Good air cooling and 4 DIMM's

[Nedjo]

What's the best solution for air cooling the Phenom, and still be able to use all four of dimm slots?

[VSpecII]

Whats stopping you from using all four, exactly? (What heatsink are you having trouble with)

[Jakalwarrior]

Alost of the sinks now days start off narrow down at the bottom, then the heat pipes run up and into a fatter part. Plenty of height so anything standing off the motherboard isnt obstructed.
On my XP90 (not the best anymore) some motherboards place the ram underneat it. It hangs completely over them but there is still enough room to take the ram in and out behind the heatsink.

[Nedjo]

Whats stopping you from using all four, exactly? (What heatsink are you having trouble with)
four 1066 Dominators are stopping me! They're to high for Ninja rev.B

[Jakalwarrior]

four 1066 Dominators are stopping me!
Now that is a different story.

Where is your ram located at on your board? in relation to the socket?

Something designed like http://www.newegg.com/Product/Product.aspx?Item=N82E16835200015 might work

[64dragon]

something like this would work too
http://www.petrastechshop.com/thsihecpucos.html