I tried overclocking an RTX 4060 (MSI Mech) and I've gotten a stable overclock of +250 MHz on the core and +1800 MHz on the memory. I am using an outdated motherboard for my test rig with a PCIe 2.0 slot, so there's definitely going to be some performance loss. The baseline graphics score I achieved on TimeSpy was around 10,100 or something like that, so the improvement is most likely limited by the PCIe bandwidth.