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.