Ryzen X3D CPUs are known to be a force in gaming, even without fast RAM. However, this doesn’t mean that optimized system memory settings can’t be used to achieve even better performance. After all, the cache is just that – a cache – and sooner or later the data has to be written to or read from the RAM. Not every gamer has the time, inclination or tinkering skills to manually optimize DDR5 to the limit. As so often in life, however, the 80/20 principle also applies here – 80% of the yield can be achieved with 20% of the effort. This is precisely why XMP and EXPO exist, which take the first steps for the user and “guarantee” a performance boost with a few presets.
That’s exactly what I want to show you today. How much performance can you really gain by optimizing beyond EXPO? Is it worth making the jump to 2:1 mode? How do large dual-rank kits react at these limits? Is the effort of manual tuning worth it in the end? And you can also find out why the X670E Gene almost drove me crazy.
I’ll also try to give you a few tips and general recommendations for RAM overclocking on the AM5 platform. After all, even EXPO/XMP/DOCP and whatever else it may be called is ultimately still OC operation. At this point, I would also like to refer once again to our basic article on RAM overclocking. Neither the principles nor the demands on stability have changed since then, and anyone processing critical data on their computer should also stress-test their EXPO profile!
Official specifications for Ryzen 9000 X3D
But let’s start with the official AMD specifications. It clearly states for all Ryzen 9000 X3D CPUs: DDR5-5600 is supported with 2 RAM modules, each with 1 or 2 ranks. DDR5-3600 is supported with 4 modules, each with 1 rank (1R) or 2 ranks (2R). Beyond that and in between there is nothing.
This means that if you currently buy a 32 GB, 2x 16 GB kit, DDR5-5600 is supported and should even run automatically without any intervention in the BIOS. This also applies to a 96 GB, 2x 48 GB kit, as these are 2 modules, each with 2 ranks, each with 8 24 Gbit ICs.
Conversely, with 64 GB consisting of 4x 16 GB modules, only DDR5-3600 is supported. This is because as soon as 4 modules and therefore both slots of each channel are active on a 4-slot mainboard, the supported clock rate automatically drops to 3600 Mbps. The reasons for this may be known to some – signal integrity and reflections in daisy-chain topologies etc. – but this is all secondary.
The important thing is to always stick with 2 modules first, 1 per channel, and choose the largest possible size. Only when 2 dual-rank modules do not provide enough capacity for the tpta; capacity you want is it sensible to move to 4 RAM modules. All this, of course, in the context of maximum clock speed and performance. You should also bear in mind that the specifications refer to RAM ICs that are available at the time of the CPU launch, i.e. 16 Gbit and 24 Gbit chips. It remains to be seen how this all relates to 32 Gbit ICs, which have already been announced by some manufacturers.
- 1 - Intro and official specifications
- 2 - RAM kits and best practices
- 3 - Test system and RAM configurations
- 4 - Benchmark Results – Asus Crosshair X670E Gene
- 5 - Benchmark Results – ASRock X670E PG Lightning
- 6 - Benchmark Results – MSI PRO B850-P WiFi
- 7 - Benchmark Results – Asus PRIME B650M-R
- 8 - Lessons learned and recommendations
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