You will need:
- A decent precision screwdriver
- A reference ATI 5770
- A *THIN* layer of good quality thermal paste (MX-3 would be best)
- A pack of 8 VERY THIN low profile ramsinks, These Akasa ones will be the right size.
- TIM cleaner
I didnt take pictures of removing the cooler or applying the thermal paste, as this is easy to do.
The first step is to remove the ATI 5770 stock cooler and clean off the excessively thick layer of stock thermal crap :p
Secondly, you need to unscrew the GPU cooling block, and modify it with your 8 thin ramsinks exactly as shown in the pictures below (The ramsinks go on the top side furthest away from the fan):
The first 6 ramsinks:
And the last two fit on the outermost edge:
The ramsinks need to go on like this as further towards the fan side of the GPU block, there is a ridge along the bottom of the block so they wont fit any further down.
Finally, you need your good quality thermal paste like MX-3, and apply a very thin layer to the GPU and reapply the heatsink. I actually used leftover Asus thermal paste from my CPU cooler which I think looks like MX2, but MX3 will be a lot better.
Before the mod:
P.S. My idle / load temps were reduced by 4 / 9 degrees, but using MX-3 should get you better results.