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Title: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? Post by: celcoid on September 03, 2011, 07:06:01 PM Hello I would like to find out how to get max Mhash on my 6870 should I underclock the memory? How High is it save to overclock at what voltages? What tags should I use? Im using GUIminer.
Title: Re: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? Post by: TeaL on September 04, 2011, 01:30:41 AM If you're using Windows, you should be able to modify core clocks, voltage, and fanspeed in the Catalyst Control Centre. As for underclocking memory, I don't use Windows so I can only recommend you search for a tool, perhaps someone else here knows of one.
Title: Re: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? Post by: RyNinDaCleM on September 04, 2011, 02:43:36 AM Use this guide (https://bitcointalk.org/index.php?topic=18102.0)
Or Sapphire trixx For flags; I use -v -w128 for all 5xxx/6xxx GPUs except 5830s! Title: Re: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? Post by: iopq on September 04, 2011, 03:31:32 PM Use this guide (https://bitcointalk.org/index.php?topic=18102.0) you should use -w256 and underclock ram, there's a sweet spot that's faster than 128 and stockOr Sapphire trixx For flags; I use -v -w128 for all 5xxx/6xxx GPUs except 5830s! Title: Re: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? Post by: vapourminer on September 04, 2011, 03:38:46 PM not exactly the same card, mine is an asus directCU 6870. stock volts, cant help there.
sdk 2.4, 11.6 drivers, guiminer with "-v - w 128 -f 20" @ 1010 core it pulls 300 MHs, temps are 70s with fan @ 75%, closed case. but I had to replace the stock thermal junk with artic cooling TX2. memory is about stock as this is the main "goto" computer in the house. Title: Re: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? Post by: RyNinDaCleM on September 04, 2011, 05:43:40 PM Use this guide (https://bitcointalk.org/index.php?topic=18102.0) you should use -w256 and underclock ram, there's a sweet spot that's faster than 128 and stockOr Sapphire trixx For flags; I use -v -w128 for all 5xxx/6xxx GPUs except 5830s! My 6950UL'd is at 935/1000 -w128 417Mh 2x 5830 990/450 -w256 315Mh each 3x 5770 1000/350 -w128 225Mh each 1x 5850 1000/400 -w128 400Mh I think these are pretty good results! Title: Re: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? Post by: johnj on September 04, 2011, 06:53:11 PM 3x 5770 1000/350 -w128 225Mh each I'm at 1000/300 -v -w256 @227Mh each. And using Phoenix I'm at 231Mh each. Not much different, just throwin that out there. Title: Re: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? Post by: n4l3hp on September 05, 2011, 12:47:50 PM Running 2 Sapphire 6870 at 310Mh/s (970/300). Was able to get 323MH/s at 1020/300 (1.25v) but consumed about 20w more per card.
-v -f 10 (got same performance with or without -w 256) I'm using the 890 IGP as primary video. Tried -f 0 but browsing with google chrome is a pain. The mouse cursor movement was a bit jumpy. Edit: There is also a 5670 at 112MH/s (1000/150) running with the 6870s using the same flags. Title: Re: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? Post by: Roddy5690 on January 04, 2013, 12:24:22 PM I'm getting 25 M/hashes more thanks to this thread :) , my settings are 995 GPU clock, 1050 memory clock.
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