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7970 VRM temps!?!?

Five.Stars

Five.Stars

Five.Stars

Soldato
Joined
7 Aug 2012
Posts
2,657
Have had my reference 7970 since launch and had an Accelero Xtreme for a few months, which is a great cooler. However, today I checked out my VRM temps using gpu-z and vrm1 was getting very close to 90°. Is that normal. I think vrm2 was nearer the core temp of 60°. I have the fan on the Accelero set to 100% whilst overclocked gaming/ benchmarking as it is barely audible even at that rpm.

This is with a reasonably good overclock of 1185/6500 @ 1212mV (according to Trixx although gpu-z shows around 30mV less consistently)

So a double barrel question really:

a) is gpu-z showing the more accurate voltages and if so, why is Trixx desplaying a higher voltage?

b) what are the vrm's rated safe temperatures on the 7970?
 
I get/got artifacts over 75°C.

Most aftermarket VGA coolers (including mine) don't do a great job with the VRM's unfortunately. You'll notice that most reviews go to trouble of fitting all those VRAM/VRM heatsinks and then only tell you what the core temp results are...:rolleyes:

I got around it and got great results with my own solution, but that probably wouldn't work in your situation with the accelero :(

Are you seeing any artifacting/glitching/crashing etc?
 
I suppose that's where my Matrix Platinum shines! lol. GPU Tweak for some reason has the fan profile linked to the VRM (VDDC) temperatures... In the latest update they changed it so Fan1 is linked to GPU and Fan2 is linked to VRM (VDDC) temperature.
Though i don't that was intended.... lol! :p
 
Rossi~ said:
I suppose that's where my Matrix Platinum shines! lol. GPU Tweak for some reason has the fan profile linked to the VRM (VDDC) temperatures... In the latest update they changed it so Fan1 is linked to GPU and Fan2 is linked to VRM (VDDC) temperature.
Though i don't that was intended.... lol! :p
Click to expand...


There is a new post for you on ROG Gpu tweak thread :)
 
Uncle Petey said:
I get/got artifacts over 75°C.

Most aftermarket VGA coolers (including mine) don't do a great job with the VRM's unfortunately. You'll notice that most reviews go to trouble of fitting all those VRAM/VRM heatsinks and then only tell you what the core temp results are...:rolleyes:

I got around it and got great results with my own solution, but that probably wouldn't work in your situation with the accelero :(

Are you seeing any artifacting/glitching/crashing etc?
Click to expand...

Not at the clocks mentioned in original post. All is fine, but if I try increasing either the core or memory I start to see small artifacts about halfway through heaven. So I think that I am at the wall with that voltage (1.212 according to Trixx) However, putting more voltage through it is getting the VRM1 very toasty and I don't like seeing anything get that hot. 1185/6500 is fast enough to be honest. Was just interested to see if could get any more out of it. I did try it with around 1300mV but system just shut itself off so I wont go that high again obviously!
 
What may help a little are these:

YOUR BASKET
1 x Alpenföhn Passive DRAM / VRAM Chip Coolers £11.99
Total : £14.27 (includes shipping : £1.90).



Use the slim ones on the VRM's and you may see slightly better results.
How much better I don't know, but the heatsinks that come with the Accelero aren't very good quality so it's worth a try I guess.

Don't expect 20°C drops or anything though :D
 
I am not sure the thermal glue that is supplied with the Accelero is great to be honest. Would it be worth removing and trying some thermal tape or are those acceptable temps as long as I do not get artifacts/ crashing?

Will say 1 thing for the Accelero, it sure keeps the core nice and cool. No matter what you do with it, it rarely goes above 60. That is a good 20 degrees cooler than stock and much, much quieter.
 
Uncle Petey said:
What may help a little are these:

YOUR BASKET
1 x Alpenföhn Passive DRAM / VRAM Chip Coolers £11.99
Total : £14.27 (includes shipping : £1.90).



Use the slim ones on the VRM's and you may see slightly better results.
How much better I don't know, but the heatsinks that come with the Accelero aren't very good quality so it's worth a try I guess.

Don't expect 20°C drops or anything though :D
Click to expand...

Might give them a try. Cheers.
 
Yah, the Accelero does cool the core very well.
I found thermal glue worked better than thermal tape, but it's the Alpenfohn glue that came with the cooler (which doesn't take 5hrs to cure) and the tape that came pre-installed on the card that I'm comparing.

That glue does come with the heatsink kit, but I'm not sure that it's as easily removable as the Arctic stuff if that could be a problem for you.

Your temps aren't ideal, but if you're not seeing any issues, then you're probably ok as you are. It is technically within spec so...
 
whyscotty said:
There is a new post for you on ROG Gpu tweak thread :)
Click to expand...

Yep, pretty much what happens. Funny thing is though, in the previous versions they were both linked to just the VDDC temperature lol.
I still wonder whether it was planned or just a **** up they made work for them.
Either way I've managed to set a profile that works brilliantly now so that's that sorted. Just need to sort out the other bugs, by that I mean the reliability.
 
Rossi~ said:
Yep, pretty much what happens. Funny thing is though, in the previous versions they were both linked to just the VDDC temperature lol.
I still wonder whether it was planned or just a **** up they made work for them.
Either way I've managed to set a profile that works brilliantly now so that's that sorted. Just need to sort out the other bugs, by that I mean the reliability.
Click to expand...


getting to the point were they make it up as they go along :confused:

Put mine in my other rig(2500k) runs sweet now,
 
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Yeah? The card itself is brilliant; I don't blame you. I was tempted to get another, but X79 and all.... Don't wanna lose the 3930k
 
If you take a Dremel to the heatsink, the big Alpenföhn vrm heatsink works a treat with the AC.:D

Temps of 95c@75-100% fan speed dropped to 85c on AUTO fan speed.


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Take the fan+shroud off first, start cutting then give it the best clean of your life afterwards as the tiniest piece of shrapnel can take out various parts of your rig never mind 'just' your gpu.

Note- to the left of the Vrmsink, the AC protective conducting strips sit between the Vrm and the black/grey bank of chips as to not short anything as per the AC instructions.

If you judge the depth correctly, using thermal tape, the AC heatsink prevents the vrmsink from dislodging when assembled.




The heatsinks that come with the AC 79* Extreme are nothing short of abysmal!

I couldn't believe the cheapness in the weight/quality of the metals used in comparison to the ones that came with my 5870 Extreme.

It really is a poor show considering the heat put out on the vrms on the 79's.

I used to recommend the Ac's as second to none in the grand scheme of aircooling a gpu(CrossFire/SLi compatible), but now only if you pay extra on top for the Alpenföhn heatsinks.

Poor poor show considering it would have added a couple of £'s at the most on top of the price for proper heatsinks.:(



If you used the glue on the heatsinks:

'the use of lighter fluid can usually unbond the adhesive. in severe situations, i've
left the object in a direct sunlight outside to "heat" or "temper the object, quickly
bring item inside (with a pot holder is good) and start the lighter fluid application.
using a glue applicator with a needle tip and a couple of drops to each pad at
the seam of surface and pad, wait a minute or two and repeat until the pad starts
to release. then when released dob the areas with a clean towel and fluid to clean
the surface. the lighter fluid will evaporate quickly in hot temperatures.'

http://www.overclock.net/t/1285452/deepcool-dracula-vga-cooler-buyer-beware-its-irreversible
 
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