Round one of testing consisted of a single Ultra Kaze pushing through the 'sink, with the cpu at its stock speed of 2.66Ghz. Idle temps across the cores:
36 33 34 34
Load temps:
44 38 41 39
Round two of testing consisted of two Ultra Kazes, the original pushing, and the secondary pulling through the 'sink. Again, stock speed of 2.66ghz. It looks like the second fan helps out by about 1-2 degrees.
Idle temps:
36 33 34 34
Load temps:
42 37 40 39
Round three of testing consisted of two Ultra Kazes, both pushing air into the middle of the 'sink. As before, stock speed of 2.66ghz. I stopped the test prematurely because, as you can see by the load temps, the push-push configuration is counter-productive even to a single fan pushing through.
Idle temps:
36 33 34 34
Load temps:
45 40 43 41
The last rounds of testing were done at 3.6ghz with 1.328 vcore- which is [I think] a ton more than what I need to be stable. I'll be backing that down and re-testing for stability as I get more time. The idle temps for both push and push-pull configurations were the same as stock speeds, so I can pretty well say that my sensors are stuck at those points.
3.6ghz push, Idle temps:
36 33 34 34
Load temps:
56 52 54 52
3.6ghz Push-pull, Idle temps:
36 33 34 34
Load temps:
55 51 52 50
So, it looks like a push-pull configuration is still good for about 1-2 degrees with my particular choice of fans.