Quote from: BigDaddyWooWoo on September 27, 2013, 05:42:44 PM

Quote from: Thirtybird on September 27, 2013, 02:05:59 PM

Quote from: Epeus on September 27, 2013, 12:41:40 PM

Quote from: MrJay on September 27, 2013, 09:10:13 AM

Try lowering the diff on your 6990, even try multiple threads on a lower intesity. Yes you get a slightly lower hashrate (difference on my cards is like 5-10kh/s) but you get less stales and a higher return, at-least that's what I have found anyway.

Thanks for your advise.

However, I do need the high intensity because this rig is also CPU mining XPM.
If I cut intensity below 18 the hashrate skydives, unless I stop the CPU miner.
The 6990 does 950 Kh/s on I 19, with CPU miner enabled it drops to 915.
Any lowering of intensity has a dramatic impact on the hashrate. (I 17 gives 600-650)
So, thats why I'm reluctantly pointing it at a LTC pool. High hashrate, almost no rejects, and my CPU is doing something usefull.

When mining scrypt, you need 1 core on your CPU "available" to get your best hashrate. It doesn't seem like it should be that way, but I discovered that when I was trying LTC on the GPU and CPU at the same time. The loss of 1 core on CPU was trivial compared to the hashrate lost on the GPU.

Lol I did not know this and thought you were full of hoowie until I tried it myself and it turns out sir that you know what you are talking about. I was having problems with hash rate on 3 rigs where I had been running my CPU on SRC and never made the connection until I read this. I was killing myself trying to figure out what the issue was. I freed up one core on each machine and TADA! back to normal. I say good on you. Thanks!

I tried CPU mining both XPM and QRK, found that while doing so, even with one or 2 cores left free (6 core processor), I was still way more likely to have my rig completly lock up and have to be rebooted, had 3 or 4 hard lockups in a day or 2 of trying to mine either cpu coin, had to hit the reset button each time ... doesn't seem to happen when I use the cpu to mine scrypt based coins (can do roughly 40KH/s on scrypt with 5 out of 6 core). Been debating overclocking the cpu for a bit better returns, but would want to upgrade my cooling before I try.