5-6 GHz is a party trick of low core count CPUs (e.g. 4 or 8 cores) that use 250+ W of power to get less than twice the performance they can get at 25 W.
There is a sixty four core OoO RISC-V chip (SG2042) being demoed on a dev board in the last weeks. It runs at 2.0 GHz and has quite a bit of aggregate performance, at lower energy usage than an 8 core i9 running at 6 GHz.
There is a sixty four core OoO RISC-V chip (SG2042) being demoed on a dev board in the last weeks. It runs at 2.0 GHz and has quite a bit of aggregate performance, at lower energy usage than an 8 core i9 running at 6 GHz.