As opposed to the second generation of Gigabyte’s passive coolers we described in our Gigabyte GV-NX76T256D-RH review, every component of the Silent Pipe 3 system is located on one side of the PCB.
The system is based around a solid aluminum heatsink with thick diagonal ribs that also serves as a cooler foundation fastened to the PCB with four spring-loaded screws and an X-shaped plastic plate. This foundation carries a copper plate that has contact with the GPU die and directs the heat flow to the two heat pipes.
One, S-shaped, pipe is longer and is meant to distribute heat in the main heatsink more uniformly, besides transferring it to the second, auxiliary, heatsink. The other pipe is shorter and transfers heat to the second heatsink. The first pipe has a soft pad that prevents the cooler from misalignment. A yellow thermoplastic material is used as a thermal interface. Its efficiency is lower than that of the traditional thermal grease, but it’s not a problem considering the modest thermal characteristics of the G84 chip. The Silent Pipe 3 cooler does not cool the memory chips. The QE chips generate little heat even at frequencies of about 1000 (2000) MHz, probably due to reduced voltage.
The second heatsink consists of thin aluminum plates and a copper base. Like in the GV-NX76T256D-RH cooler, the plates go out of the cooler casing through the slits in the mounting plate to improve overall cooling efficiency. With this design the cooler occupies two slots, but this is an acceptable tradeoff for the total noiselessness. Note that the main heatsink goes out of the PCB dimensions a little. You should take this into account when you are choosing the system case if you want to make the GV-NX86S256H the heart of your multimedia system.