Bitcoin Forum

Hi there

I recently started mining alt-coins using my old GTX 275 card, and i read that cudaminer was the way to go with geforce cards.

I have managed to set everything up to the point that cudaminer starts and it all looks great. It mines at about 70Kh/s (yay.. -.-), but after a while (random intervals like a few hours, or a day) cudaminer suddenly reports an increase of about 100Kh/s, and prints the message "does not validate on CPU". Then i have to restart cudaminer for it to actually mine again.

Is this something that is normal? I checked the hardware guide on the litecoin wiki, and applied the options recommended there to cudaminer (-d 0 -i 0), and it autotunes my card to L60x6. (I have also tried to manually set -l 60x6 but this also freaks out after a while).

OS running: Ubuntu 12.10 64bit
Card: Geforce GTX 275 using current nvidia drivers and CUDA 5.5

I hope this is something that can easily be fixed, and thanks in advance if anyone can shed any light on this.

Do you happen to have window to try if it have the same problem?

Definitely not normal but i have experienced it with my old computer. My new computer do not even crash. It is Windows 7 64bits. Have you tried switching to windows? Have you installed the drivers? If so, is it installed properly?

I was hoping to avoid installing windows, as i have several things running on this ubuntu server. It is running headless by the way, i dont know if that can cause things like this?

I installed CUDA and the current drivers by using the deb repository from nvidias developer site, so it should be properly installed. Cudaminer also compiled without problems.

What pool are you joining in? If it's some huge pool, sometimes it's the case. I also have to restart my miners randomly at a day.

I have tried several pools, but mostly litecoinpool.org and give-me-coins.com.

hlotac,

What version cudaminer you are using? What full configuration -d 0 -i 0? MSI GTX275?

I have a problem:

cudaminer.exe -d 0 -i 0 -o stratum+tcp://stratum.mine-litecoin.com -O username:pass

Results
[2013-11-07 23:21:42] 1 miner threads started, using 'scrypt' algorithm.
[2013-11-07 23:21:42] Starting Stratum on stratum+tcp://stratum.mine-litecoin.com
[2013-11-07 23:21:42] Binding thread 0 to cpu 0
[2013-11-07 23:21:42] Stratum detected new block
[2013-11-07 23:21:43] GPU #0: starting up...
[2013-11-07 23:21:43] GPU #0: ►Z░t►Z░t with compute capability 0.0
[2013-11-07 23:21:43] GPU #0: interactive: 0, tex-cache: 0 , single-alloc: 0

p.s.
I am using MSI GTX275, Cuda 5.5, drivers 9.18.13.3165, cudaminer-2013-11-01

May you help?

Perhaps going on the older version and run a stratum proxy? Mine was quite stable with the older version and ran a stratum proxy.

cudaminer.exe -d 0 -i 0 -l F28x4 -C 2 -o stratum+tcp://ltc.give-me-coins.com:3334

Works fine :) Thanks for proxy idea  :)