Consolidated Litecoin Mining Guide for 5xxx, 6xxx, and 7xxx GPUs

[ChanceCoats123]

I switched over, but I'm still trying with cgminer. It seems to be working a bit better, but we'll see.

[MKEGuy]

I'm getting around 550KH/s on my Diamond HD7970 clocked at 1075MHz with cgminer ...

Same as I'm getting, nice find on the memory clocks. I just confirmed it is the same for me, memory clock speed doesn't change the hashrate for 7970.

Same thing here. I can't get past 550kH/s with my 7970.

No idea how others get 700kH/s and more.

Any ideas?

It comes with a good deal of overclocking and overvolting. On the right side of Afterburner you should see a little red dot.  You can click it and it will allow you to adjust core and memory voltage independently of one another.  BE VERY CAREFUL.  Small increases in voltage on your RAM can QUICKLY add LOTS of temp to your card if you do not have good cooling.

Unless your getting free or really cheap power this really should be more about efficiency then max hashrate.  Even at stock clocks I was pulling a ton of power, I can't imagine over volting.  When I reduced even down to just 1.025 I could drop over 200 watts across a 4 card rig.  That's huge.  Worry more about your kh/s per watt then your overall hashrate.  Again, this may change if you have free power or extremely cheap power.  But not many find themselves in this position.

The statement above about memory clocks not affecting hash rate are extremely incorrect.  Make sure you have afterburner setup correctly.  Use something like GPUz to confirm that you are actually changing the clocks.  Just watching afterburner display a different clock rate does not guarantee that you are really adjusting anything.  Just by the fact you believe that the memory clocks do not affect hash rate I can promise you that you are either 1) a troll or 2) do not have afterburner working correctly.  (add the dll's, disable ulps, oc mode = 2, etc, etc etc)

[luffy]

I'm getting around 550KH/s on my Diamond HD7970 clocked at 1075MHz with cgminer using the following settigs:

"intensity" : "13",
"worksize" : "256",
"lookup-gap" : "0",
"thread-concurrency" : "8192",
"shaders" : "2048",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",

One thing I have noticed is that memory clock appears to have absolutely *no* effect on mining speed.  This seems contrary to what other people have posted.  I've tried clocking memory up to 1575MHz (the max on this card) and down to 750 MHz and there only a few (2-3) KHash/sec variance.

Any suggestions on how to improve my hashrate would be appreciated.

i guess the 7970's use is not reaching 100% , does it?
if not just try to open a new cgminer (mining BTC) with a low intensity (4 or 5) and see if you got more hashrate in the LTC cgminer
or you may try to open a second LTC cgminer with same settings and see if the total hashrate is bigger

[DrG]

Anybody got settings for a 6950.  I have a 3 card setup and trying all kinds of speeds but cant seem to go past 314 or so.  Stock 820/1250 yields 314kh per card with 7040 concurrency and I 18 (1408 shaders not unlocked one).  I'm using 12.10 drivers under Win 7 x64 cgminer.  I have 8GB of system RAM but I'm not seeing how others are getting 400-500.  Heat is also an issue with the cards hitting 84c even with 65% fan.

Reaper is working great on my 7950s - getting a stable 635kh.

[malvino]

You should be able to see it in task manager.

What GPU are you using?

Here's a screenshot:



My card is a Club 3D Radeon HD 7850 royalKing 1024Mb

[MKEGuy]

Anyone running a 7970... dont be affraid to try CGminer.  I just did and now not only can I take advantage of the efficiency advantages of startum, but its actually hashing FASTER then Reaper at the same settings.  (except for thread concurrency obviously)

So stoked!

[flound1129]

Anyone running a 7970... dont be affraid to try CGminer.  I just did and now not only can I take advantage of the efficiency advantages of startum, but its actually hashing FASTER then Reaper at the same settings.  (except for thread concurrency obviously)

So stoked!

Agreed, my hash rates in cgminer have always been higher than with reaper.

I finally broke 600 kH tonight, with the following settings:

core clock: 925
mem clock: 1450

"intensity" : "13",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "0",
"vectors" : "1",
"shaders" : "2048",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "2",

[flound1129]

core clock 1000
mem clock 1475
same setting as above

This is on a Gigabyte GV-R797OC-3GD

getting me ~680

[tacotime]

These are great rates.  Can anyone tell me what the memory usage on card is?  A bug was recently fixed that allowed thread_concurrencies of >8192 but <12000 to be used in cgminer, so I'm curious as to what the thread concurrency actually is (probably either 8192 or 10240)

Can someone try --thread-concurrency 8192 and --thread-concurrency 10240 and see if they produce the same results? thanks.

[-ck]

Note I also improved on the kernel slightly too in the latest version.

[tacotime]

Note I also improved on the kernel slightly too in the latest version.

Ill give it a spin tomorrow with my 7950s and 6970s

[flound1129]

These are great rates.  Can anyone tell me what the memory usage on card is?  A bug was recently fixed that allowed thread_concurrencies of >8192 but <12000 to be used in cgminer, so I'm curious as to what the thread concurrency actually is (probably either 8192 or 10240)

Can someone try --thread-concurrency 8192 and --thread-concurrency 10240 and see if they produce the same results? thanks.

GPU-Z is showing:

Memory Usage (dedicated): 0MB
Memory Usage (dynamic): 1508 MB

I can't run with thread-concurrency at 10240 on cgminer 2.11.2.  I get:

 [2013-03-13 23:44:16] Maximum buffer memory device 0 supports says 536870912
 [2013-03-13 23:44:16] Your scrypt settings come to 671088640
 [2013-03-13 23:44:16] Error -61: clCreateBuffer (padbuffer8), decrease CT or in
crease LG
 [2013-03-13 23:44:16] Failed to init GPU thread 0, disabling device 0
 [2013-03-13 23:44:16] Restarting the GPU from the menu will not fix this.
 [2013-03-13 23:44:16] Try restarting cgminer.

[tacotime]

That's what I thought.  Does 8192 give you similar results to --shaders 2048?

[flound1129]

That's what I thought.  Does 8192 give you similar results to --shaders 2048?

Yes about the same.

Note I also improved on the kernel slightly too in the latest version.

Any thoughts on whether a win64 build would improve hash rates?

[flound1129]

Maxed my other card (Diamond 7970PE53G) out at ~615 Kh/s with the following settings:

Core clock: 890MHz
Memory clock: 1375 MHz

same cgminer config as above

It's amazing how small variations in core or memory clock (~5 MHz) can result in 100 Kh/s difference in speed..

[malvino]

Maybe must I try cgminer instead of reaper for my 7850?

[flound1129]

Maybe must I try cgminer instead of reaper for my 7850?

Post your reaper.conf here, you should be able to get at least 200-300 Kh/s on a 7850

[malvino]

Post your reaper.conf here, you should be able to get at least 200-300 Kh/s on a 7850

reaper.conf
kernel reaper.cl
save_binaries yes
enable_graceful_shutdown no
long_polling yes
platform 0
device 0
cpu_mining_threads 0

mine litecoin

litecoin.conf
host litecoinpool.org
port 9332
user user.1
pass 1

protocol litecoin

worksize 256
aggression 13
threads_per_gpu 1
sharethreads 16
lookup_gap 2
gpu_thread_concurrency 16500

[meebs]

TY man. Had a good idea of most of it, just wondering where they were getting profitability from.

its pretty easy actually...

for your hash rate.. calculate how many LTC you will get in a day... multiply that by the BTC exchange rate.

If you get 0.15BTC.. then you compare it to how many BTC a day you get mining BTC.. if that is 0.10.. you have a profitability of 150%

[-ck]

Note I also improved on the kernel slightly too in the latest version.

Any thoughts on whether a win64 build would improve hash rates?

Quite sure it will make absolutely no difference.