how it'd compare with a 92mm Panaflo mounted on it.
This was a concern I had as well, so I did try a PCPower&Cooling SIlencer 92mm, which is about the same noise level as the Panaflo and rated for 28 CFM. There was no appreciable difference.
Had both fans running, swap back and forth every 3 minutes and the HS temp stayed the same. I could feel the airflow from the fan coming all around the HS -- because of all the slots in the fins, the airflow does reach all over the place.
I think the softness of the clip is a problem on the Z. It is bent too easily, you can tell from the feel (and the sound when you knock against it) that the Thermalright clip is much springy / stiff. Probably if you use the Z. clip just a few times, it's fine, but I probably used it a hundred times. The ones I have probably got worn during my preps. I did spend months (off/on) working out this test procedure & in that time, did lots of HS experiments, which included a lot of mounting/unmounting.
One thing I noticed that if gentle even pressure is applied with the palm of the hand on my Z6000 set up on the CPU, the temp drops by a few degrees instantly. This didn't happen with any of the other HS, which tends to validate my suspcisions about the clip. If you go back and read my article about the test methodology, you'll see my POV is that mounting system is a hugely important part of the HS. An improved clip will probably make the 6000cu more effective, but it will not put it in the same class as the others despite its weight. Some conjectures:
1) The slot in the middle for the clip hurts performance
2) The fins are actually too long -- heat transfer becomes less efficient as you lengthen the fin. If it had shorter fins and more of them at the same weight, it would probably work better.
3) they should go a bit higher in mass, larger in fin #, lower & wider in fin size and use the 4 mobo holes for mounting. Then they would have something that might take on the Thermalrights.
I should have put this info in; the thing is so long though -- almost 8000 words already! I will add it later... ADDED -- to last page
BTW, in case it wasn't stated strongly enough in the review, none of these are recommended for use with the Panaflo at 5V (with any CPU at ~65w or higher) if you want a decent margin for error. The AX7 is *probably* safe if you have very good ventilation and/or don't push the system hard for long periods.
LeoV, I will check out BURNK7 & 6.