Will Radeon 6970 & 7970 work on the same PC?

[rhubear]

I'm having a Radeon 6970 which was RMA'd back to company for fixing returned to me "upgraded"/swapped to an R7970.   

I have an existing R6970, so my mining rig will have 1 x 6970 & 1 x 7970 soon.

It seems like a good deal to me, however remember seeing in the cgminer "GPU Readme" (extract below) that a different version of AMD SDK is recommended for R79xx cards.

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Q: Which AMD SDK is the best for cgminer?
A: At the moment, versions 2.4 and 2.5 work the best for R5xxx and R6xxx GPUS.
SDK 2.6 or 2.7 works best for R7xxx. SDK 2.8 is known to have many problems.
If you are need to use the 2.6+ SDK or R7xxx or later
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Is this going to complicate matters for me?  Do I need to run (is it even possible to run) two versions of SDK?

I have Catalyst 12.8 installed.

However looking at the version number for the SDK on the custom install for Catalyst 12.8 shows SDK version 10.0.938.2, so I'm a little confused by the version numbers in the cgminer docs & AMD Catalyst.

Thanks for any feedback.

Rhubear.

[HellDiverUK]

I think it'll work OK, I had a 6970 and two 7950 running together in one machine with 12.8 on a C206 chipset board and a i3-3220 on Windows 7.  Board was an Asus P8B WS.

[Zanatos666]

SDK numbers it is referring to is for Linux systems, if you are running Windows then are worried about Catalyst version.  

The issue you will have with running two different series cards that require minimal driver versions is that its been seen that sometimes skipping up to the next series gives your older card a downgrade in performance.  For example, 5xxx series cards work best with 11.x series drivers, specifically 11.11 or 11.12.  If you step up to 12.x series drivers which are needed for 6xxx series cards, your 5xxx cards take performance hits.

Now I could be wrong and someone could suggest something else that would work, but I have always gone off the idea that you want to stick to the same series cards inside the same rig.

[rhubear]

thanks for clarification regarding numbering system.

I'm guess pcs  running different series cards is a compromise, but still works.

I always thought it was best to run the same series cards in 1 pc.

thanks for the feedback guys,  let's see how I get on

[polarhei]

CAN work as the result is just summing up at last

[ssateneth]

yes

[jdbtracker]

It'll work beautifully, I had multi-gpus in my rig and they worked fine... but I just couldn't overclock the different model cards that were installed under the main pci-e slot, but they showed up on catalyst and worked great... well they're going to support litecoin now.