, my settings are 995 GPU clock, 1050 memory clock. 
Topic: Best way to overclock/underclock/over volt my Sapphire 6870, What tags? (Read 2589 times)
January 04, 2013, 08:24:22 AM
I'm getting 25 M/hashes more thanks to this thread , my settings are 995 GPU clock, 1050 memory clock.
, my settings are 995 GPU clock, 1050 memory clock. September 05, 2011, 08:47:50 AM
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.
-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.
September 04, 2011, 02:53:11 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.
September 04, 2011, 01:43:40 PM
you should use -w256 and underclock ram, there's a sweet spot that's faster than 128 and stock
-w128 works the best for mine! 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!
September 04, 2011, 11:38:46 AM
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.
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.
September 04, 2011, 11:31:32 AM
you should use -w256 and underclock ram, there's a sweet spot that's faster than 128 and stock
September 03, 2011, 10:43:36 PM
September 03, 2011, 09:30:41 PM
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.
September 03, 2011, 03:06:01 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.
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