Print Page - 6990 1K/Khash tutorial - ultimate mining machine

Title: 6990 1K/Khash tutorial - ultimate mining machine
Post by: merred on December 05, 2013, 05:06:51 PM

Hello Guys,

I have experimented a lot with my first 6990 and I now got a tutorial for the 6990 owners.

Driver:
13.5 Beta 2
AMD SDK

Uninstall current drive with Driver Sweeper (reboot option)
Install 13.5B2 WITHOUT CCC.
Install MSI Afterburner

Undervolt in MSI Afterburner to 1110

Clock settings we will use (don't change this in MSI, cgminer will adjust it)
Core speed: 940
Mem speed:1370

cgminer bat:

Code:

setx GPU_MAX_ALLOC_PERCENT=100
cgminer --scrypt --thread-concurrency 8192 -o stratum+tcp://xxxxxx:3334 -u xxxxxxx -p xxxxx --gpu-engine 940,940 --gpu-memclock 1370,1370 -g 1 -w 256 -I 18

Result:
1K Khash
1.5% reject

I will add screenshots and links to this tutorial this evening.

Donations welcome.

Title: Re: 6990 1K/Khash tutorial - ultimate mining machine
Post by: Syth on December 21, 2013, 11:46:55 PM

Hey,

Did you ever continue this guide?

I was trying to undervolt my ASUS HD Radeon 6990 to the 1110, it shows as 1110 in MSI AfterBurner but doesn't change in cgminer.

Title: Re: 6990 1K/Khash tutorial - ultimate mining machine
Post by: rocketron on December 22, 2013, 12:01:09 AM

these settings seem very familiar lol, because I told you them ;D 8)

Title: Re: 6990 1K/Khash tutorial - ultimate mining machine
Post by: Syth on December 27, 2013, 04:19:49 PM

I get 950-975Kh/s with 0.54% RJ's using these settings:

Code:

@echo off
Del *.bin
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer -o <serverIP:port> -O <user:pass> --thread-concurrency 9824 -w 256 --config cgminer.conf

And the important values from the config file is:

Code:

"intensity" : "18",
"gpu-engine" : "871",
"gpu-memclock" : "1400",
"gpu-powertune" : "0-20",
"lookup-gap" : "0",
"auto-fan" : true,
"auto-gpu" : true,

feedback would be great, would love to hit 1k with this beast.

EDIT: forgot to mention that the OC-switch on the card are switched to the normal 1.120v

Title: Re: 6990 1K/Khash tutorial - ultimate mining machine
Post by: sitefive on December 27, 2013, 04:24:41 PM

what kind of powersupply you got for your 6990?

Title: Re: 6990 1K/Khash tutorial - ultimate mining machine
Post by: Syth on December 27, 2013, 04:40:36 PM

Quote from: sitefive on December 27, 2013, 04:24:41 PM

what kind of powersupply you got for your 6990?

I'm currently using a 1300w for the 6990 and a 5770, but I think they could run with half as much.

The 6990 can draw 375 W on full load. Not sure if it applies to the normal mode(1.120v) or the "Uber Mode"(1.175v) though.

Title: Re: 6990 1K/Khash tutorial - ultimate mining machine
Post by: Boombashot on December 27, 2013, 04:48:21 PM

Does any1 know config settings for the HD 7850? I have 305 kh/s now, seems to be the max?

Title: Re: 6990 1K/Khash tutorial - ultimate mining machine
Post by: berryzat on January 26, 2014, 07:27:21 PM

”” 960 only afthe putting switch in position 1, i will observ the stability
CGwatcher is used

Title: Re: 6990 1K/Khash tutorial - ultimate mining machine
Post by: princecash on January 26, 2014, 09:00:15 PM

Thank you for your settings, can you please help with radeon saphirre 7850 1G setting because i am not seeing anything.

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