Why does it matter that Ramsinks can be smaller but not larger than the ramchip?

[BoomAM]

Hi.
Why is it that manufacturers reccommend that a Ramsink be smaller or equal size to a ramchip, but not bigger. Whats the difference? If anything, it being bigger would aid cooling potential, as it gives larger surface area to cool. And if it does make a difference, then why do we see open core CPUs (like the AXP), that in a similar way, have a heatsink thats far bigger? And dont argue that the CPU needs more cooling cos its the same situation, the core is raised up slightly (like a ramchip), and the core has a cooler that covers it, and the surrounding area.

Anyway.....answers?

 

[coot]

i think if you look real close you see parts that stick up and keep the sinks from from seating the way thet are supposed to , one side of my ti4600 was ok the other i had to cut them i didn't see em at first but they stuck up enough to cause interference

 

[BoomAM]

I have some Coolermaster CRC-U01 Heatsinks on my 9700pros memory. They are bigger than the chips longways, but not in width. So i stuck two together so they took up the whole chip. I noticed the other day that the packet says that they should be used if they`re bigger than the chips.
I have nothing preventing them from being seated propely, so they`re fine.
But it cant be a simple as that can it? Its just incase something would be preventing the sink from having decent contact with the chip?

 

[coot]

if n you don't have interferance prob i don't see why it wouldn't iwas scared something would short out or something i 'd hate to lose a vid brd over a 3.00 heatsink i'd have to ware a pair of tenny shoes kickin' my self in the a$$ but if it ain't hittin' seems bigger is better

 

[BoomAM]

Thats what i was thinking.
Lets hope it is.