Looks like the basic problem was running three cards side by side -- I removed the 6950 and repositioned the cards so the middle PCI-E slot is empty, and I'm getting the same total performance (~1Mh/s) as I was getting with 3 cards (and saving some 150W in the process). The 7970 is generating less than the 7950 but I guess that's down to it being at 13 intensity and TC at 8192 instead of 24000 -- any more and I get nothing but HW errors from it.

I got a Litecoin mining rig going yesterday using the excellent tutorial over at litecoin.info. So far things are going, and all three cards are active, but the performance numbers are puzzling.

The machine is set up as follows:
GPU 0: Radeon 7970
GPU 1: Radeon 7950
GPU 2: Radeon 6950

I looked up info on cgiminer.conf to get things going as optimally as possible, but I can't seem to get things going too well, because these are my numbers after a couple of hours' running:
GPU 0: 326 Kh/s
GPU 1: 324 Kh/s
GPU 2: 433 Kh/s

That's correct, the two 7xxx cards are less productive than the 6xxx card. I may not know that much about mining, but I definitely know that this is not normal.

These are the directives in my cgminer.conf:
-------------------------
"intensity" : "20",
"worksize" : "256",

"gpu-threads" : "1",
"vectors" : "1",
"lookup-gap" : "2",
"thread-concurrency" : "21712,21712,8000",

"temp-target" : "80",
"temp-overheat" : "85",
"temp-cutoff" : "90",

"scrypt" : true,
-------------------------

I must be missing something vital, does anyone have an idea what that could be?

Well, the proxy seems to work... just getting to this point was a bit of a pain so I'll stick with that for now.

Well, that would explain that. I'd love to use cgminer but it crashes on startup for me every time.

---------------------------
Problem signature:
  Problem Event Name:   APPCRASH
  Application Name:   cgminer.exe
  Application Version:   0.0.0.0
  Application Timestamp:   51c9ae1c
  Fault Module Name:   cgminer.exe
  Fault Module Version:   0.0.0.0
  Fault Module Timestamp:   51c9ae1c
  Exception Code:   c0000005
  Exception Offset:   000304ad
  OS Version:   6.1.7601.2.1.0.256.48
  Locale ID:   1033
  Additional Information 1:   0a9e
  Additional Information 2:   0a9e372d3b4ad19135b953a78882e789
  Additional Information 3:   0a9e
  Additional Information 4:   0a9e372d3b4ad19135b953a78882e789

Read our privacy statement online:
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If the online privacy statement is not available, please read our privacy statement offline:
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-----------------------------

Quick question -- I am using phoenix 2 which I got working properly yesterday. However it seems unable to connect on the stratum URL, and always goes back to the api2 URL as "backup", but the "my account" page hasn't shown any change in the past day despite the miner running at ~950 Mhash/h for the past 15 hours or so... is this normal? 

It's kind of ridiculous because I'm (literally?) going through every miner and every one of them has a show-stopper flaw... maybe it's because I'm running on Windows 8 Enterprise or something. The only one that worked in an expected way so far was 50miner with phoenix but it crashes and puts Windows into an unstable state after about 150 blocks.

I just tried CGminer and it crashes on startup. As does Diablo, and another one I tried earlier (can't remember which). I have to say it's a bit frustrating. The ones that don't crash give me really poor performance. Maybe I should just put plain 32-bit XP on the box and it'll be less "experimental".

So I set up my new mining rig today and it appears to be working, but the numbers I'm seeing in the summary tab of GUIMiner aren't making sense. Here's what I'm getting...



1. that second card (gigabyte1) is churning away at no blocks (huh?), or maybe it's working on the ones pooled under Default... not sure.

2. The thing that makes the least sense is that card Default is a Radeon HD 7950 while the gigabyte1 card is a Radeon HD 6950, so something's definitely not right here. I should be getting at least 450Mhash/s out of Default but it's just not happening. Even mining by itself the card doesn't get much above the numbers shown here.

Both cards are running with flags for dedicated mining operation. Does anyone know what's going on here?

Hello... looking for advice here (guess I'm still a newbie).

I have this mining setup: Intel i7, MSI X58 pro mobo, 1xMSI twin frozr II 6950 and 1xgigabyte HD 6950.

So I set up Kubuntu, pyopencl, fglrx-updates, etc. and mining is going on... with only one card. The second card is completely unrecognized, it's like it's not even there. I had the MSI card running before putting in the Gigabyte one so I know it's running. I can see the Gigabyte's cards are going so I don't understand why it's not even recognized.

The interesting thing, however, is that both cards work independently. So the cards aren't a problem, but I suspect there is some configuration bit I've missed to get both cards recognized. Anyone have any idea?..