just nice to have lot temps i suppose

diagram is posted up ^^^ - pretty big so i linked it rather than display.
wanna keep things pretty quite - so with the amount of fans i have dont wanna add any more.
i mean if the water temps are high and i dont play to change the fans - if i brought a better waterblock like the cascade would it improve temps? i mean if the DD isnt going to its full potential cos of the water temp...then surely the cascade wont make (much) of a diff?
the GPU block is the old one - not the maze4 style one. i linked everything up and the waterflow was still pretty good - wasnt drizzling out or anything