3 x 6990 mining rig, need help

[rocketron]

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

[merred]

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.

[rocketron]

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

[merred]

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.

[rocketron]

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

[GeneralJabroni]

Any chance I can revive this thread? 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.