I'm not so sure it's the RAM.
I run 3 R9 290's on BAMT which is a 32 bit operating system, so even though I have 12GB of RAM in the system because it's a left-over board from an older computer of mine, only 2GB shows up as usable in the OS. I have no trouble at all with hashrates. I use the settings I suggested above...
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fi43.tinypic.com%2F2mdmdtw.png&t=665&c=NmzSBymT5XBdxg)
I run 3 R9 290's on BAMT which is a 32 bit operating system, so even though I have 12GB of RAM in the system because it's a left-over board from an older computer of mine, only 2GB shows up as usable in the OS. I have no trouble at all with hashrates. I use the settings I suggested above...
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fi43.tinypic.com%2F2mdmdtw.png&t=665&c=NmzSBymT5XBdxg)
I'm having tons of trouble with these nonce HW errors (on win 7). I'm putting a post together about them to seek help. I've got 32GB stuffed in a box, reduced from 5 cards to 1 card, and still getting loads of errors.
My question for you - based on your high outputs on your cards, is what is your setup here?
Could you provide specifics on what Motherboard, cpu, PSU, ram brand you're using? Also, what version of the radeon drivers, and are you using the amd app sdk or not? I know after 13.6/4 it was included in the driver package, or at least that's what I've read. Also, what cgminer version do you use? What bamt version? Are you using powered risers? I guess your mobo can't be too old if it has at least 3 pcie's.