The highest clock speed available for your i7-4790 is 4.2 GHz, not the K variant.
The highest clock speed available for your i7-4790 is 4.2 GHz, not the K variant.
I understand the K version is unlocked, but I'm curious if a modest boost around 4.3 to 4.4 GHz could help with certain games. It seems your CPU might be limiting performance. In COD Cold War map, you're currently hitting over 60 FPS on high settings and around 75-90 on average, but it drops to about 65 at medium 1080p. I'm okay as long as it stays above 65, though it can fall to the 50s if things get tough. With your 32GB DDR3 RAM, 1600MHz Intel i7, and a 250GB SSD, you're well-equipped for demanding titles and large files. Your monitor, an EVGA Supernova 750P2, is also performing solidly at 75Hz. Just hoping for a slight improvement.
Increase the BCLK value if possible, provided you don’t use NVMe SSDs.
The 100Mhz won't significantly impact performance in practice. The differences between outcomes will be minimal unless you lower the resolution in games and even then it'll be small. Going beyond BCLK or optimizing RAM timing won't change things much in my view, since most of the workload is on your GPU at the settings you'd normally use with a 1070. Games that are especially slow on HDDs may improve on SSDs, but only if the issue is really related to storage speed, not memory bandwidth or CPU thread usage.