Infact, a cooler like the Accelero Twin Turbo II will cool the RAM much better VS the stock cooler. First of all I use heatsinks on all appart from 2 chips. Secondly the two Twin Turbo fans blow air all over the PCB to cool the RAM chips even better.
Several years ago I owned a 8800GTX. This card had temp monitors for many components of the board. vrm's with the stock cooler exceeded 90c and all temps were very high across the board. Then I changed to the Thermalright HR03 Plus. This cooler is similar to many of the Arctic Accelero coolers... The temps dropped tremendously across the the card. Not just the GPU temp.
Also, the GTX 670's reference cooler have no cooling of the RAM chips. Only core and blowing hot air through the vrm heatsink.
Even the ram chips on the backside of my card are much cooler now vs with stock cooling. This is because the card in itself (pcb) is much better cooled and because I have heatsinks on the chips.
With the stock cooler I burnt my finger when holding on the RAM chips under load. With this cooler they are just a little bit warm to the touch.
Even the vrm heatsinks are only warm to the touch, and not superhot. As I've said, the two fans are blowing through the Twin Turbo heatsink and cooling down the card. Also, I have a sidecase fan blowing fresh air directly towards the card and feeding the Twin Turbo fans with fresh air. But even without this, the card is nice and cool.
So people, stop assuming if you don't know.
And those stock coolers like GTX 580 and 680's use, are the same principle as the coolers used for 8800GTX/Ultra. They have heatplates with thermal pads covering all RAM chips, VRM's and all that stuff. This is in no way a good solution. They trap more heat than actually cooling the chips. My best proof was with the 8800GTX, since it had so many sensors, I could monitor all temps.
It is much better to have a naked PCB with sinks on everything and fans blowing directly down on the PCB to cool everything even better.
Had I changed the stock cooler of my now dead Gigabyte GTX 570 (reference) card, to a good Arctic Accelero Cooler, I'm sure the card would have still been up and kicking. The card's pvm simply overheated and burnt with the stock cooler (Same cooler as the reference GTX 580 and similar to many other stock coolers, with that heatplate and thermalpads covering the whole pcb).
And my old 8800GTX with the HR03 Plus I sold to a boy several years ago. He is still gaming on it very often. That card was bought in the beginning of 2007 if I remember correctly. I'm sure that card would have been dead a long time ago hadn't I changed cooler. I'm sure of it.