2 Cards Crashing My System

[IMJim]

Was hoping to get some advice on this........just installed a second and identical Sapphire r9 290x in my main PC.  Had first card running for a couple weeks at around 920 kh/s pretty stable and doable temps.  Installed second card and adjusted my config file as shown below.  After realizing I had to delete the bin file and reboot my PC, I had both cards running for about 10 minutes with the below config, both hashing at 920 kh/s.  First card was running at around 84 where before it ran around 75 while running solo.  10 minutes in and all hashing at good speeds, my PC restarts and then restarted again while trying to reboot.  Shut my pc power off for 15 minutes and all booted up fine.  Am thinking I got the card too hot or perhaps over pulled from the PSU but thought I would check with some more experienced miners.  Also after rebooting and without starting CGMiner again, I am getting the colored square blocks showing on my screen such as you see when you are running CGminer at full bore and trying to use the pc at same time.  Have never seen this happen while not running CGminer?

I am pretty sure I have a 1000 watt PSU but cannot get to the writing without removing.  I so have a good amount of hardware in the system though along with the 2 cards which leads me to believe I may need a new PSU to run both of theses cards?  Am also thinking I may want to upgrade the cooling fans on my cards from the stock to help with cooling and was wondering if anybody could suggest anything on this.

Here is my current config I setup for both cards..........


setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe -I 20,20 --worksize 256,256 --thread-concurrency 33792,33792 --gpu-engine 1040,1040 --gpu-memclock 1500,1500 --gpu-powertune 20,20

[tico988]

Hi,

I also have Sapphire R9 290X (21227-00-40G) and had same problems, until I decreased the thread concurrency - I wasn't able to run above 28000 at all so I decreased it to  22528, what results in highest possible hash rate (around 900 khps) and stable operation (22528 is multply of my GPU's shaders - 2816). I guess that not every single model of Sapphire R9 290X can run at 33000 TC....

Otherwise, 1000W should be enough, I'm monitoring power consumption of my rig with 2 290X GPUs at wall socket and it is between 600-700W.
Those cards can also run at quite high temperatures, 90°C-95°C is not critical.

I also had a lot of problems with power saving mode of cards, and you cannot make simple dummy plug, because those cards only have DVI-D output, no analog....everytime when card crashes I have to restart my comp twice, because after 1st forced attempt cards go back to power saving mode.