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I have to change my heatsink and would like to make sure to avoid compatibility issue on arrival of item.

My Heatsink part# is AT0CX0040R0 DXON 0A 105K.

Would a AT0CX0040R0 DXON 0A 109D fit fine ? I can't find any 0A 105K

Like those two:
-http://www.ebay.com/itm/370825427473
-http://www.ebay.com/itm/111101383505

-Have you ever seen a heatsink going bad like this: (https://www.dropbox.com/s/uswkzt1qskmcudk/2013-06-16%2020.17.23.jpg) ? <--(not my actual heatsink)
The picture is showing the exact same problem im having (warm-cold copper at end just before radiator)

Thanks
Edited by marccoc - 6/19/13 at 4:50pm