The MSI GTX 660 Twin Frozr OC Edition comes with MSI’s famous Twin Frozr III heatsink. With the PCB coming out to 8.8-inches, the dual-slot heatsink atop the MSI GTX 660 looks rather impressive. Although looking at the empty space on the PCB, I’m surprised MSI didn’t shave another inch off the board; perhaps better cooling was top priority.
The heatsink is massive, with the aluminum fins block covering the entire surface area of the PCB. However, the only thing in direct contact is the GPU, with three heatpipes extending outwards. The two 75mm fans provide more than enough airflow into the heatsink, with a metal cover on top.
All of this is good enough to allow MSI to over clock their GTX 660 Twin Frozr with 1033MHz (1098MHz boosted) on the core clock, while memory speeds remain the same as reference, with 6008MHz. The core clock has a decent 5.4% speed boost; not as much as I expected.
The build quality of the MSI GTX 660 Twin Frozr is as solid as the Zotac GTX 660 AMP! Edition, only bigger. This may help the former keep the card cooler than the competition.