I ground around the edge of me block because if i messed up the grinding i could make a new block straight away. If me hand slipped taking of the shim i might ruin me good graphics card.
So it seemed the safest option for me to grind the block.
I did notice a 4C reduction in temps with the better contact.
The contact wasn't that bad with the shim on as i had it bolted down very well.
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