intel extreme tuning utility says 4gb gpu

You enter the BIOS/UEFI by hitting 'delete' or F2 (on most boards) during boot up. PSU: I would leave about 200-300W aside for a nice overclock on an 9900K/KF.Your cooling is your ultimate limitation on your overclock when you are at above-ambient temperatures, so don't cheap out on a cooler.

They are easy to install, safe, and perform well. Cooler: High-end air coolers are recommended, but most people get all-in-one water-cooling coolers since they offer the best of both worlds.Four sticks are harder to overclock than two, and if you get a four stick kit, you can't expect more than 3200MHz with ease (especially if it's a 64GB kit).You can find your QVL in the support section of your motherboard vendor's website or inside the manual (if differs by brand). You don't need RAM that fast, but if you can afford it, you shouldn't have a problem getting it to run at full speed. While we still recommend buying a kit off your motherboard's Qualified Vendors List (QVL), up to 3600MHz is a good target for easy stability. DRAM: Intel and motherboard vendors have greatly improved DDR4 compatibility and speed potential, at least compared to Skylake.Even at stock settings, power supply guidelines are much higher. Motherboard: Intel changed power supply guidelines when switching between the Z370 and Z390 chipsets, and even though both chipsets will support overclocking, you will need a Z370 motherboard or Z390 motherboard with a very high-end VRM to get out every little bit of performance.Where do I start? 9900K Overclocking Guide Systems

Intel extreme tuning utility says 4gb gpu