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I don't know how they would be able to tell, unless you mean the built on heat spreader?
there's an entire thread at the top of the graphics card forums about it mate
Yeah i did see that but it's a very old thread so i'm not sure how accurate the information is.
Also some use screws which flake off the paint when undone eg Zotac.Most cards i've had have come with the annoying little sticker on one of the screws that voids the warranty if damaged/removed.
Zotac is a no no. Theyre a bit crap with the warranty too, has to be registered straight away to get the 5 years out of them.
Suppose it's not that big an issue if you're the original buyer but if it's second hand, there's no warranty.
Its quite good that you get 5 years.. Cannot complain really compared to 2 years on some brands.
Also some use screws which flake off the paint when undone eg Zotac.