Thanks man, you're a star. This combination has completely fixed my problems. I'm now getting 395kh/s out of both cards before even trying shader unlocking or overclocking.

Brilliant.

I'll try this later today and let you know...thanks!

No time to play about with linux for the first time, till the new year

I'd say using a pool is a good idea with any cryptocurrency mining. At least you have a steady income.

If you're trying to decide which coin to mine, well that's a little more complicated. It all depends on how much risk you are willing to take.

Thanks for your help guys. I will update this thread if I get any difference with Linux. Will take me a couple of weeks to find the time though with the holidays coming up.

GPUZ indicates overclocking works. But it has little to no effect on my hashrate. Tried 825-950 gpu clock, with voltage increases upto 1.2v. The cards got hotter but it didn't help.


Yeah that was a typo I have the DS3R too.
PCE slots run at 16x for one card or X8, X8 for 2 cards.

Other than trying Linux (which is going to take a while for me learn), I am really out of ideas. I think I'll just have to settle with what I've got unfortunately. They were ebay cards, £220 for 620kh/s isnt too bad I guess.

I also tried each card on it's own. Same sub par hashing speeds.

Could it be something to do with the motherboard or ram? I am just reusing old hardware here, didn't really research the best components.

q6600@3ghz
Gigabyte EP45- ES3P
4Gb DDR2
700w PSU

Also, has anyone actually compared hash rates with windows 7 x64 and a linux distro?

Cheers, will grab that later. I put Ubuntu on earlier via a windows install....no idea what Im doing. I was stumped at installing the catalyst driver. Much reading to do.


Well, I'm still not really happy. People seem to be routinely getting 400+kh/s with 6950's without much difficulty. I can't get any higher than ~315 per card, and not really any idea why. Over clocking didnt make much difference. Too top it off one of my cards (gigabyte HD6950, reference board i think) runs super hot so it crashes easily. The other is a Sapphire HD6950 Dirt3 edition, much better cooling but it wont unlock the shaders after flashing. I'm just not having much luck.

At the moment it seems I'll have to accept 630kh/s is the most I will get out of the cards. Thanks for the link, I've been there earlier today, it did help quite a lot.


Yeah, I managed to unlock the extra shaders on my Gigabyte card, but it seemed to negatively effect the hash rate by about 10%. I've read that sometimes the extra shaders just aren't very good. Perhaps this is one of those cards that didn't quite make it as a 6970.

Gah, what a frustrating day. Girlfriend is pissed at me for sitting in front of the computer all day

Nope just mining, fresh install with bear minimum software and drivers on.

I'm going to have to do a Linux dual boot to compare I think. Is Ubuntu a good idea for a noob?

Best numbers I've seen all weekend. Thank you.

With some overclocking I might reach 395kh/s per card.

I will try and work out if those linux variable are relevant for windows thanks. Actually that gives me another idea....try linux. I'm even more clueless when it comes to that thought.

Intensity all the way up to 20 only gives a max of 600kh/s for the pair. 

Hi Guys,
I've been having a number of problems setting up a litecoin mining rig.
I'm currently running a q6600 rig with 4gb DDR2 and 2x HD6950 cards.  First thing I did was a fresh install of windows 7 64bit. Installed the latest ATI drivers 12.10 (SDK 2.8 ). Then I tried to configure cgminer 2.10.0 and Reaperv13 beta. I did try unlocking the shaders and overclocking the 6950's (up to 925/1350, 1.2v), but since I've been having trouble I've gone back to stock settings.

Here are the configs I've been using:
Reaper litecoin.conf:
host coinotron.com
port 8322
user xxx
pass xxx
protocol litecoin
worksize 256
aggression 16
threads_per_gpu 4
sharethreads 18
lookup_gap 2
gpu_thread_concurrency 5632

Cgminer:
cgminer --scrypt -o http://coinotron.com:8322 -u xxx -p xxx --shaders 1480 --intensity 18 --worksize 128 -g 1 --thread-concurrency 8192

Ok so the first big problem is that I'm getting quite low hashing scores from these cards. Between 290-300kh/s from each max, total 600kh/s(from both cgminer and Reaper). The Litecoin hardware comparison (http://wiki.litecoin.net/index.php/Mining_hardware_comparison) indicates I should be getting another 100-200kh/s per card from these babies. A little disappointing.

Second problem, I read that using catalyst 11.2 and SDK 2.5 may give better performance. I installed these, and then found that both cgminer and reaper couldn't start the Opencl kernel and refused to mine (same configs). In fact the only way I could fix this at all was to just reinstall the catalyst 12.10 driver package. Messing about with the drivers was also frustrating, crashing, blue screens and install failures all over the place.

Third problem, one of my cards seems to be 'unlockable', guess that's unlucky. The other card unlocks the extra shaders then performs about 10% less in mining hashrate. Guess the extra shaders are not any good. (Probably no solution to this one but I just thought id moan about it anyway)

Is there anyone out there who can help me? I've just spent most of the weekend trying to get better performance to no avail

I plan to switch to a couple of 6950's soon. Will be interesting to see if I have the same problems....

I'll try out that pooler miner too, thanks.

Hi, I'm kinda new to mining in general and hoping someone can explain an observation I've seen with using litecoin pools.

I've got 2xGTX 570's. Not ideal I know, but I settled on using cgminer for these. NVIDIA cards don't seem very well supported in the other mining software options.

The cards are nicely hashing along at a 200kh/s rate in cgminer. But when I look at the hash rate stats for my pool (any pool, not just burnside) the hash rate throughout the day is mostly much lower...say 50kh/s. I have seen the stats reporting 150kh/s from these cards occasionally but usually not for very long.

Can anyone explain why this is? My stale percentage is low <10%.

I'm puzzled.

Cgminer config is :
cgminer --scrypt -o http://ltc.kattare.com:9332/ -u XXX -p XXX - --shaders 480 --intensity 13 --worksize 128 -g 1

*I've also noticed that mining with the CPU via scryptminer GUI can often produce a higher hash rate in the stats than my GPU's, something is just not right.

Just wondering...
Burnside, can we have more than 1 computer per worker?

Well, if you ordered early you still get it early. The 1/3 shipping thing only applies to orders made in the first month of selling. The rest of the orders are on a first come first serve basis.

They to hope to receive their chips in the next 2 weeks. Then manufacture, 24 hour burn in, and shipping can begin. (we hope)

Sound like a great idea. I hope someone with the necessary skills can pull it off.

Hi its me Negcreep.

Nice to meet you all

A bit strict, but this is a good place to make my first post.