3 x 6990 mining rig, need help

[merred]

Hello guys

I'm trying to setup a 3 x 6990 mining rig, but windows won't detect more than two.

my motherboard is a Asrock 970 Extreme 4

I have tried different riser combinations (1=> 16 powered / 16 => 16 non powered).

SDK 2.7
Catalyst 12.8 and 13.1
Win7 64

Please help..


Update,
I now have 3 cards running, but my old settings for 2 cards won't work.
I can't get thread concurrency to 8192
I can't get intensity higher  than 17

What's going on? I upgraded ram to 8GB.

[Wilhelm]

Did you use the jumperwire on your PCI slot when using a riser?

Tutorial that uses your mobo and 7950 cards instead of 6990
http://www.cryptobadger.com/build-your-own-litecoin-mining-rig/

[mattopia]

Have you read this?  

http://www.gobitgo.com/articles/1001/How-To-Correctly-Use-and-Install-PCI-E-Riser-Cables/

As I understand it, when using 1x risers, you sometimes need to jumper two pins on the motherboard socket.

[Wilhelm]

Have you read this?  

http://www.gobitgo.com/articles/1001/How-To-Correctly-Use-and-Install-PCI-E-Riser-Cables/

As I understand it, when using 1x risers, you sometimes need to jumper two pins on the motherboard socket.

Correct in most mobos it's needed. Quick and easy to do but you need good eyes

[merred]

I'm not familiair with that. Thanks for the share.
According to someone it's because windows doesn't support more than 4 GPU (i have 6).
According to someone else it's because my mainboard doesnt have enough lanes.

[merred]

Do you guys also think that it's one of the above issues? Since 3x 6990 is 6 GPU..

[Spiffy_1]

If you're using windows 7 you'll only detect 2 cards.. Max for windows 7 is 4 GPU's from what I've heard..  Each card is 2 GPU.  If you want to run all 3 cards you'll need to go to linux or windows 8.  It sucks but it is what it is.

[merred]

Okay I got it working now after some switching.
However CGminer is bugging now...ill keep trying.

[merred]

Okay it seems that I need to install CCC or otherwise my VNC screen is black..great.

[merred]

New update:

3x6990 are detected by Windows
But when I run cgminer I first got a crash (atical.dll)
And when I run it after a reboot, I get the next error;
enqueueing kernel onto command queue. (clenqueuendrangekernel)


I only have intensity 16 set in cgminer bat.
Everything stock.

[merred]

Okay now I lowered my thread concurrency from 8192 to 5000 and intensity from 18 to 16 (these settings ALWAYS worked on 2 cards).

Cgminer is finally working but i'm receiving 50% HW.

[merred]

[rocketron]

those are rather low specs for 6990, I get 500+ from each gpu on my 6990s,

use msi after burner to undervolt them to 1110, (just change the voltage nothing else) set custom fan speeds of about 85%

try my cgminer settings

GPU_MAX_ALLOC_PERCENT=100
cgminer --scrypt --thread-concurrency 8192 -o stratum+tcp://xxxxxx:3334 -u xxxx -p xxxx  --gpu-engine 940,940,940,940,940,940 --gpu-memclock 1370,1370,1370,1370,1370,1370 -g 1 -w 256  -I 18 --scan-time 15 --expiry 30

[merred]

those are rather low specs for 6990, I get 500+ from each gpu on my 6990s,

use msi after burner to undervolt them to 1110, (just change the voltage nothing else) set custom fan speeds of about 85%

try my cgminer settings

GPU_MAX_ALLOC_PERCENT=100
cgminer --scrypt --thread-concurrency 8192 -o stratum+tcp://xxxxxx:3334 -u xxxx -p xxxx  --gpu-engine 940,940,940,940,940,940 --gpu-memclock 1370,1370,1370,1370,1370,1370 -g 1 -w 256  -I 18 --scan-time 15 --expiry 30

I got stable +1K hash per card when I used two cards.

But three cards changed that story  .
I have no idea why. Even "thread-concurrency 8192 " won't let CGminer start.

[rocketron]

another thing to note is the drivers,

make sure you do not install the ccc suite, you only need to driver and not the control centre.

use atiman uninstaller to remove the drivers if you have already installed the catalyst suite.

the latest 13.11 beta drivers work well

[merred]

another thing to note is the drivers,

make sure you do not install the ccc suite, you only need to driver and not the control centre.

use atiman uninstaller to remove the drivers if you have already installed the catalyst suite.

the latest 13.11 beta drivers work well

CCC is not installed. This is 13.11 indeed.


When I use a higher thread concur or intensity I get:

-cgminer won't start at all
-cgminer starts with following error;
enqueueing kernel onto command queue. (clenqueuendrangekernel)

And this while 2 cards gave me a stable +2K hash rate.

[merred]

Is 2GB ram enough for 6 GPU's?

[rocketron]

whats the rest of your spec? how much main memory have you got ? powersupply?

I had 4x6990s running on my rampage iv extreme x79 at one point with no probs, cpu i7 3970x, 64 gig ram, 1600watt psu

[rocketron]

Is 2GB ram enough for 6 GPU's?

as a rule of thumb, i usually match the system ram with the gpu ram, so say 2 x 6990s is 8gb, so system ram min would be 8 gb

[merred]

Is 2GB ram enough for 6 GPU's?

as a rule of thumb, i usually match the system ram with the gpu ram, so say 2 x 6990s is 8gb, so system ram min would be 8 gb

So that might be the problem..because starting CGminer can take like on minute before it actually does something?
And sometimes it doesn't start but the black CMD box stays empty.


Wow 4 x 6990 really? In windows?


My setup;

Asrock 970 Extreme 4
Sempron 145
CM Silent Pro 1500W
2GB RAM