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Author Topic: Underclocking ATI Memory to reduce heat??  (Read 7845 times)
zombo
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June 15, 2011, 03:43:13 AM
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Hi I heard about underclocking my ATI's memory to reduce heat. I have 2x 6870's and they are sitting at about 75 celcius ( is this too hot? )

I was wondering how do I go about underclocking the memory?

Right now my Core is at 950 (overclocked) and memory is at stock and cannot be set lower in the catalyst control center.
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ND
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June 15, 2011, 03:46:08 AM
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Install MSIAfterburner and enable ati overdrive on catalyst control center panel. Then use Afterburner to downclock your memory (You can overclock on afterburner if you want, no need to use the catalyst control center.

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eddd
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June 15, 2011, 03:54:59 AM
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I haven't noticed any decrease in GPU temperature via underclocking memory.

However, when I underclock my memory down to 300mhz, I gain around 10mh/s - this is on my ATI 4850.
zombo
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June 15, 2011, 04:21:13 AM
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Strange how you gained, thanks for MSI afterburner its working great Smiley Underclocked memory about 300 mhz and increased clock to 980 Cheesy pulling 300mhash per card !!
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June 15, 2011, 04:34:34 AM
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Is a known fact that undercloking the memory to 300 can raise the mh/s.

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shata
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June 15, 2011, 06:30:58 AM
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Strange how you gained, thanks for MSI afterburner its working great Smiley Underclocked memory about 300 mhz and increased clock to 980 Cheesy pulling 300mhash per card !!

Im pushing 369mhash using 940/685 on 6970 2gb card, and yes underclocking gave me about 10-15mhash depends. Also heat went down about 2c.

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June 15, 2011, 07:42:43 AM
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I am able to get a pretty constant 370-380 Mh/s with my 5870 running the clock speed at 900mhz, the ram at 900mhz and the fan at 100%.  I generally hover around 71 C.  I am just using the CCC AMD Overdrive software.  I am not sure if underclocking the ram really does anything or not. for heat, but I do it anyway.

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duffy22
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June 15, 2011, 07:46:12 AM
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im running 2x5830's and reducing the memory down to 300mhz helped a lot with the heat.  Took the cards from low 80's down to low 70's.
IronTomahawk
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June 15, 2011, 07:48:53 AM
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MSI Afterburner works fine for multi-gpu configurations. But you couldn't reduce the memory clock enough I think. On 2 rigs of mine you could only sink the memory clock to ~50%.

If you have a single gpu-setup (5870 in my case) you could sink memory clock with "AMD GPU CLOCK TOOL" to about ~180 MHz which was optimum in my system. Funny thing is that performance of the gpu raises when you sink the memory clock. I tuned a while and the best was finally 180 MHz for memory, the 5870 now makes 420 MHash/s and takes about 45 Watt less, messured this with a Watt-Meter.
helikatze
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June 15, 2011, 07:49:01 AM
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I'm using a Sapphire 6870 with 980GPU and 300mem settings and I'm getting 280Mh/s with the temp hovering in around 70c.

Underclocking the memory gave me a total of maybe 1-2 degrees lower temperature.

No increase on the Mh/s here....
:-(
IronTomahawk
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June 15, 2011, 07:51:29 AM
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I'm using a Sapphire 6870 with 980GPU and 300mem settings and I'm getting 280Mh/s with the temp hovering in around 70c.

Underclocking the memory gave me a total of maybe 1-2 degrees lower temperature.

No increase on the Mh/s here....
:-(
Give "AMD GPU CLOCK TOOL" a try. Real performance gain happens at ~180 MHz for my 6870s, the make about 305 MHash/s. Do you raised your GPU-Clock? If not raise it by 3% and let it run for a while, than test 4% and so on. Than you will make the 300.
bgalakazam
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June 15, 2011, 08:26:57 AM
 #12

I have a HD 5770 and can only underclock memory to 650 in MSI Afterburner and 1200 in CCC.

Help?

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helikatze
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June 15, 2011, 08:28:11 AM
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I'm using a Sapphire 6870 with 980GPU and 300mem settings and I'm getting 280Mh/s with the temp hovering in around 70c.

Underclocking the memory gave me a total of maybe 1-2 degrees lower temperature.

No increase on the Mh/s here....
:-(
Give "AMD GPU CLOCK TOOL" a try. Real performance gain happens at ~180 MHz for my 6870s, the make about 305 MHash/s. Do you raised your GPU-Clock? If not raise it by 3% and let it run for a while, than test 4% and so on. Than you will make the 300.

I'm working with an 80Mhz increase on my GPU (It was 900Mhz out of the box).

If I go more than 1000Mhz  I see little difference on the Mh/s increase and huge on temp. I will give a try with a different miner (poclbm right now). Maybe that will do the trick.
IronTomahawk
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June 15, 2011, 08:28:58 AM
 #14

I have a HD 5770 and can only underclock memory to 650 in MSI Afterburner and 1200 in CCC.

Help?
As you can read some lines above: AMD GPU CLOCK TOOL
bgalakazam
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June 15, 2011, 08:30:12 AM
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As you can read some lines above: AMD GPU CLOCK TOOL
Thank you so much.

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benzz
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June 15, 2011, 08:40:03 AM
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i would imagine you would use less power therefore less heat, or even if that doesnt work use up the extra free power to increase the core clocks for a more powerful miner
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June 15, 2011, 09:45:54 AM
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Tried to underclock Memory on Asus EAH5850(725MHz) with AMDOverdriveCtrl 1.2.0 (ubuntu 10.10) but maximum stable values that I get:
GPU 885 MHz
Memory 620 MHz
if overlocking GPU to 890MHz or underclocking Memory to 600 MHz - it freezes completelly in several minutes...
So runing now with settings above - got 325Mhash and 69-70 celcius
Do anyone have an idea - can I get much performance? Or it is the ceiling values for me?

kripz
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June 15, 2011, 09:56:53 AM
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Is a known fact that undercloking the memory to 300 can raise the mh/s.

Anyone know why this is?

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IronTomahawk
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June 15, 2011, 09:59:43 AM
 #19

Tried to underclock Memory on Asus EAH5850(725MHz) with AMDOverdriveCtrl 1.2.0 (ubuntu 10.10) but maximum stable values that I get:
GPU 885 MHz
Memory 620 MHz
if overlocking GPU to 890MHz or underclocking Memory to 600 MHz - it freezes completelly in several minutes...
So runing now with settings above - got 325Mhash and 69-70 celcius
Do anyone have an idea - can I get much performance? Or it is the ceiling values for me?


I could not imagine, why to low Memory clock stucks the gpu. I think you gpu core clock is still to high. Overclocking is not an exact thing, you need time to find stable values. My 5850s do only 820 MHz without raising the vcore. Another thing is your power source. Don't think that you are good if you have a 500 watt source in your machine. You have to take a look at the values: 12V+, how many Amps you can take there? A single gpu should not be a problem, but 2 or more ... - surely.

Give AMD GPU CLOCK TOOL a try, set memory to about 180 MHz and core clock to 850, let it run for 2 days and your have a good start.
XPiRX
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June 15, 2011, 10:10:51 AM
 #20

Is a known fact that undercloking the memory to 300 can raise the mh/s.
Where is your proof/evidence of this?  I'm running a 5870 with 950 core overclock and 1300 memory overclock which I lowered back to stock since it produced no increase in gaming performance or mining performance. I lowered the memory down to 800, 600, and 300.  Each time I gained no MHash/s, I actually lost about 1-2MHash/s each step I took down. I gain probably 1-2Mhash/s when I overclock to 1300 which isn't a big enough gain to bother with the extra heat. I'm using aftermarket cooling however (Artic Cooling Accelero Xtreme) so my temps max out at around 48-50 for all sensors overclocked (don't even see heat increase/decrease for memory with changes).
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