Topic: 5870 Users! Clock Speed, Memory, Voltage, SDK and CCC Version, Flags, etc. - page 4. (Read 22437 times)

Yes switching the onboard graphics has really helped my mhash performance.   Ive also speculated that instead of onboard perhaps a small pci hd3000 series or something would also suffice since they are both ati you shouldnt have much trouble with the drivers.   The only thing with windows i believe you will have to have dummy plugs for the adpters or the catalyst won't let you use them or configure them and im not sure what the performance would be with a dummy card as well.

That's pretty darn good. Perhaps I rushed my overclock too much (that's what school does to you : /), seeing as how you got their on stock voltage. And using onboard graphics is a great idea, I wish my mobo had that as well or I would have already tried it!

Just for a comparison I run 2 5870s at stock voltage 990 core, 800 mem.  Its a gigabyte and if i run it below an 800 mem clock it tends to wig out, or crash.   Currently im running  Slackware 13.37 stream 2.1 sdk, 11.4 catalyst and am averaging about 420 mhash/gpu.   none of the 5870s are connected to a monitor currently I use onboard gpu for my graphics, and it seems to work much better without tieing down one of the cards to the gui. 

Yeah, I believe your ideal mem clock depends on what your core clock is at.

And I had the same issue with sdk 2.1. I need to look into that more (can't wait for finals to be done).

If I increase or decrease mem clock performance decrease, I don´t remember trying 185 will try. The one time I tried to install sdk 2.1 opencl didn´t work.

When I tested memory clocks 180MHz-185MHz had the highest increase in speed for me. I do need to adjust core clocks so I'll likely end up adjusting memory clocks as well.
The problem is I can't get aggression=13 to run without crashing yet, even with my relatively high vcore. As soon as finals are over I'm going to try and optimize this as much as possible, and that's why I'm looking for some info from the experienced people around here.

Have you tried SDK 2.1 at all? Nice speeds their, beating me by ~15 at the same core clock.

Try this, set your mem clock to 300 and on the bat file remove fastloop and add aggression=13. With sdk 2.4 and 980/300 i´m getting 415Mhash/s.

Just looking for some discussion on optimizing the 5870 and pushing it to its limit. I'll try and update my first post with really useful information for those running 5870's as well. Also looking for advice on mine.

My setup is is two 5870's. I'm using MSI Afterburner to configure both of my cards independently. To adjust voltages and lower memory speeds really low you have to edit the MSIafterburner.cfg file like so

I have one at 980MHz core 180MHz memory and 1.2v and another at 960MHz core 180MHz memory and 1.2v core. Temps stay bellow 80 depending on how much I crank up the fan.
My .bat file to start the latest phoenix miner using slush's pool looks like this.
I'm using CCC 11.4 and SDK 2.4.
Each card pulls ~400Mhash/s at these settings in windows 7. I have a Core i7 at 3.8GHz and 6GB DDR3 RAM.

What works best for you guys? Mine clearly isn't ideal and I need to adjust it, I'd also like some input on that..
I've heard using -f 1 or -f 0 can increase your output quite a bit, how's that work for everyone?
What voltages are people running at? I had a hard time getting this stable and went up to 1.2v, but I see people with a lot less. I can't even get my aggression above 7 atm, above that it is likely to crash. I've heard SDK 2.1 is the best, but how does it compare to 2.4? I removed 2.4 and installed 2.1 and my client wouldn't pick up both my cards. Does anyone use their crossfire bridge while mining? I did a short test and couldn't find a difference in productivity, and it's easier for me since this is my gaming system as well.
If anyone needs dummy plugs here's the guide to make them http://www.overclock.net/folding-home-guides-tutorials/384733-30-second-dummy-plug.html.