Got the thermal paste this afternoon just finished reassembling everything and the temps seem to have improved a bit.
Atm just idling on control fan utiliy both the cpu and rsx are sitting at 61c.
In game the rsx still tends to go bit higher than the cpu but I'm starting to think it's normal as the rsx is meant to process all the graphics while the cpu just takes care of all the computations. Usually that's how it is on pcs anyways games tend to be heavier on the graphics chip.
In order to improve the temps any further i would have to remove the ihs boards and apply new thermal paste on the chips themselves but I'm not going to do it because it's very risky , i dont have the tools for it and this requires someone with good experience doing such which I dont. So for now I'm good with this.
I also had a bit of a hard time removing the motherboard as artic silver 5 is very sticky so i recommend take your time and use a flat head screw driver on the sides where those gold bits are and try to push it up all around the motherboard to try and unglue the chips. Do it with a lot of care.
I also had to remove the heatsink screws on the side and try to wiggle it a bit so the paste would unglue off the chips.
Take your time doing this and have patience.
Try not to bend the mobo too much by applying too much pressure on the sides so you wont break anything.
For how to apply thermal paste on a ps3 i recommend this guy as he seems to know what hes doing as he repairs a lot of ps3s.
As long as the temps dont differ too much from another its fine.
As for me i think my temps are good.
Idle in control fan utility cpu61c rsx61c payload mode.
Remember, if you want to improve the temps more ihs removal is required.
I've also removed sman and will just be using fan control utility to check temps i dont think the ps3 will overheat now specially after a fresh thermal paste change. Will use payload mode to keep it safe so both chips wont reach dangerous levels else if damage is caused youll see what happens on the video.
Take care and live long the ps3.