I was planning to run a few 3590's on 1,05A, so this is interesting.
Do you know how mutch 1 heatsink weighs ?
I myself have bought some old Xeon en Itanium server-heatsinks, witch fit a 3590 in a ideal cob holder.
Paid EUR 2,29 for the small ones (left, 450 gr Alu), 2,49 for the big middle one (650gr. Alu) up till 3,49 for the full copper one (700 gr)
Allready ruined a few heatsinks by bending them, so a fan will not fit anymore.
Was thinking of making a 350 mA - 700 mA cxb2530 setup with the bended heatsinks, but you give me new hope.