help setting up dual 6870 miner

[5stringer]

Both 6870s in a separate rig ( by themselves one at a time ) game and mine fine. But to put them onto the same motherboard makes GUIMiner say that both cards ( 0-0 and 0-1 ) can't connect to the guild. Says "Verification failed, check hardware! (0:1 Barts, 4bf7be6a, f51f9247,0ba1b2b2) and so on. on both cards. But in my gaming rig individually, they work fine.  Any help is appreciated.

[Trillium]

It could be a software problem: Can you mine in a pool with both cards correctly?

It could be a hardware problem:

- Your motherboard may not be able to supply enough power to both PCI-e slots (each rated 75w max) to each card --> get a better motherboard or buy risers with molex connectors spliced on
:and/or:
- Your powersupply is not sufficient. Test with another powersupply to confirm.


In terms of process of elimination I would first look at if pool mining works, then look at the PSU, and then by process of elimination if it still isn't working I would conclude motherboard limitation.

[5stringer]

1000 watt corsair. Both cards work on a bored with a single 2.0 slot and mine fine. I put them into the dual 2.0 x 16 mobo they show up under device manager. I have yet to try each card individually on the new system.

[asically]

Probably Windows disabled your GPU.

Try disabling ULPS via the registry:
Go to:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4D36E968-E325-11CE-BFC1-08002BE10318}]
Change "EnableULPS" to 0 under the keys that apply to your video card(s).
You should be able to tell which keys (0000, 0001, etc) apply to your video cards by looking through the keys for the DriverDesc or other information.

[5stringer]

Probably Windows disabled your GPU.

Try disabling ULPS via the registry:
Go to:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4D36E968-E325-11CE-BFC1-08002BE10318}]
Change "EnableULPS" to 0 under the keys that apply to your video card(s).
You should be able to tell which keys (0000, 0001, etc) apply to your video cards by looking through the keys for the DriverDesc or other information.

That didn't even make a change. I'm more curious of this now more than ever. As I stated before, these cards both work individually in another system, but not in this purposely built machine.

Thanks anyways.   

[Trillium]

You can download a batch file called ULPS_Configuration_Utility_v1.1.4 it is just interacting with those registry entries via a convenient GUI.

My experience with ULPS and multi-gpu systems is that it is only important when you are running dual-GPU cards eg 5970, 6990, 7990.

As for your 1000 watt corsair it could be 1 megawatt but the point I was making is that it might be faulty and you'd not be able to tell. The good news if it is faulty if I recall correctly that PSU has a 5 year manufacturers warranty...!

If you are skilled with electronics and there is absolutely no way to get a hold of another PSU for testing, you could make some static loads to stress the PSU, monitor the voltage on the rail(s) with a multimeter while you are doing it.

I remember seeing a long long time ago on some overclocking forum that a user had made a test rig for power supplies that used a large number of switchable halogen (DC voltage) bulbs to stress the PSU, some of those things can be 75 watts or more EACH.