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Author Topic: GPU memory speed  (Read 2496 times)
glitch003
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January 08, 2012, 11:43:25 PM
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I know reducing the clock speed of your GPU memory can save power, but does it also effect the thermal properties of the card?  Meaning, if I underclock the memory of the GPU, will the GPU run cooler?

Thanks!

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grue
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January 08, 2012, 11:51:24 PM
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yes, and it will hash faster too.  Shocked

It is pitch black. You are likely to be eaten by a grue.

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January 08, 2012, 11:56:36 PM
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yes, and it will hash faster too.  Shocked

this. My 5830's are set a 980/300/1.16v/78C and getting 315 Mh/S using Trixx

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January 09, 2012, 04:13:48 AM
 #4

yes, and it will hash faster too.  Shocked

Not always, I clocked mine to around 600mhz, and I got some very low mh/s, then I changed it to around 850mhz and I mine at 220mh/s from one card..

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January 09, 2012, 12:52:38 PM
 #5

yes, and it will hash faster too.  Shocked

Not always, I clocked mine to around 600mhz, and I got some very low mh/s, then I changed it to around 850mhz and I mine at 220mh/s from one card..
thats because you didn't clock your memory down to 300mhz. its a magic number, try it.

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P4man
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January 09, 2012, 01:05:11 PM
 #6

I know reducing the clock speed of your GPU memory can save power, but does it also effect the thermal properties of the card?  Meaning, if I underclock the memory of the GPU, will the GPU run cooler?

Think about it.. what heats your card? Electric power. The less power it draws, the less it will heat up. The memory controller is on the GPU, and much of the savings come from there, its not only in the RAM chips. So yes, the GPU will run less hot by a few degrees at least.

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January 09, 2012, 06:09:17 PM
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There are a few sweet spots. For my 5870's it's 180Mhz and 450Mhz (a bit better). Anything different soon becomes worse than 180Mhz! Why, I do not know!
thats pretty interesting, i would suggest we create a table similar to the mining_hardware one -- with underclock ratings for all the cards & best found values, flags used, o/c used etc etc

i would also love to find a definitive list of all the various flags for use in poclbm, cgminer, diablo, etc

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January 09, 2012, 06:23:54 PM
 #8

Someone already made a chart of that, but Ill damned if I can find it. IIRC the bottom line was that ~200-400 MHz was the sweetspot, performance tapering off slightly in either direction

luo demin
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January 09, 2012, 06:28:30 PM
 #9

It depends on your card my 4850 would crash below 450mhz and the 6770 I had let me get down to 300 the lower it is the cooler your card will run
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January 09, 2012, 06:30:28 PM
 #10

Someone already made a chart of that, but Ill damned if I can find it. IIRC the bottom line was that ~200-400 MHz was the sweetspot, performance tapering off slightly in either direction
i found a chart but it only showed that 300mhz was the spot & only for one card.
i was thinking a table with many cards & values..
http://smpake.com/data/img/5770mem.png

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P4man
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January 09, 2012, 06:33:48 PM
 #11

Thats already a useful chart, but not the one Ive seen.
I dont think it will be very different for other cards; afaik all popular mining cards use the same basic shader architecture, so I would expect very similar results.

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January 09, 2012, 08:10:35 PM
 #12

I usually set mine for 333 MHz on a 5870 !
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January 10, 2012, 05:22:10 AM
 #13

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bravetheheat
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January 10, 2012, 10:45:35 AM
 #14

Actually, for me there's only a tiny difference between a high memory clock and 300mhz (though with the higher clock, I get like 2 or 3 extra mh/s). But it would be better to keep at at around 300mhz, as others have said, it lowers your temps slightly and might even increase your mhash!
zulufighta
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January 10, 2012, 12:28:08 PM
 #15

Actually, for me there's only a tiny difference between a high memory clock and 300mhz (though with the higher clock, I get like 2 or 3 extra mh/s). But it would be better to keep at at around 300mhz, as others have said, it lowers your temps slightly and might even increase your mhash!

That is only for 5870s and 5xxx series mostly. I think the 6xxx series can only go down to 900 mhz on the memory.
glitch003
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January 10, 2012, 06:20:36 PM
 #16

Is 300Mhz ideal memory speed for a 5830 as well?

P4man
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January 10, 2012, 06:29:07 PM
 #17

Is 300Mhz ideal memory speed for a 5830 as well?

Yeah. Its the same chip as the 5870 and 5850 just with some parts fused off.

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January 10, 2012, 07:49:21 PM
 #18

I drop a few degrees C by underclocking my memory. 
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January 10, 2012, 08:49:30 PM
 #19

360Mhz is the sweet spot for my 3 5870's
glitch003
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January 10, 2012, 10:31:51 PM
 #20

yes, and it will hash faster too.  Shocked

this. My 5830's are set a 980/300/1.16v/78C and getting 315 Mh/S using Trixx

Interesting.  I just downloaded trixx and I like it more than the AMD VISION OC.

What flags/software are you using to get 315Mh/S, what OS (windows/linux), and what's your fan speed (%)?

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