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Try to look in the mining forum, topics named "Hardware comparison" or "Hashing speeds"

A lot of rejected shares today on the pool, is everything ok?

Well the administator is Eduffeld, the creator of the coin. You can find him on this forum too or on bitcointalk

Well if a block is found within the estimated time, the difficulty will rise. So if, by chance, has power lowers but blocks are found in the estimated period of time, the difficulty will not decrease as expected

difficulty today reached an insanely high level (8.000 and above). I can't get about anything with a rig of two 280x cards...

Try with an older version of catalyst drivers, maybe 13.12 which works great for me. I own a Gigabyte 6850, which is almost old as your card, and got no problems so far

I was wondering the same...how can difficulty be so insanely high? The DRK price has lowered a bit in the latest days, so what's going on?

Actually about the CPU, but it's the same for the laptop

At current difficulty, you should have a decent amount of hashing power to get a profit. I don't think a CPU could work

Which version of sgminer are you using? Driver version?

Thank you man, I will give this a try

Could you post your calculations here?

I'm getting a lot of rejected shares today...problems on the pool?

Problems on the official pool also today?

WU is Work Utility. It's not the same as scyrpt, you have to divide your hashing speed by 72 (actually is 72,xx) to geet your W.U. 0.109 is correct for your speed

Pick the one with darksend

Try to change the port

Thread concurrency and shaders together are useless, just use one of them. Try to lower clock and memory speed and check if anything changes

Yes you can mine with your GPU and CPU, just need to use different miners. Nvidia cards are not so great for mining, AMD is much better. For overheating, Darkcoin algos are different from scrypt, the consume less power and run much cooler

Thanks yibble, my account is now working. Thank you very much for your help