I have put up a dedicated mining computer now, and I'm having a lot of problems with it, but I'll take one at a time. I am running GUIMiner
I'm getting this error message:
2013-05-11 16:26:06: Listener for "OpenCL Slush's": stratum.bitcoin.cz:3333 11/05/2013 16:26:06, Verification failed, check hardware! (0:0:Juniper, 2b5342eb)
PS: I tried running an OpenCL miner on BitcoinPool.com and I get the same problem:
2013-05-11 16:38:50: Listener for "OCL BCPool": bitcoinpool.com:8334 11/05/2013 16:38:50, Verification failed, check hardware! (0:0:Juniper, 74f69135)
I think the problem is in this end. I'll try to reinstall GUIMiner, but I don't think that it will help. I don't think it is the graphics card or the driver, because Phoenix works.
2 things:
1. "Verification failed, check hardware!" tells you that the issue is at your end. I had a similar issue. It was the drivers. My card was a MSI one and I kept getting that until I got the drivers from MSI. The card is also a non-reference design, so I shouldn't have bothered with ATI's latest drivers in the first place.
Yours could be a different issue. But you have to fix that one first before looking at getwork vs stratum etc.
2. Phoenix doesn't support stratum - only getwork. You can either mine using getwork (bad idea and 10% fee) or run the stratum proxy and connect your miners to the proxy.