I've never had any heat problems with my A3640 in the A3000, although mine may be rev 3.2.
Yes, the existing CPU sink is to tall to fit under the plate, I replaced mine with a low profile sink. No other mods to increase the venting, but no problems so far. Though I have to admit I havent used it for any CPU intensive work recently. It's been in the A3000 for a couple of years.
Absolutley no noticable increase of speed in everyday work... :crazy:
