tftcentral.co.uk has a calibration profile as I recall. Really you should do a hardware/software calibration with tools, but it isn't a pro grade monitor, so no real need for super accurate color reproduction. You paid for speed.
165Hz is actually overclocking the panel. They recommend against it as it reintroduces ghosting and latency. Also not guaranteed, it is "Up to" 165hz, a few people have posted their panels can't even do it. Better to run it at native 144hz.
But if you want to give it a go, simply change the setting in the monitor menu, then set your desktop resolution to that under advanced display adapter properties in Windows.