Benchmark Platform & Settings

We used Thermalright T-Rad² cooler to test the cooling performance of VRM-R1 and VRM-R2, compared with that of normal Mosfet heatsink.

Mosfet heatsink

PCB temperature measuring spot

Thermalright T-Rad2 runs with dual 9225 fans, while VRM-R1 and VRM-R2 run with SilverStone SFA8025MS fan, with fan speed of 1500RPM.

We found a few small tweaks on Sapphire Radeon HD 4890 and the VRM heat has reduced a little as well.

The ambient temperature was 24℃, and the case does not have a side panel fan.

Cooling Performance

According to our test, the VRM-R1 and VRM-R2 deliver much better cooling performance compared with normal Mosfet heatsink, especially when the machine is loaded.

When running with the fan, VRM-R1 and VRM-R2 can also cool down the GPU a bit – from 65℃ to 63℃.

Final Thoughts

Thermalright VRM-R1 and VRM-R2 are ideal VRM cooling solution for Radeon HD 4870 and HD 4890, though they provide comparatively limited applications.

VRM-R2 is suitable for most ordinary cases, while VRM-R1 is an ideal choice for the cases with side panel fan. With equal cooling performance, they’re both available at RMB190 (excluding fan) which is about US$29.

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