Bitcoin Forum
December 08, 2016, 02:10:47 AM *
News: Latest stable version of Bitcoin Core: 0.13.1  [Torrent].
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: GPU overclocking and core clock fluctuations and mem ratio  (Read 2270 times)
trueimage
Member
**
Offline Offline

Activity: 87


View Profile
June 04, 2011, 03:25:42 AM
 #1

Hi, just got 2x 6950 2GB already flashed to 6970 unlocked shaders

I am running GUIMiner with flags -v -w128 -f 0
I am running drivers 11.5b
Win 7 x64
Stock speeds on these cards are 800 / 1250

I've got two copies of GPU-Z running and they show a solid 800 mhz, 99% load, 1.1000 V

I installed MSI Afterburner, and the max it allows me for clock is 840, so I set it to this and tried every voltage up to 1.2000 V

The problem is that the clock speed fluctuates in GPU-Z down to 792 MHz and back up to 840 and a few in between. Is this because there is not enough voltage to keep it at 840 under 99% load?

I bought these from a friend and he had them under water cooling at 925 / 1250 @ 1.3v

Ok also, I've read a few posts about memory speed doesn't matter so clock it down to save power / heat / etc. And I've read references to using a ratio gpu : mem clock. Any tips on this?

Cheers.
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1481163047
Hero Member
*
Offline Offline

Posts: 1481163047

View Profile Personal Message (Offline)

Ignore
1481163047
Reply with quote  #2

1481163047
Report to moderator
gigabytecoin
Sr. Member
****
Offline Offline

Activity: 280


View Profile
June 04, 2011, 07:22:07 AM
 #2

If you can underclock the mem to 300mhz... you can probably squeeze 950mhz out of the core! Good luck!
accod
Newbie
*
Offline Offline

Activity: 12


View Profile
June 04, 2011, 07:51:21 AM
 #3

Open CCC and in the Performance section set the Power Control to +20%.  That should stop the fluctuations.

Beer fund: 129Sm8HD53T5dimz57GYAmtqDR7uJ6PJsA  Grin
Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!