Stock cooler for the 550 is not good enough for 4 cores. Youll have to get something aftermarket. This one of the few times fire not good.
I have a Zalman 9500. Works well, got it $15 off with a combo deal (pretty much sealed the deal), usually they are a bit more pricy but seem to work pretty well. Depends on how much you want to spend. This is my first build so the only product Im familiar with.
Just as an example, my 550 (no stable unlock...yet) is @3.8ghz, Northbridge is at 2.6ghz Im running at I think 1.46 volts (not at home so sorry I dont have exact figure but thats about right) Idle 30C load 41C. Definately well under limits so it gets the job done. Silent compared to my 5770s when they get over 60%
Anyone else have any feedback on a proper cooler?
On a side note I would reccomend leaving @ stock until you get a better cooling solution. Not only interms of heat but if theres any instability youll start writing corrupt files and have to reinstall windows and all your drivers which is easy but a huge inconveinence. Happened to me in the first few weeks I had mine. Passed ATI test, ran everything good, then KAPOW Windows turned on me, ran with constant errors and had to cleanify.
Ya, I only let it get to 55, then I stopped the test. I am not going to run it with all cores unlocked by any means until I have the heatsink to let it go through 13+ hours in prime. As for standard overclocking the stock cooler is fine for normal voltage, I get 49-50 C in prime (idle is 35-37 atm). But, I am waiting to really work on overclocking till I get the new heatsink. So it is sitting at stock and will be for a bit.