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post #991 of 1091
Just out of curiosity... how hot are VRM chokes capable of tolerating. I'm playing around with overclocking a FX-8150 on a Gigabyte GA-990FXA-UD3. The motherboard list has it as recommended, but the heatsink is somewhat small, and it does not cover the chokes. I have added fans on the VRM and northbridge heatsinks because there is little air movement in the case with the liquid cooling I use for the CPU.

The FX-8150 is a real current hog, and things really heat up in there at 4.4 GHz and 1.37V. (The CPU is perfectly fine and stable there, with a max temp of 49C). But if I run a high computational load,a few of the chokes can reach over 100C, which seems excessive. The hottest one was being measured in the following picture

450

I know some of these devices can handle really high temps, but I have no idea on the specs for this particular model. Inductors aren't active so they're not going to fail suddenly because of heat, but I'm sure there's a maximum there before the fail and go open circuit.

If I can find a small enough heatsink to put on them, I may do so, but otherwise, I may end up having to change the motherboard for something with a more robust VRM/choke cooling solution....
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post #992 of 1091
I'm in the same boat. at 5.0Ghz OC on my 8150, my VRM's exceed 90c, when they do it will throttle. I just ordered a waterblock for my VRM's to put in the loop, the temps have me worried. VRM block should be here Monday, I will post results.
post #993 of 1091
Thread Starter 

Chokes are pretty tolerable in that they're not active transistors but that kind of heat could be considered worrysome, esp. considering what looks like the presence of nearby airflow.  The 8150 is, however, a very power-intensive chip.

post #994 of 1091
Do they make aftermarket VRM air cooler's and where might I find one? My mobo is the GA-970A-UD3 with fx 8120. Anything I can do to help it would be great.
post #995 of 1091
Thread Starter 

The GA-970A-UD3 is retrofitted with a high end 8+2 phase quality VRM system that is cooled by a heatsink already.

post #996 of 1091
I live in India where 41c - 47c is normal ambient temp in summer time, now is the first month of summer and current ambient is 36c. When I tortured my UD5 in winter with 1055T, it was 100% stable at 4.0ghz and all temp were under the max value. Unfortunately my h70 radiator is blocking enough free space over vrm heatsink. This is causing vrms to become more hot in summer because of lacking normal air flow....will running at 4.0ghz at this ambient temp blow up the vrms of my UD5 ?? Or either they have been built to resist more heat than I think ?? Please help frown.gif before I bought UD5 I had been in a nightmare with three msi board for 1year, they all died. now I dont wanna lose UD5.
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post #997 of 1091
Quote:
Originally Posted by Tonez View Post

Do they make aftermarket VRM air cooler's and where might I find one? My mobo is the GA-970A-UD3 with fx 8120. Anything I can do to help it would be great.

Check my Canary Red Build log, I used some RAM coolers to keep my VRM's cool.

My stance on heat sinks is that if I can't keep my finger on them without losing some skin, it's too hot and can be cooled some more tongue.gif
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post #998 of 1091
Quote:
Originally Posted by xd_1771 View Post

The GA-970A-UD3 is retrofitted with a high end 8+2 phase quality VRM system that is cooled by a heatsink already.

Thanks for your knowledge.
post #999 of 1091
My VRM temps is around 42ºC - 44ºC (idle), CPU not overclocked, are those temps ok?
My question is, i´m thinking to OC the CPU, will VRM temps increase? What is the safety VRM temp by overclocking?
Thanks
post #1000 of 1091

I once ran a 2+1 phase msi board with sig proc at 1.45 volts, and it ran ok for a bit. then I accidentally gave it 2.1 (supposedly, doubt it went that high) and it didn't last long after that.

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