5 on the Opteron made the psu temps go into the 80s.
 
Indicating a case model type would be a help.
Are there any other fans besides the two Loons and PSU working case air flow?? I don't mean VGA cooler or your 64Pro, like blow hole or side cover fans??

I think you've reached the limits of 12V@18A and I further think that the PSU is air starved. Your 120 front is probably blocked on the suck side by grill work and on the blow side by a cage. The 64Pro is probably feeding the 120 exhaust and diverting air from the PSU's intake that faces down. This can stall air flow through the PSU.
A PSU w/120 fan has reduced and slotted sinks compared to a cross flow that uses an 80mm fan. It will not tolerate reduced flow as well as a cross flow PSU.

Some on this board love negative pressure case cooling...I'm not one of them.

Silverstone makes the ST400. Seasonic makes the SS400. Seasonic uses a lower wattage fan,iirc. A PSU built for silence should not have to gulp for air. Just the way it is if the PSU is expected to remove it's waste heat at near full capacity.

...Galvanized
 
The CPU is generating a lot more heat now. Two cores and more cache on either of them than in the orriginal CPU? That's more heat alright.

Edited for stupid mistake.
 
Case is a Antec SuperLanboy. No other fans or openings. Ambient temp is often under 29C, even under full load. I picked up a Antec SP 500W at Central computer for $59 at lunch today, and it uses the 2 80mm fans, so hopefully it will help. In thinking about it, the air coming in from the from 120 is probably sucked up by the freezer pro, then shot out into the 120mm exhaust. I even managed the cables so the airflow went straight to the freezer pro. That, and the dual core oc'd cpu's power requirements.

The system originally had all the same components, except the stock 120mm antec fans, and a stock amd 64 HSF and A64 3200+ oc'd to 2.4Ghz. I also added head speaders to two dimms, as the other two dimms had them stock.

 
Just to see what happens to PSU temps. Unplug the rear exhaust fan. Let the PSU handle
case exhaust and see what happens. I'd like to see it posted, if you would plz.


...Galvanized
 
OK, unplugging the exhaust didn't really do anything, except raise temps 1-2C all around. Replaced the ST with the Antec SP 2.0 500W and PSU temps dropped 10C, but that just means 77-80C instead of 89-90C.

My temps:

IDLE 1 Core 2 Core
CPU 38 45 55
PSU 39 53 80
MB 29 29 29
HD 29 29 29

Generating load consisted of starting 1 instance of Prime 95 using Torture Test Small ffts, waiting will temps stabilized, then starting another instance.

So what are your PSU temps when doing a similar test? The system is stable, so I'm wondering if this is normal or a problem. Never really checked PSU temps before.

Originally posted by: JEDIYoda
also don`t count on your PSU fans to do the work that some well placed case fans should be doing!!
Click to expand...

Well, aside from cutting a hole in the top of the case and installing an intake fan, don't know what else to do, as the Super Lanboy on has two fan spots, and I'm using both.
 
Childs, your monitoring program of board chip is probably off by a bunch.
At those temps the air off the exhaust would be very warm. If the exhaust grill of the
PSU was not hot just warm, I wouldn't worry about it.

I have no Killawatt and don't monitor PSU temps. I do have a digital pocket thermometer
that I've taped inplace over the PSU and case exhaust fan. At worst my PSU runs 4C hotter than the case. But my case has slightly more intake than exhaust and the PSU's
fan has not been modded for reduced flow.

The high 70sC would be very hot if you touched the PSU's grill. I really think your temp
software is off. Tape a thermometer over the PSU's exhaust. Don't probe a thin metal one in there because
many PSU's have hot heat sinks, about 300VDC, iirc.

...Galvanized
 
Touching the grill or body of the PSU is luke warm at most. Air coming out the PSU is slow, and luke warm as well. My fan controller has a thermal probe, and I placed it in where the wires come out of the PSU on the Super Tornado when it was installed, and it was like 37C at most, but I didn't open it up an monitor the internal temp. I tried Speedfan and Sandra's temp reporting, and they were both the same, and match Asus's probe utility, but Asus's utility doesn't monitor PSU temps, so the other apps could be reading something else.

I guess I'll let it be. If it does at least I have another PSU and can look at it further then. Or crack open the PSU and mount the probe in the PSU near the heatsink and see what's really going on.

 
I just accured to me, after a good meal and thinking a little better.

There is only three componets I can think of that will give high 70C reporting.
Capacitors, rated at 85C or 105C or fets, sometimes called MOSFETs.
Some board monitoring software will give PWM temps. This refers to the chip that controlls
fan speed. Fets and PWM chips rated at about 125C,iirc. The fets normally have three
metal tails off one side. PWM chips will have *generally* four legs off each side.

The point is, be sure your reading your software temp location properly. I'm not saying
your doing it wrong but to double check.


...Galvanized
 
Its very possible. For speedfan there are profiles specific to your board, but you have to register to get one and I didnt, so the readings are generic. Since no one cares about PSU temps, the reading maybe PWM and not PSU. I think some user on some other board said temp3 on the A8N-E in speedfan was power supply temps, but maybe no one really knows as lots of people asked what it was and that was the only post with an answer.
 
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