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-   -   Radeon 5970 Overclocking: The VRM Temperature Bottleneck @ AnandTech (http://www.hardwarecanucks.com/forum/reviews-articles-web/25964-radeon-5970-overclocking-vrm-temperature-bottleneck-anandtech.html)

geokilla November 27, 2009 04:15 PM

Radeon 5970 Overclocking: The VRM Temperature Bottleneck @ AnandTech
 
AnandTech

So it seems that the 5970 can clock even higher if the VRM temperatures can be lowered. That thing must put out a ton of heat.

ayah November 27, 2009 05:35 PM

Doesn't help that each core in the 5970 doesn't come with "full" VRM banks making each individual phase work harder.

BobbyLou November 27, 2009 06:41 PM

good thing ill just be gaming on mine then XD

ontariotl November 27, 2009 10:24 PM

Doin some testing on mine today and noticed Crysis studdering from time to time. I did a furmark test and sure enough, my GPU1 throttles back after a few minutes.

Looks like its time to watercool.

SKYMTL November 28, 2009 07:20 AM

This could also be by Far Cry 2 shows somewhat lackluster performance results.

Oh, and its not only overclocking: people are being held back @ stock clocks / voltage as well.

geokilla November 28, 2009 08:09 AM

Seems that the stock cooler isn't do its job very well, despite it having a vapour chamber in there. And here some thought the 5970 wasn't doing too well cus of crappy drivers.

Zero82z November 28, 2009 10:00 AM

Quote:

Originally Posted by geokilla (Post 293639)
Seems that the stock cooler isn't do its job very well, despite it having a vapour chamber in there. And here some thought the 5970 wasn't doing too well cus of crappy drivers.

The problem seems to be that the GPU1 VRMs aren't actually being cooled by the vapour chamber. The GPU2 VRMs are being cooled by it and have much lower temps.

Chilly November 28, 2009 10:03 AM

Quote:

Originally Posted by geokilla (Post 293639)
Seems that the stock cooler isn't do its job very well, despite it having a vapour chamber in there. And here some thought the 5970 wasn't doing too well cus of crappy drivers.

The cooler does its job just fine, its the second set of VRM's that aren't even connected to the main heatsink assembly thats the issue.

Kind of a silly oversight in my mind.

gerardfraser November 30, 2009 07:54 AM

Well I did a little testing and its only one card
GPU 1 and 2 5970
GPU 3 285GTX

Max temp on core with extreme burning mode was 80.5 C
Max temp on Vram was 99C extreme burning mode can do upto 120 before it effects anything.

Now this is my card and how it runs on extreme burning mode.
My advice turn up fan speed and for any gamer this will not be an issue.



Heres the screen shots.
http://img687.imageshack.us/img687/474/myth2.jpg


link to higher quality screen
http://img28.imageshack.us/img28/474/myth2.th.jpg

Postumus November 30, 2009 06:50 PM

So many conflicting reports on the whole downclock/won't oc "well" thing =\ . Perhaps water is the way to go on these things.


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