Update: Superglued (don't have glue gun) two fans as additional intake. The flow now is pretty decent (best I can do for now).
Yet the temps didn't improve much; AvP benchmark gets it to a max of 82C.
The 5770 V1 is the one getting hot I think. Unfortunately it's too long to swap positions with my V2 to see if that would help.
When I used MSI afterburner to regular the fans manually using the software, I got it to turn up the fan speed a LOT when it got past 75C and it was able to maintain a lower max temp of I think 78C for example. It's too loud for me to leave it at that speed. Therefore my conclusion is that the stock heatsink/cooler is really ineffective
I'll have to look at aftermarket coolers since I love these GPU's so much but they will be hard to mod, especially cuz they're different shapes so will need 2 different aftermarket coolers.
Edit: 2500th post