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GIGABYTE Z390 9th Gen OC Guide & VRM Thermal Test (Page 1)

GIGABYTE Z390 9th Gen OC Guide & VRM Thermal Test

An extensive overclocking guide and VRM thermal test for the GIGABYTE Z390 motherboards.

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

Overclocking GIGABYTE Z390

Today we will be describing in detail how to easily overclock the new 9th generation hexa and octa-core Intel CPUs on GIGABYTE Z390 motherboards. GIGABYTE specifically redesigned their motherboard line up to support the new CPUs, as they pull significantly more power than their predecessors do, all up and down their Aorus Gaming lineup.

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Overclocking the motherboard through GIGABYTE's UEFI is pretty easy, but we will make it even easier for you by telling you exactly what to change to get the results you want. We think most everyone should be able to hit 5GHz, as long as they have sufficient cooling.

The Flow Chart

Overclocking is simple; you set a multiplier and a voltage, then you run a test, if that test fails you either add more voltage, reduce frequency, or increase cooling. There are some other tricks this round, such as adjusting up Tjmax (Intel added this for Z390 specifically to increase thermal throttle point) and increasing power limits. The hardest part of overclocking for most people might just be finding a good starting point.

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Our CPU is capable of 5GHz AVX and 5.2GHz non-AVX (can call it SSE) under very stressful conditions, and our CPU can even run benchmarks such as the Blender Benchmark and programs like Handbrake, both of which use AVX, at 5.2GHz. However, Prime95 won't run at 5.2GHz. You might want to use that as some sort of guide point for what you might expect. Now, we will use the 9900K as our example in this guide, and by default all core Turbo of the 9900K is 4.7GHz, meaning all cores can operate at 4.7GHz all the time. GIGABYTE's Z390 motherboards fully support this, not all do, and so you should aim for 5GHz stable if you have watercooling.

You can start VCore at 1.25v at 5GHz, but you will probably find you need bumps towards 1.3v to run Prime95 with AVX. We don't really recommend taking VCCSA or VCCIO over 1.3v, we like 1.25v each as maximum, but you can go higher. We also found that VCore over 1.3v was a bit tough to cool and might require a Tjmax set to like 110C to avoid throttling. Intel obviously added in this feature because they knew the CPUs run on the hot side, so they are letting people move the throttle point up. We are not saying it's 100% safe, just that you can.

The Video

Many users prefer videos, so we made a video for those people describing how to overclock with this motherboard.

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