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Having very high reject rates with new rig running 2x r9 290 tri-x runni sgminer and 13.11 beta drivers. Bat file as follows

sgminer -o stratum+tcp://middlecoin.com:3333 -xxxx-p x -I 23 -w 256 --thread-concurrency 32765 --gpu-engine 1020 --gpu-memclock 1500 --gpu-fan 85 --temp-target 88 --temp-overheat 92 --temp-cutoff 98 --gpu-powertune 20

Can't get these cards running with cgminer at all.

Any suggestions?

"-I" is too high. Start with 18/19/20. Check the hahsrate/rejects/WU and settle for the best values (depends also on what server you're hashing).

GPU and memclock might be too high as well. safer settings are 947/1250 or 975/1350 or 987/1425. Let it run a while (day or two), see if anything goes sick/dead/off. Have a good PSU?

I have 4xr9 290 cards running those setting stable and no issues, strange these cards don't like it. Tried intensity lower keep getting display adapter failed message it runs perfectly for 10 mins thn get the error. Psi is good antec 850w.

I am no expert but I would think to run 4xr9 290 you need at least 1200w, preferably 1300w.

Gold standard minimum, go platinum it is worth the extra investment for security and piece of mind.

You could try to use ather bios to lower your watt, but you still need at least 1200W PSU.
https://litecointalk.org/index.php?topic=12830.0 to get better bios for 290, 290x
I am running 840KH at 250W with R9290, stock is 870KH at 300W.
840KH is with i=18, and 2% rejects.

I have upgraded bios on the 4 r9 290 cards just dropped intensity and decrease rejects to approx 3%. Do you know of any bios updates for the r9 290tri-x cards?

I have a antec platinum 1300w psu running the 4 cards. It would be drawing around 1500w at the wall. Is this safe to run long term?