Bitcoin Forum

Hey guys,

I have a single XFX 5870 on another machine and it overclocks fine.

I've got a new mining rig hooked up with 2 5870's and I cannot get past 900mhz on the core clock.

What's strange is that after editing the msi afterburner cfg to allow me to do this, this is what I see :

https://i.imgur.com/10mfW.png

Whatever changes I make is not applied.

I've tried different SDK, Catalyst and MSIafterburner versions.

Any ideas what could be causing this?

Thanks

Could you give a little more detail about the hardware configuration that surrounds your dual 5870 setup? Do both of your rigs share common hardware?

MSI 890FXA-GD70 890FX Socket AM3 8 Channel HD Audio Gigabit Lan ATX Motherboard
XFX 850W Power Supply
AMD Sempron 140 2.70GHz (Socket AM3) Processor
Corsair Value 2GB (1x2GB) DDR3 PC3-10666C9 1333MHz

I'll experiment with 1 card and see how it goes.

I'm assuming I should be getting 800+ MH/s out of these two together. Is that correct?

My solo 5870 is pulling 410+ on a really old system.

Btw, their not crossfired. Is it worth me crossfiring them?

When you edited the file you may have messed up the file permissions, try removing the config file and restarting Afterburner.

That should cause Afterburner to re-create the file.

Let us know what happens.

Is the second GPU active (connected to display/dummy plug)? Can you see either of them if you change master GPU in Afterburner?

This happened to me when I used an ATI card, after months of using/OC'ing a Nvidia card with Afterburner. Clean re-install solves it.

I had exactly the same problem.  I ended up using the AMD GPU Clock tool (http://www.techpowerup.com/downloads/1641/AMD_GPU_Clock_Tool_v0.9.26.0_For_HD_5870.html) and that let me change everything.

W

Problem solved, I had no idea about having to use dummy plugs. I've got'em crossfired for now until I decide to use a dummy plug or switch over to Linux.

Thanks for your help.