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Temperature wise its a mixed bag - on some GPUs it seems to actually hinder cooling - on mine however it is good for around 3C drop in temperature (with normal air cooling in typical room temperatures) which is nice but not that useful.
I do like them from an aesthetic perspective though.
nope....
780, 780ti and titan all used the same back plate.
the backplate only make contact with the 12 ram ic's on the back of the pcb on the titan, on the 780 and 780ti the back plate just sits there looking nice. if anything it may insulate the card putting temps up. but it cant cool what its not touching.
Most of the time it doesn't add anything other than looks. Unless you have a heavy card they it may add some support the the PCB stopping it flexing too much.