There are 3 heat pipes on the heatsink – 2 x 8mm major heat pipes to distribute the majority of the heat from the GPU to the heatsink, and a 3rd 6mm heatpipe is used as a supplement to the design to reduce another 2-3 degrees Celsius. The way the EVGA GTX 970 ACX heat sink was designed is based on the GTX 970 wattage plus an additional 40% cooling headroom on top of it. Update: EVGA has since released a statement in respose to concerns raised about the effectiveness of the ACX2 cooling solution: ![]() ![]() However, as you can see from the thermal goo outline, only two actually touch the GPU, which will significantly reduce the effectiveness of the third one. The copper, U-shaped heat pipes are nickel plated and are designed to make direct contact with the GPU. ![]() It could be reserved for RMA issues, or perhaps will be enabled in future revisions.ĪCX 2.0 is a new cooling solution from EVGA that comprises a triple heat pipe heatsink and a pair of 85mm fans. The rear of the PCB also includes what looks like a dual BIOS switch (shown above), but it has been blocked out on our sample and is inaccessible.
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