I recently picked up a Ryzen 5 7500X3D and a 7200MHz CL34 DDR5 RAM kit, but I'm wondering what RAM speed is optimal for this CPU. The official specs state 5200MHz, but I often see 6000MHz mentioned as the sweet spot for performance. For daily stable use, should I enable EXPO or stick to a lower speed, perhaps under 5000MHz?
3 Answers
For the X3D CPUs like yours, even though higher speeds help a bit, they don't matter as much. You could just enable EXPO at 7200MHz CL34 and call it a day. But if you really want to tweak for a bit more performance, you could try running it at 6200MHz CL28 instead. Just keep in mind that the 3D V-cache in these CPUs tends to mask any memory latency.
When it comes to Zen 4/5, the fclk:uclk:mclk ratio is key. Ideally, you want a 1:1:1 ratio, which means running at 6000MHz for the best balance. If you enable EXPO, you can set it to 6000 CL28-30 for tighter timings. If you'd rather not fiddle around, enabling EXPO and running at 7200MHz is fine too. The difference in gaming between 5200 and 7200 on a 7500X3D is minimal—about 2-3%—so it might not be worth over-analyzing!
I recommend enabling EXPO/XMP and then dialing the clock speed down to 5600MHz first. After that, you should test for stability using Memtest86. If it checks out, try bumping it up to 6000MHz and test again. That way you'll find the sweet spot without risking instability!
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