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You are wasting time and risk the warranty of your GPU's for 3/4c drop max, maybe nothing...
Manufacturers do a proper job nowadays, and even better job on high end cards.
Op, what three video cards do you have and what do these cards do, game, mine, fold? The other thing I would be interested in knowing is have you had these cards since new or are they second hand.
I have found it necessary to romance thermal paste on some of my gpu especially older cards that I picked up second hand. This was more due to the age of the paste and it drying out mire than anything else.
So as far as replacing the paste, if the card runs fine under normal conditions and is not over hearing it is probably not worth the hassle especially if your card employs thermal pads that have to be messed with as well.
If on the other hand your card is overheating normally or if you compare the card to others with the same exact card and your temps are unusually high than it may be a candidate for a thermal paste replacement.
Lastly, if these cards are mining or folding 24/7 than it may be worth replacing the thermal paste even if it only gets you 3-5 degrees. The cards will benefit by any heat reduction when used under these circumstances.
Agree with Loch.
Not true my brutha. Most of my card's factory TIM was horrible and temps to match. Once I swapped out the TIM, temps improved by quite alot. I got into the habit of redoing the TIM on all my cards because of that. I have yet to get a card that the TIM used actually works as it should and is not globbed on by some 5 year old in a sweat shop.
I wound up doing this unintentionally the other night, when I was picking apart my pny 1050 ti for cleaning. It was already past the point of no return (with this little red NO circle sticker on the final philips screw), and then i realized I had disturbed the TIM when the two glops fell apart between the heatsink and die. It was particularly sloppy in its stock application, so I cleaned it up and replaced it with Noctua's compound, though for the card I doubt there will be much motivation for its users to mess with its stock config.