Bitcoin Forum

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.

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/

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 :)

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.

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

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.

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

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

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.

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.

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.

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.

Is 2GB ram enough for 6 GPU's?

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

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

that was under linux mind you, but i did have 3 running in windows at one point too.

it seems to me you need to get some more system ram, its dog cheap anyway

Did I buy the correct RAM?

Mushkin DIMM 2 GB DDR3-1066,

if your system booted it should be ok, check your mobo specs.

you could also try input the ram timings manually in the bios

So the problems that occure when using high settings (these settings worked for 2 cards); thread 8192, i 18



CGminer crash;
Problem signature:
  Problem Event Name:   APPCRASH
  Application Name:   cgminer.exe
  Application Version:   0.0.0.0
  Application Timestamp:   5278f3b2
  Fault Module Name:   aticaldd.dll
  Fault Module Version:   6.14.10.1741
  Fault Module Timestamp:   501340a0
  Exception Code:   c0000005
  Exception Offset:   00008ea0
  OS Version:   6.1.7600.2.0.0.768.3
  Locale ID:   2067
  Additional Information 1:   0a9e
  Additional Information 2:   0a9e372d3b4ad19135b953a78882e789
  Additional Information 3:   0a9e
  Additional Information 4:   0a9e372d3b4ad19135b953a78882e789

CGminer error:
enqueueing kernel onto command queue. (clenqueuendrangekernel)



Or just a ticking CMD screen when nothing happens.

Also seems that it takes a lot of time before CGMINER actually runs.

I'll try more RAM now.

Now using 2 x 4GB Ram (kingston 1600 DDR3).
Still the same problem. It crashes and so on :(.



Problem signature:
  Problem Event Name:   APPCRASH
  Application Name:   cgminer.exe
  Application Version:   0.0.0.0
  Application Timestamp:   5278f3b2
  Fault Module Name:   aticaldd.dll
  Fault Module Version:   6.14.10.1741
  Fault Module Timestamp:   501340a0
  Exception Code:   c0000005
  Exception Offset:   00008ea0
  OS Version:   6.1.7600.2.0.0.768.3
  Locale ID:   2067
  Additional Information 1:   0a9e
  Additional Information 2:   0a9e372d3b4ad19135b953a78882e789
  Additional Information 3:   0a9e
  Additional Information 4:   0a9e372d3b4ad19135b953a78882e789

The best i can get working untill now is;


-I 17 --thread-concurrency 7040 --gpu-fan 100 --gpu-engine 880 --gpu-memclock 1250

i am out of ideas dude, what version of cgminer are you using? try 3.7.2

So you got 3 x 6990 running in windows with above settings?

I think i will switch in linux to give that a try.

Yes Catalyst 13.1 without CCC, Cgminer 3.7.2, SDK 2.7

For some reason, it only accepts low settings. Thread concurrency above 7500 = crash or no nothing happens.
Same for intensity above 17.
So i'm stuck currently with 2800khs for 3, which is not too bad..but I was getting +2KHS from 2 cards :(.
I'm now also getting a few HW errors..

By the way, BIOS switch 1 or default?

aslym mode ;) 880 mhz bios

Yes i'm in the same mode...
Grrrr  :'(

could also be your cpu not providing enough bandwidth to run the gpus, bear in mind I am running on X79 with a I7 3970X

cgminer will crash if you use too high of thread-concurrency and not enough ram to support the threads.  The reason why 8192 worked with 2 cards is because you are using less memory with 2 cards.  Adding two more gpu's with the thread-concurrency at 8192 and you are over allocating memory and cgminer wont start.  Simple as that.

Either run lower thread-concurrency with 6 gpu's or get more ram...

Also, you might benefit from reading about the internet.  All this info is freely available :)

Hello

Thanks for your message.

I have upgraded the ram from 2GB to 8GB.
Still not enough?

in my opinion you need 16+ for 4 6990s

Why is that?
I have only 3 x 6990



Shit looks like that i'm on AMD 12.8
I'll try 13.11 now.

According to someone it's my PSU

Which PSU did you use?

They are correct. Your GPU's require 750w each for minimum requirements (1000w for crossfire setup) which means your GPU's alone will need between 1750 - 2250w and then your sempron needs another 45w.

your wrong on specs,

my rig pulls 785watts from the wall according to me meter, 2x 6990s, so for a 3rd you can add about 350watts. so his psu is fine

Ok, then tell the companies that created his GPUs that THEIR specs are wrong, I am telling him the factory recommended system requirements for his make and brands for solo and crossfire set-ups.

the specs are quoted by manufacture for a recommended powersupply, not for actual power usage used by the gpu's! this is the misconception about powersupplies

wattometers do not lie!

heres a screenshot of the onboard power meter on my axx1200i for 2x 6990s

https://www.dropbox.com/s/jkzvbi07wkhnzqh/psu.JPG

1500 watt psu is more than enough for 3x 6990s

It's NOT the watts, I have plenty of Watts.
It's the Amps for each 12V line. I only seem to have 4 12V lines.

get yourself a decent psu then, something like corsair ax1200, or the evga supernova is a great psu

I didn't know my PSU wasn't decent..score 9.7/10
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=175
I will look for a second PSU of 450 W or something.

hold on sec, that psu has 8x12v rails with up to 120amps!!! each rail is 25amps

"class-leading eight +12V rails with 110A (Peak up to 120A)
-That's a lot of rails, but then again 110A is a lot of power"

theres nothing wrong with your psu m8, thats a very good one! and well capable of running 3x6990s

Any chance I can revive this thread?:P There seems to be good info here with knowledgeable people.

I'm trying to run 3x6990's on my rig as well but I'm getting strange results :'(

Sempron 140
Corsair 1200W (CMPSU-1200AX)
2x1GB RAM
Driver 13.12
SDK 2.9
CGminer 3.7.2
Win 8.1 x64

I'm currently running two just to see if I can make this work (and to rule out the PSU).

I can't raise the intensity of my cards past 11. When in 12, it will mine for a few hours, then just stop. Anything higher and it will last only about 2 mins.


What happens is that cgminer is seemingly doing fine for a minute or two, then all of a sudden the program freezes and CPU usage goes all the way up to 100%. No "ghosting" on the cgminer window or any error messages.

Windows itself doesn't completely crash but it becomes pretty unusable. If you move the mouse, you don't see the pointer move all the way, you just see it jump from place to place. Any input (keyboard or mouse) in this state takes about 20 secs to happen.


My batch currently is
cgminer.exe --scrypt -o stratum+tcp://uswest.wafflepool.com:3333 -u 1663f2rW79j9chkvwt783qv52ifEN7hDaP -p x --thread-concurrency 8192 -g 2 -w 1024 --temp-overheat 80 -I 11

It was mentioned by rocketron that I should NOT let CCC install but I can't figure out how to do that.

Suggestions? Comments? Concerns? Consolations :-[? Anything is greatly appreciated.