Thermalright VRM1 and VRM2 Heatsinks
There are no VRM heatsinks for Radeon HD 4870 and HD 4890 included with Thermalright T-Rad2 GTX cooler and in my opinion, it is the best solution. Let me explain why. First, by adding any of the VRM heatsinks to T-Rad2 GTX accessories bundle, they would inevitably increase its already pretty high price and hence made this cooler less appealing to the end-user. Who knows, maybe you would like to use some other VRM heatsinks or prefer to cook breakfast on it and so you don’t need any extra heatsinks at all. Second, Thermalright designed VRM heatsinks of two different types: VRM1 and VRM2 that differ by the positioning of the side-mounted heatsink. In other words, it is up to the user to decide what particular VRM heatsink will suit best for his particular system case, which is quite logical.
So, VRM heatsinks are shipped in boxes of the same design as T-Rad2 GTX, only smaller:
The side sticker indicates the heatsink model. Besides, the boxes are of different height, so you won’t mix up the two heatsinks:
The heatsinks are bundled with two thermal pads, two wire clips for an 80 mm fan and an installation instructions sheet:
The heatsinks are both made in Taiwan and are selling at $28.95 for VRM1 and $29.95 for VRM2.
The only difference between the two is the direction in which the side-mounted heatsink is turned: when you install VRM1 onto the graphics card its side-mounted heatsink will be parallel to the mainboard, while by VRM2 it will be perpendicular to the mainboard:
The schematic layouts below show the detailed dimensions of the heatsinks:
Other than that the two heatsinks are identical and consist of a heat-spreader, heatsink and two copper nickel-plated heatpipes 6 mm in diameter connecting them together:
Each VRM heatsink weighs about 160 g total. The side-mounted heatsink consists of 25 aluminum plates, each perforates with 12 rectangular holes and 4 triangle ones.
Each plate is 0.45-0.5 mm thick and the gap between the plates is about 2mm.
You can use two wire clips included with the heatsink to mount an 80x80x25 mm fan, but our test results showed that you don’t really have to do it at all.
The heatpipes are soldered to the heatsink base, as you can tell from the traces of soldering on the heatpipes:
There are thermal pads included with the bundled accessories, but according to the instructions, you will only use one during cooler installation. It must be applied between the VRM and the heatsink base: