Finally we come to manual overclocking. We have already seen how Ampere is already pretty limited in this regard, and unfortunately this is no different for the RTX 3090. In fact, I could only add an extra 10MHz to the GPU core, as anything more resulted in crashes during 3DMark Time Spy. Thankfully, the GDDR6X was a bit more amenable to an overclock, and I could add 950MHz to the memory, bringing speeds up to 21.4Gbps.
Still, real-world gains from this overclock weren't huge, as we saw an extra 5% at most when testing Gears 5, Ghost Recon: Breakpoint, and Total War Saga: Troy.