Bitcoin Forum

I have a 6950 2gb.
Im using GUIMiner, and it's currently cracking at ~260MHash/s
How many MHashes/s should i expect with this card?

Give a look here: https://en.bitcoin.it/wiki/Mining_hardware_comparison

Lots of info there.  ;D

The list ranged from 200 to 500, idk where mine is supposed to fit in ._.

Well start out with the type of card you have.  6950 yes.  1Gb or 2?  Unlocked shaders or no?  Clockspeed of gpu?

This should help you to narrow it down.

Overclocked no? Settings? Phoenix or polcbm with guiminer?

I have 2gb, Shaders not unlocked, stock clock.
I have no idea which miner im using ._.

Try other miners too.  Like you I started out with guiminer.  I eventually moved to cgminer because it gives such good regulated control over temperature, over/underclocking, undervolting, etc.

By experimenting with different kernels and clock/volt settings I was able to get my 6770 up to the max hash rates I was seeing around the web.

Unfortunately my 6950 is running at 85 degrees atm =(
It doesn't look like ill be overclocking any time soon.

With that card you should be getting 300-340 at stock clocks I think.

Any chance you can teach me how to use cgminer?

Just go read up at cgminer thread

You're definitely not getting the maximum of mhashes you can get. My non-OC'd 6870 gets 280 mhash/s on cgminer. Before trying cgminer try to set the "extra flags:" in GUIminer. Try to set  -v -w128 -f1. Then if you're not satisfied try cgminer. It's definitely more difficult to use than GUIminer but you'll get used to it.

If you underclock the memory (not needed for BTC hashing) it greatly reduces the temperature.  You'll have to do some research and then experiment yourself.  For instance my card's stock clocks are 850 MHz GPU and 1200MHz memory.  I currently run 960/300 and my temp is around 70-75C.  By reducing the RAM speed you can run higher GPU speeds for the same or lower temperature.

You definitely don't want to run at 85C for any length of time.  At least aim for less than 80C.

Also, is your 6950 plugged into your motherboard or in an external rack?  If it's on your motherboard, leave your PC's case open.  This *greatly* improves airflow and reduces temperature.  This is what I do.  I leave the side panel off my PC all the time now.

At default clocks (800mhz core) my 6950 make like 325mhash/s with cgminer, pretty much same in Guiminer with -v -w128

And definitely underclock the memory, temperature will get lower. You can use MSI Afterburner for that (and remember that the first time you launch it you can go only to like 620mhz, then apply, close and launch again and go to like 300 and apply)