RAM speed doesn't matter
as much.
The performance of memory is always relevant, even on systems with large cache. After all, it's only ~100 MB of cache.
You have a 3440x1440 144 Hz monitor with an upper mid range GPU, meaning you likely won't notice much better average FPS with a faster RAM tune since you're GPU limited anyway and 144 FPS is not challenging even for non X3D chips.
For someone looking to increase their min FPS and also reach more ambitious FPS targets, such as 240, 360 or even higher Hz, I can assure you that RAM tune will make a significant difference, even with X3D. Not to mention general productivity apps which don't benefit from the cache that much.
While I agree that chasing MT is generally pointless on
AMD, reducing the system latency from optimizing memory will mean your X3D chip is actually performing to it's peak, rather than spending time waiting for 4800 MHz DDR5, with a latency that I would expect would be in the upper 80ns range or perhaps higher. With my tune I have ~55ns RAM as measured by AIDA.
This is a simplistic first word latency calculator, it doesn't take into account the other subtimings which are more important on DDR5, but it still shows the relative difference between JEDEC speeds and a good tune ~40% lower latency.
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