Ok guys thanks for all the advice
i'm gonna clean out my PC very soon as its a bit too dusty
im not gonna try reapplying the heatsink as it seems too much work for my old system, if my graphics card suddenly explodes (hopefully without taking my computer with it) then i will just by a cheap replacement. Also my LE card isnt too bad
after all, its still the same 6800 core, just a bit less powerful.