Bitcoin Forum

Hi, everyone

I used to mine with cgminer  sapphire 7950 3GB with boost usng scrypt. With the settings below card could get about 650 kH/s

old computer: intel q6600, 4gb ddr2

Here are my settings:
setx GPU_MAX_ALLOC_PERCENT 100
cgminer.exe --scrypt -o stratum+tcp://stratum.give-me-ltc.com:3333 -u x -p x -o stratum+tcp://us.wemineltc.com:80 -u x -p x -I 19 --lookup-gap 2 --thread-concurrency 20480 --worksize 256 --shaders 1792 --gpu-engine 1110 --gpu-memclock 1500 --expiry 1 --queue 0

I moved the card into another computer but I'm having problems setting concurrency. These exact settings are not working. When I set concurrency above 12000 cgminer gets me this error:

Error -5:Enqueueind kernel onto command queue. (clEnqueueNDRangeKernel)
GPU0 failure, disabling!
Thread 0 being disabled

With concurrency so low I get bunch of HW. I also tried to lower memory and gpu engine clocks to stock value but result is the same.

new computer: intel G465, 2GB DDR3.

Is it possible that I don't have enough system memory? Btw right now this computer has 1.2 GB unused memory.

Any ideas?

A lot of system memory is not required for cgminer.

could it be your lookup gap went to 1 ?
(it basically use 2x the amount of video memory compared to lookup-gap 2 ... but at thread-concurrency arround 20k, it does not use your 3GB of memory anyway)

Or do you have some other video card in your new PC which could be used instead of your 7950 ? (even an integrated one)

Also, no other instance of cgminer running in the background ? (happened to me ^^)

There is not another instance of cgminer in the backgroud lol. I also thought maybe it's about drivers...I tried few versions with no effect.
I tried increasing lookup gap to 3-4 and I can set higher concurrency but my hashrate never goes over 350kH/s.

I have integrated graphics so I'll try to enable it maybe it helps

Dont remember the numbers but 2G ram is not enought for scrypt mining, 4G should be fine... it's somthing like 1.6G per 7950 card.. and 2G isnt enougth for system and one card

I had the same problem recently for some reason i found that thread concurrency is tied to system ram when you start cgminer so that error will show if your system ram inst high enough i suggest 4gb or more of ram for now 8960 should work for concurrency until you get more ram

also for best results your concurrency should be a multiple of the number of shaders you have

tnx guys tomorrow I'll buy extra 2GB of ram and give it a try

Did you move from windows 64 machine to a 32 machine?

if we want to reduce clutter then


THIS IS THE WRONG AREA OF THE BOARDS FOR YOUR ISSUE.

7950's are NOT an alternative crypto currency!

moderator move the thread.

fucksakes.

if you are going to abuse the forums, you deserve to be penalized. this is why you were made to wait 4 hrs and post a bunch before you were given permission. there's some responsibility involved you know.

If he is using KHS it is an alt currency issue.  And this is where the mods have been pushing these type of questions dipshit.  Read the forums a little more.  And quit spouting off your fat lips.

Dont see anythign about KHS in his post, but i guess we're about to find out.

Here I'll help you....this is from the first paragraph.....

I used to mine with cgminer  sapphire 7950 3GB with boost usng scrypt. With the settings below card could get about 650 kH/s


If you don't agree with policy bring it up with John K, because he is the one that has been moving them if they are not bitcoin related.

yes. should I install 64bit?

The problem occurs only on scrypt mining when concurrency is required.

Now I set integrated as main graphics but problem is still there

With win 32 you can't go as high.  Start at 8192 and ad 2048 increments.  I use 14336 on my windows 32 machine and can get 650khs when litecoin mining.  Or you could install 64.  Up to you.

Could someone confirm that this is true for cgminer ?
I remember reading somewhere that another mining software (guiminer maybe ?) needs loads of system ram, but I have a 7950 and cgminer use less than 20MB (be it windows 7 64 or linux).

Each "thread" from thread-concurrency use around 128kB of *video* ram at lookup-gap 1 (and you divide this by lookup-gap if it is greater than 1)

downloading 64 right now

Probably best choice.

win 7 64 installed....same problem

gpu 0 failure, disabling
thread 0 being disabled

mabe it's really low RAM?

If you delete all .bin files from your CGMiner directory and type "cgminer --scrypt --benchmark" does it still crash?

completly same :(

It's almost definitely the low ram, system overhead + GPU allocation for a memory intensive algo

Try AMD's driver removal utility (http://sites.amd.com/us/game/downloads/Pages/catalyst-uninstall-utility.aspx) and load 12.8.

In a few hours we'll be sure.

Tnx everyone for your help

GSnak I'm on it ;)

Could be memory or driver.  If you install new driver you will need to completely remove old one.  ATIMan is one of the few utilities that does a complete job of removing ati drivers thoroughly.  AMD uninstall utility does not always work (didn't for me). It leaves orphans. ATIMan does take a long time however and it may be easier to reinstall OS.  You can google ATIman for more info.

so far I tried 13.4 and 13.6 beta. Downloading 12.8

with 12.8 driver i still get the same error. I hope it's just a RAM issue

I just bought 4GB of RAM and everything is working ok. Thanks guys for all your help

Reaper is the memory hog.  That program loves it's system RAM...

Sucks you had to try everything else first.  Thanks for keeping us updated.