Squick, in essence your trying to replicate stock cooling as this is what the vender deemed as nessassary. When possable try to retain all stock cooling plates as a miniumum. The cards had a fan blowing down onto the pcb so your going to need to get some air moving across the pcb to replicate stock. If you need to remove the stock fan then you will need to replace that airflow to the pcb some other way. Many are able to retain stock fans/shroud, this is desirable.... and cheapest. Dwood has a bracket which allows for a fan if your unable to retain the fan that came with the gpu. From what i understand Dwood is also in the process of fabricating something for users to retain the shroud and this may make all this pcb/vrm cooling issues a thing of the past WOOT.
I ran my 560ti for a long while with no airflow to the pcb, only kept the unisink AND i had the shroud attached, no issues for me, card still works fine. My case a good air flow and im sure that helped. I was willing to accept the risks of running my card this way.... are you
Best advice is to mimic stock cooling, this at the very least will keep the card safe..er, mods are mods so also keep that in mind._IGP9528
, on Flickr
as you can see here, no fan at all. Anything do over and above stock will only server you better.