Now here is some interesting info. I ran the other TR heatsinks using the Venomous X mount and here are the results I saw with them and the Venomous X mount:
Original TRUE with Venomous X mount, 2 Denki's in push-pull config:
Core 1 max temp - 58.5 C run 1, 59 C run 2
Core 2 max temp - 58.25 C run 1, 59.5 C run 2
Core 3 max temp - 54.5 C run 1, 54 C run 2
Core 4 max temp - 54.25 C run 1, 54 C run 2
TRUE Rev. C with Venomous X mount, 2 Denki's in push-pull config:
Core 1 max temp - 59 C run 1, 58.5 C run 2
Core 2 max temp - 59 C run 1, 58.75 C run 2
Core 3 max temp - 54.5 C run 1, 54 C run 2
Core 4 max temp - 54 C run 1, 54 C run 2
Copper TRUE with Venomous X mount, 2 Denki's in push-pull config:
Core 1 max temp - 58.75 C run 1, 58.5 C run 2
Core 2 max temp - 59 C run 1, 58.5 C run 2
Core 3 max temp - 54 C run 1, 54.25 C run 2
Core 4 max temp - 54 C run 1, 54 C run 2
Now compare those temps with the Venomous X run in the same configuration above (repeated here):
Venomous X with 2 San Ace fans in push-pull:
CPU1 max temp - 59 C
CPU2 max temp - 59 C
CPU3 max temp - 56.25 C
CPU4 max temp - 56 C
Looks to me that for all intents and purposes, it's a tie between the 4 heatsinks.
Note: This was using the Venomous X mount with the center screw all the way in for maximum clamping pressure for all runs. It's looking to me like the biggest difference between all the heatsinks is the mounting system for the Venomous X giving better clamping pressure, which is giving better heat transmission. I am presently running the TR heatsinks using the Rev. C TRUE mount and see what kinds of temps I see with all 4 heatsinks. I have a ways to go, but it's looking like the Rev. C mount gives worse temps, as the first heatsink I'm checking is the Venomous X and I am seeing higher temps across all 4 cores.
EDIT: Runs below are with the Rev. C TRUE mount that has been modded with using a Swiftech backplate instead of the one that came with the mount. That is because the Swiftech backplate gives a tighter mount to the mobo than the TR backplates, which yields more clamping pressure between the heatsink and processor. I tried with both backplates and the Swiftech one gives 1-3 C better temps.
Venomous X with 2 San Ace fans in push-pull:
Core 1 max temp - 62 C run 1, 62 C run 2
Core 2 max temp - 62 C run 1, 61.75 C run 2
Core 3 max temp - 56.5 C run 1, 55.75 C run 2
Core 4 max temp - 56 C run 1, 56 C run 2
TRUE Rev. C with 2 San Ace fans in push-pull:
Core 1 max temp - 60.25 C run 1, 61 C run 2
Core 2 max temp - 60.75 C run 1, 61.75 C run 2
Core 3 max temp - 54 C run 1, 54.25 C run 2
Core 4 max temp - 54 C run 1, 54 C run 2
Original TRUE with 2 San Ace fans in push-pull:
Core 1 max temp - 59 C run 1, 60 C run 2
Core 2 max temp - 59 C run 1, 60 C run 2
Core 3 max temp - 55.25 C run 1, 55 C run 2
Core 4 max temp - 54 C run 1, 55 C run 2
Copper TRUE with 2 San Ace fans in push-pull:
Core 1 max temp - 59.25 C run 1, 59.75 C run 2
Core 2 max temp - 59.75 C run 1, 59.5 C run 2
Core 3 max temp - 55 C run 1, 54 C run 2
Core 4 max temp - 55 C run 1, 54 C run 2