The RVZ01 has pretty good cooling for the GPU. Make sure you feed it with two 120mm fans and keep the case standing.
The case is standing, but I only have one case fan for the GPU. Now that I think of it, that fan is controlled by the CPU temperature, so when benchmarking with heaven or valley, this fan is not spinning and is more of an obstruction than a help.
The GPU I have is the Gigabyte GeForce GTX 970 4GB G1 Gaming, which should be one of the best cooling cards out there.