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which 7950?

Heatsinks on the Accelero 7970 version seem fine to me. They are just blocks of alloy that you glue on. Tbh I'm not sure how else they could be improved other than making them out of copper they fit and do the job perfectly.
 
Iv'e used them for years and rated them very highly, but the vrm cooling especially on the 7970 Extreme is nothing short of abysmal, especially if your heavy overclocking.

Full fan speed AC v's ~24% AC fan speed:

tommybhoy said:
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.


161a31bb625ea514b0941ead25b8c569.jpg


f115459b39117215aa04a0fe23246629.jpg
Click to expand...

:)
 
I will check my VRM temps later, tbh anyhting under 100.c on the VRM's will be fine. They will get ruddy hot if you up the voltage. 1.2v+ will run them very hot no matter what heatsinks you use. The limit on them is 125.c.

I do like that above heatsink though it looks cool..
 
Last edited:
:cool:

Youv'e not tried one on a low Asic 79 then?

Try between 1.25/1.3v's.:eek:

The tiny extreme sinks couldn't cope at all and went to 95c almost instantly then would start to climb, without any volts on stock 1.175v.

I know they are rated for 125c, but I bottled it@105c and stopped at that, although I had a 4870(my first Amd GPU) with an accelero that hit 137c degrees on the vrms and it still runs today on a pc.

It took affair amount of abuse until I added a Zalman vrm heat sink which took it down to ~75c-that's how you make a heatsink.:D
 
For what its worth in a pm the AMD rep said to try and keep them below 90c.

I try to keep them below 80c personally.

Hot VRM's are what cause artifacts for me.
 
rolypolyman said:
Yeh, I'm the same, whenever I get a new card I spend a day or two benchmarking with Heaven for comparisons only. Here is what I did today:

Gigabyte WF3 7950 bought last week (from competitor).

At stock (900\1250) 0.967v 35%fan, max temp 51c, vrms 55\56c
OC (1250\1250) 1.25vAB,1.219vGpu-z, 47%fan, max temp 64c, vrms 65\66c

Heaven Score : FPS= 63.4/80.7 OC
Scores= 1596/2034 OC
Min FPS=40.5/47.9 OC
Max FPS=137.6/171.2 OC @ 1920X1080 4XAA 8XAnistropy Normal Tesselation.

I did get 22secs at 1301\1250 @1.29vAB, 1.248vGpu-z in Heaven before it bugged out, shame thought I was gonna get the magic 1300. You will notice that Afterburner(which I was using to OC and up the voltage( version 2.2.0 with the unlocker cheat added) reported different voltages from Gpu-z, I dont know which one was accurate.
So I am guessing my GByte WF3 7950 does not have the voltage locked.
Hope this helps some of you folks come to a decision on a card, I certainly dont seem to have any issues with temps, vrms, voltage etc.:D
Click to expand...

Good stuff mate. Got one of these babies sitting at home waiting for me so this gives me something to work from (never really tried OCing much).
 
The Giga is the one I'm waiting to drop to the £230 mark, then it will be in my basket. Come on OCUK, i'm sure you can do that. *im sure it was £239 earlier but I must have overlooked it, I refreshed the page and it went back to £259 :( .
 
tommybhoy said:
:cool:

Youv'e not tried one on a low Asic 79 then?

Try between 1.25/1.3v's.:eek:

The tiny extreme sinks couldn't cope at all and went to 95c almost instantly then would start to climb, without any volts on stock 1.175v.

I know they are rated for 125c, but I bottled it@105c and stopped at that, although I had a 4870(my first Amd GPU) with an accelero that hit 137c degrees on the vrms and it still runs today on a pc.

It took affair amount of abuse until I added a Zalman vrm heat sink which took it down to ~75c-that's how you make a heatsink.:D
Click to expand...


Sorry if i am wrong but asic is voltage leak it your GPU and has nothing to do with you memory chips ??.
Allough my gigabyte with an asic with only 69 will do 1200/1550 @1.35 volts 65 deg gpu and 78 deg mem, wich flies in the face of all i have read :confused:
 
LtMatt said:
For what its worth in a pm the AMD rep said to try and keep them below 90c.

I try to keep them below 80c personally.

Hot VRM's are what cause artifacts for me.
Click to expand...

After having a fiddle, I can confirm that VRM temps above 95C start to cause artifacts. Pushing 1.2V into my 7950 pushed them to 105C after 10 seconds at which point I stopped the benchmark! I noticed also that after 90C the core voltage according to gpuz dropped a bit and stayed low, which caused artifacts and instability.

Turns out they're quite a limiting factor. Or they would be if my card didn't run so hot anyway, forcing me to stay at 1.1v and 1100/1250 to keep my fans below 65% :/
 
rally**** said:
Sorry if i am wrong but asic is voltage leak it your GPU and has nothing to do with you memory chips ??.
Click to expand...

Yes, correct, but I'm talking about the vrms-the main one in regards to power delivery to the core.

rally**** said:
Allough my gigabyte with an asic with only 69 will do 1200/1550 @1.35 volts 65 deg gpu and 78 deg mem, wich flies in the face of all i have read :confused:
Click to expand...

Having a low Asic, doesn't mean it won't clock, it will, if anything it can achieve a higher core clock under water than a high Asic equivalent.

The low Asics need a lot of v's for their maximum potential to be released.

The above is all dependant on the chip lottery first and foremost remember.
 
rolypolyman said:
Yeh, I'm the same, whenever I get a new card I spend a day or two benchmarking with Heaven for comparisons only. Here is what I did today:

Gigabyte WF3 7950 bought last week (from competitor).

At stock (900\1250) 0.967v 35%fan, max temp 51c, vrms 55\56c
OC (1250\1250) 1.25vAB,1.219vGpu-z, 47%fan, max temp 64c, vrms 65\66c

Heaven Score : FPS= 63.4/80.7 OC
Scores= 1596/2034 OC
Min FPS=40.5/47.9 OC
Max FPS=137.6/171.2 OC @ 1920X1080 4XAA 8XAnistropy Normal Tesselation.

I did get 22secs at 1301\1250 @1.29vAB, 1.248vGpu-z in Heaven before it bugged out, shame thought I was gonna get the magic 1300. You will notice that Afterburner(which I was using to OC and up the voltage( version 2.2.0 with the unlocker cheat added) reported different voltages from Gpu-z, I dont know which one was accurate.
So I am guessing my GByte WF3 7950 does not have the voltage locked.
Hope this helps some of you folks come to a decision on a card, I certainly dont seem to have any issues with temps, vrms, voltage etc.:D
Click to expand...

Oh and forgot to mention the Asic on this card is 77%.:)
 
I cannot read my VRM temps on this XFX card ? I can on my reference 7970 they show up in gpu-z but nothing shows on the XFX 7950 any ideas ?
 
rolypolyman said:
I never touch the memory as I've read it doesn't make much difference and not worth the hassle. And I'm pretty sure I dont have access to the memory voltage.:confused:
Click to expand...

My memory runs at 6000mhz on stock volts but tbh I cannot notice any difference at all other than a few points in benchmarks.

Same for the core really it runs 1200 with 1.1v but I run 1000 on stock volts and cannot tell the difference only in benchmarks.
 
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