Bitcoin Forum
December 02, 2016, 10:19:14 PM *
News: To be able to use the next phase of the beta forum software, please ensure that your email address is correct/functional.
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Best way to overclock/underclock/over volt my Sapphire 6870, What tags?  (Read 2432 times)
celcoid
Member
**
Offline Offline

Activity: 94


View Profile
September 03, 2011, 07:06:01 PM
 #1

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.
1480717154
Hero Member
*
Offline Offline

Posts: 1480717154

View Profile Personal Message (Offline)

Ignore
1480717154
Reply with quote  #2

1480717154
Report to moderator
1480717154
Hero Member
*
Offline Offline

Posts: 1480717154

View Profile Personal Message (Offline)

Ignore
1480717154
Reply with quote  #2

1480717154
Report to moderator
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
TeaL
Jr. Member
*
Offline Offline

Activity: 56



View Profile
September 04, 2011, 01:30:41 AM
 #2

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. 

To live is the rarest thing in the world, most people simply exist.
Helpful? ~ 1D3674hkatc4qQBjioWniF6epCmvAEQ45S
https://deepbit.net/userbar/4de68def8161972437000002_f1c525313c.png
Free as in Freedom.
RyNinDaCleM
Legendary
*
Offline Offline

Activity: 1988


Legen -wait for it- dary


View Profile
September 04, 2011, 02:43:36 AM
 #3

Use this guide
Or Sapphire trixx

For flags; I use -v -w128 for all 5xxx/6xxx GPUs except 5830s!

iopq
Hero Member
*****
Offline Offline

Activity: 644


View Profile
September 04, 2011, 03:31:32 PM
 #4

Use this guide
Or Sapphire trixx

For flags; I use -v -w128 for all 5xxx/6xxx GPUs except 5830s!
you should use -w256 and underclock ram, there's a sweet spot that's faster than 128 and stock

vapourminer
Legendary
*
Offline Offline

Activity: 889

what is this "brake pedal" you speak of?


View Profile
September 04, 2011, 03:38:46 PM
 #5

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.
RyNinDaCleM
Legendary
*
Offline Offline

Activity: 1988


Legen -wait for it- dary


View Profile
September 04, 2011, 05:43:40 PM
 #6

Use this guide
Or Sapphire trixx

For flags; I use -v -w128 for all 5xxx/6xxx GPUs except 5830s!
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!

johnj
Full Member
***
Offline Offline

Activity: 154


View Profile
September 04, 2011, 06:53:11 PM
 #7


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.

1AeW7QK59HvEJwiyMztFH1ubWPSLLKx5ym
TradeHill Referral TH-R120549
n4l3hp
Full Member
***
Offline Offline

Activity: 173


View Profile
September 05, 2011, 12:47:50 PM
 #8

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.
Roddy5690
Jr. Member
*
Offline Offline

Activity: 40


View Profile WWW
January 04, 2013, 12:24:22 PM
 #9

I'm getting 25 M/hashes more thanks to this thread Smiley , my settings are 995 GPU clock, 1050 memory clock.

FreeFaucet.co.uk - Multi-Currency Faucet
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!