Hi,

So here is my problem, I hope someone can help me out.

First of all, my rig is composed of 3 7950s at stock clocks with one 1000w KingWing platinum PSU. One video card hooked up to a display and the 2 others to a dummy plug. It is running on Ubuntu server 12.04, cgminer 3.1.1 with latest AMD drivers.

Everything is running without a glitch except when I go over an intensity of 17, problems start at 18. What happens is the card hooked to the external display runs fine and stable but the two others are throttled: once every approximately 10 seconds, they will drop from 515 kh/s to approx. 420 kh/s for a couple of seconds, and then get back to 515 in this particular exemple. I can easily get a single 7950 to 630 kh/s when overclocked but I am far from getting there with all my cards.

I suppose the problem is not one coming from the PSU since at stock clocks and intensity of 18, the power from the wall reads at max 815 w. I should have enough room.

It is neither a heat problems since the cards at those settings are running at 82 celcius max fans under 4000 rpms.

I thought this could be a driver issue, not letting me use 100% of all GPUs all the time to protect them... dunno. I didn't want to start testing bunch of drivers version since this would be really time consuming. Maybe someone knows of a version working better than others? Tried adjusting --gpu-powertune without much luck, though it seems to help a little bit...

No HW errors, rejected shares of 1 to 1.5%.

Any ideas of what would cause that?

Thanks for your help!

edit: export DISPLAY=:0, export GPU_MAX_ALLOC_PERCENT=100 and export GPU_USE_SYNC_OBJECTS=1 are all set.
here are the settings I use in this example: --shaders 1792 --thread-concurrency 21712 -g 1 --lookup-gap 2 --gpu-vddc 1.03
so nothing to fancy, just trying to get stable at high intensity... thx

Please God, NO.

we are not saying you charge a lot for usd   we say you pay little for wdc  if one converts  wdc to ltc than usd      he wil be ahead
going rate is 2.5 ltc to 100 wdc and you are with shipping of course  estimated 86 wdc ler ltc = 1.2 per 100 wdc

You can most certainly get Silver at spot prices online all day every day. I have literally 1000 ounces of the shit that I've bought in the last year all online...ebay alone was half of my purchasing

Don't get me wrong, I think coins -> metals is the future, I even had a post about it a few days ago. I'm just saying, don't spread misinformation

I dont get it, whats the point? if in the same trader you can do BTC/USD, LTC/USD and BTC/LTC, its a no brainer that the only think it do is to create a bot haven making profits from any small margin, here and there. There is just no chance for LTC value to go up alone in this way, because bots will keep it tied up to BTC while they make profits from those movements.

As i see it, the only way, that LTC/USD could have any importance if its done in a LTC/USD ONLY trader, like a mtgox only for LTC.

Anyone still solo mining?

200kHs worth going back to it at this difficulty?

Whats the difficulty at