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Title: Low Mhash/s with 2X 6950 Post by: Islander92 on January 18, 2012, 10:36:28 PM Hey Guys !
I'm new to bitcoin mining, but I started with this rig : - 2X XFX ATI Radeon 6950 1Gb - AMD Phenom II X6 Black Edition 1100T @ 3.5Ghz - 1100W Power Supply - 8Gb Mushin RAM @ 1333Mhz (Tell me if you need more infos) I joined a pool (Deepbit.net), updated my drivers, installed GUIminer and I've setup my 2 miners (one for each card). I also changed my fan speed to 100% But with all this I get 510Mhash/s... Wich is really crap for this setup. Can you guys help me with that ? https://i.imgur.com/TJ0nI.png Title: Re: Low Mhash/s with 2X 6950 Post by: jake262144 on January 18, 2012, 11:30:21 PM Obviously, once you got mining going now is the time for overclocking and fine-tuning.
Read those to get yourself up to speed: GUI Miner thread (https://bitcointalk.org/index.php?topic=3878.0) Hardware subforum (https://bitcointalk.org/index.php?board=44.0) When in doubt, use the Search function && RTFM. Report specific issues here. Once you get familiarized with mining I suggest you switch to cgminer which is the most advanced miner currently available. CGminer thread (https://bitcointalk.org/index.php?topic=28402.0) If your machine is going to be used as a dedicated mining rig: (1) Never use crossfire. Make sure the crossfire connector is removed. (2) Don't overclock that CPU. You aren't going to need it. You might also opt to disable half of the cores - that will increase your power efficiency. (3) There's no good explanation to stick with Windows. Title: Re: Low Mhash/s with 2X 6950 Post by: asdf2121 on January 19, 2012, 12:25:24 AM temps... check it..
Title: Re: Low Mhash/s with 2X 6950 Post by: juggalodarkclow on January 19, 2012, 12:25:43 AM Another issue is probably the fact that you're using the new drivers, I rolled back to catalyst 11.11 but here's another option to rollback to the previous sdk https://bitcointalk.org/index.php?topic=56885.0
Hope this helps Title: Re: Low Mhash/s with 2X 6950 Post by: grue on January 19, 2012, 03:00:56 AM whatever you do, don't join deepbit, or for that matter, any pool that is too big. it can compromise the security of the network, and they're the pool with the highest fees!
Title: Re: Low Mhash/s with 2X 6950 Post by: luo demin on January 19, 2012, 04:10:36 AM -v -w128 -f30 use these flags for your 6950's and see what happens should be a significant improvement
Title: Re: Low Mhash/s with 2X 6950 Post by: Costia on January 19, 2012, 08:34:07 PM -v -w128 -f30 use these flags for your 6950's and see what happens should be a significant improvement +1 on this onei have a 5770 without any flags i got 130Mhash/s with -v -w 128 it jumped to 180 Title: Re: Low Mhash/s with 2X 6950 Post by: naypalm on January 19, 2012, 11:12:16 PM -v -w128 -f30 use these flags for your 6950's and see what happens should be a significant improvement poclbm rocks! I get ~330-350 out of each of mine. Title: Re: Low Mhash/s with 2X 6950 Post by: mmbregman on January 20, 2012, 03:36:08 PM -v -w128 -f30 use these flags for your 6950's and see what happens should be a significant improvement -f30 is a defualt flag on the GUIMiner. To get the best Hash rate you should use -f1 (from my expirince on 6950), though it makes the desktop a little laggy.Title: Re: Low Mhash/s with 2X 6950 Post by: Costia on January 20, 2012, 06:27:08 PM I use -f 90 or 120 so i can play SWTOR even while i mine
The miner runs and the background and gets throttled by the "-f 90" when i play Title: Re: Low Mhash/s with 2X 6950 Post by: squirrelman on January 20, 2012, 07:45:47 PM I use -f 90 or 120 so i can play SWTOR even while i mine The miner runs and the background and gets throttled by the "-f 90" when i play Thanks for posting that, I will have to remember to use that when I want to game rather than just shutting down totally. |
