A friend and I need a hand (Radeon 4xxx OpenCL woes)

[TurnThePhage]

Hi, all. I was originally hoping to post this in http://forum.bitcoin.org/index.php?topic=3878.0 but the newbie restriction is in place so I'm hoping I'll still get some help if I post it here.

My friend and I are both attempting to start mining via the GUI miner linked, but we can only use our CPU's--neither his Radeon 4850 nor my Radeon 4870 appear on the miner's drop-down list for OpenCL-compatible devices.

I've been doing some research this morning on OpenCL and ATI cards; apparently, the Radeon 4xxx series only has "beta-level" support for OpenCL, according to this list of compatible systems, etc. I'd think that beta-level support would be sufficient to mine, but I've downloaded and installed the 64-bit Windows 7 AMD APP (AKA ATI Stream) multiple times, to no avail--the mining application still fails to recognize the 4870, as does this GPU Caps viewer someone recommended in an old post I found.

Bitcoins in general seem like a fun prospect and, hopefully, a lucrative one, but I think I've exhausted all of my options. So, wise bitcoin sages: Are my friend and I SOL? Or are we still missing some vital driver or program?

Thanks in advance for any help you guys can give.

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[Agozyen]

I use a 4870 X2 and when I first installed Bitcoin and GUIMiner it recognized my card right off.  Then I started tinkering with things.  I downloaded ATI Stream 2.2 and that borked things up.  The thing is I don't ever remember installing Stream to begin with, separately that is.  It may have installed along with Catalyst or something.  Anyway, after GUIMiner stopped recognizing my hardware I had to uninstall everything related to ATI and reinstall.  So, get the latest drivers, uninstall your current CCC and Stream, resinstall CCC with latest drivers and see if that works.

[OCedHrt]

For best chances, you should use the ATI uninstaller and remove all the old versions first and then reinstall the newest Catalyst pack. This includes OpenCL. Be warned though after I installed 11-6, worksizes < 256 no longer work.

[TurnThePhage]

Reinstalling my driver to 11.6 worked like a charm; the miner now recognizes "ATI RV770" so I think I'm good.

EDIT: Okay, new problem. I ran the miner with -w128 as the only flag; it then used all of my GPU until it got to 118 C and crashed my computer. Now, every time I attempt to start mining, poclbm.exe crashes.

No pain, no gain, I suppose.

[OCedHrt]

Reinstalling my driver to 11.6 worked like a charm; the miner now recognizes "ATI RV770" so I think I'm good.

EDIT: Okay, new problem. I ran the miner with -w128 as the only flag; it then used all of my GPU until it got to 118 C and crashed my computer. Now, every time I attempt to start mining, poclbm.exe crashes.

No pain, no gain, I suppose.

Use worksize 256. I think it's a problem with 11-6 catalyst. Anything less than 256 and each miner only works once without vectors and once with vectors.