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GIGABYTE Z390 9th Gen OC Guide & VRM Thermal Test (Page 2)

By Steven Bassiri from Nov 26, 2018 @ 10:00 CST

Disclaimer Overclocking your CPU technically voids your warranty. However, if you want to overclock and still be covered, Intel does provide an aftermarket overclocking warranty for about $50 located here: (PTPP). However, as of now, we don't see any 9000 series CPUs listed, we have contacted Intel for comment. Overclocking can also damage your CPU, especially if done incorrectly. This guide is about how to overclock, but neither TweakTown Pty. Ltd. nor GIGA-BYTE Technology Co., Ltd take responsibility for damages that could occur; you bare sole responsibility for any damages that may arise.

Have you Overclocked Before?

If you have overclocked before and understand hardware selection and the basics of overclocking, you should skip to the next page, but we will warn you the 9900K is a special beast. The first part of this guide is for those who want to know what to do before overclocking.

Where do I start?

GIGABYTE Z390 Overclocking Guide Systems


CPU: You will need a "K-SKU" CPU such as the 8086K or 9900K.

Motherboard: While you can buy a GIGABYTE Z370 motherboard, we highly suggest you buy a Z390 motherboard from GIGABYTE. While you are probably here because you bought a GIGABYTE Z390 motherboard, we just want to put this out there because of spec changes to the power supply design guide. Intel increased power supply requirements 70W under sustained load to 213W stock and over 100W peak at stock. After the PSU feeds the motherboard VRM, the VRM then changes that voltage from 12v to something like 1.25v for the CPU, and that is where Z370 motherboards generally fall short (except high-end). GIGABYTE has designed all of their Aorus Gaming Z390 motherboard to handle the increased requirements.

DRAM: If you go to GIGABYTE's website you will find a tab under "Support" for "Support List". Under that you will be able to download individual lists for each motherboard, such as the Memory Support List for the Z390 Aorus Master. We recommend a 3200MHz-3600MHz kit. Something around 3600MHz with tight (lower) timings is very good for many things.

Cooler: We strongly recommend the best watercooling you can buy if you are going to overclock Intel's new octa-core 9900K. We used a Corsair H150i Pro, but we felt it was at its limits at 5GHz with 1.275v. Custom water-cooling should do better, even the kits where you put the cooler together should be slightly better, but they will be much more expensive.

PSU: Intel has changed their power supply design guide as recently as June 2018. When buying a PSU look for PSUs that offer at least 29A on the 12v rail for the CPU, which is about 350W. That is the maximum peak power draw at stock for the 9900K, so take into account overclocking and the amount of power things like your GPU will use.

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