Originally Posted by derfer
Maybe this has been covered before, but I was wondering why is this so effective? I mean these coolers are meant for CPUs that suck down a half or a third as much power as these GPUs, yet the temps on the GPUs are better with these coolers? The only explanation I can conceive of is GPUs are radically less leaky than CPUs.
CPUs sit in a socket. GPUs are soldered down on the card. Cards typically have inner copper plane layers for ground and power. It can and does act like a heat sink to some degree. A GPU card typically has better exposure to air flow than a motherboard.
The larger GPU die has more surface area, and maybe less power dissipated per square mm.This could lower delta T (temperature difference) between the die and the outside world.
Not all of the GPUs card power is used in the GPU chip. Some is lost to VRM (in)efficency, and some is used in the VRAMS. I coud hazard a guess, but it really would be a guess. It would be nice to see actual specs on the GPUs.Edited by WarDad - 6/22/12 at 10:18am