G.Skill 3800MHz 4x8GB SO-DIMM Overclocking
G.Skill showed off the kit in October, and it is slated to be released in December 2017. It has been validated on this motherboard, and while we don't know the price, we do know it is labeled F4-3800C18Q-32GRS. It's a 32GB kit with four 8GB sticks, and it's a beast for a SO-DIMM kit. The motherboard supports quad channel memory, but only because of the SO-DIMMs and their size. There is not much difference between SO-DIMMs and normal DIMMs in regards to performance.
If you just want to set and forget, just set XMP profile. I went ahead and set DDR4 frequency to 3733MHz manually and took the timings down to help decrease latency. The settings you see above are of my preferred profile, which is 3733MHz C16 instead of 3800MHz C18, and that's because of my CPU's internal memory controller (IMC). I set this because it is easier on my CPU's IMC, and most applications I use like latency more than frequency, although games should prefer higher bandwidth. There are some fast boot settings dug deep at the bottom of the memory sub-timings menu, you can mess with them, but they are disabled by default to improve memory support. The motherboard also has built-in memory testing.
Voltages are also important, and while default VCCIO and VCCSA are around 1.1v, the motherboard automatically increases these when setting XMP this high. These auto-rules were developed by ASRock's overclocker (Nick Shih) and engineers to ensure compatibility with this kit. I also went ahead and set DDR4 voltage on each channel to 1.5v. If you want to tweak your IMC a bit more, you can also increase internal system agent offset to 0.4v.
On the left, we have memory overclocked to XMP with the CPU at stock, while on the right we have both the CPU overclocking and memory at XMP. For reference, at stock in quad channel the memory scores around 63-69GB/s, so these are huge increases.
On the left, we have 3733MHz memory speed with tuned down latency. However, watch out for dropped channels when pushing beyond XMP, as you see on the right. The system booted up at 4000MHz with XMP timings, but our bandwidth has dropped significantly, lower than stock. CPU-Z is showing all the memory in quad channel, but that isn't correct. The system is running in dual channel mode, which is why we see slightly lower latency and significantly lower bandwidth. You can see this in the UEFI as it will show only two sticks while CPU-Z shows four. If you see this, it means your internal memory controller (IMC) needs more volts of lower temperatures.
Here we can see how overclocking, even just with XMP, results in HUGE memory gains in both bandwidth and latency.
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