Intel has just released the first Pentium-branded processor to have 4GHz clocks out of the box, with the new Pentium Gold G5620. The new CPU replaces the G5600, and is based on the 14nm 'Coffee Lake' CPU architecture.
The new Intel Pentium Gold G5620 is a 2C/4T processor at 4GHz (without Turbo Boost), 256KB of L2 cache per core, and 4MB of shared L3 cache. There's also integrated graphics in the form of Intel UHD Graphics 630 which rolls out with 24 execution units. There's dual-channel DDR4 support, which will house up to 64GB off DDR4-2400, although I don't know who would pair a 2C/4T processor with 64GB of RAM.
We're looking at a TDP of just 65W and no pricing just yet but we should expect it to be around $100 or so, with availability next month.