OK community
Claymore GPU0 = MSI AfterBurn 1:CardXXX (that means GPU3 in Claymore is MSI AB 4:Cardxxx)
So if you're having problem with let say GPU6 in Claymore, in the MSI AB select the card 7:Cardxxx and SPIN THE FAN to 100%
you will know physically what card it is!
Special thanks to Xeridea and Call_Me_Bambi
Thanks for the thanks

Just to let you know I tried the tip I suggested about switching a card off in Claymore and watching what hapens in AB, and for me it worked.
When I switched off a card using Claymore then in AB the clocks throttled back to the idle setting, now one thing to note is that I don't get a 1:1 correlation with Claymore & AB, i.e. Claymore 012345 does not equal AB 123456, this maybe because I'm mining Monero with Claymore CryptoNote v9.7 miner, with AB 4.4.0 beta 16.