2x5870 Win 7 64bit - cannot overclock

[phenom]

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

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[PhrozenArmadillo]

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?

[phenom]

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?

[LegitBit]

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.

[anodyne]

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

[doomy]

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.

[willphase]

I had exactly the same problem.  I ended up using the AMD GPU Clock tool and that let me change everything.

W

[phenom]

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.