Is 64GB of DDR5-5600 CL46 better than 32GB of DDR5-6000 CL36?
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MellowJuniper42
I'm fairly new to AM5 and DDR5. My current system has a Ryzen 9 9950X3D, an RTX 5080, and 32GB (2x16GB) of G.SKILL DDR5-6000 CL36, but I'm already running short on memory. I regularly run two or three game servers, do 3D editing and 4K–8K rendering, and often use 18–24GB of RAM before even launching a game. My previous PC had 64GB of DDR4 and felt much more comfortable for these workloads.
DDR5 prices are high, so I'm considering a cheaper 64GB (2x32GB) DDR5-5600 CL46 kit. I understand that it has lower frequency and looser timings, but how noticeable would the difference be in gaming and general use compared with 6000 CL36? I've also heard that the extra cache on an X3D processor makes slower memory less important. Would you choose 64GB at 5600 CL46 now, or keep 32GB at 6000 CL36 until a faster 64GB kit becomes affordable?
Answers
DDR5-6000 is generally a good performance target on Ryzen, and tighter timings are preferable, but 5600 CL46 is mainly a concern when the workload is actually memory-sensitive. Gaming may lose a small amount of performance in some situations, while your server, editing, and rendering workloads are much more likely to benefit from having enough memory.
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The extra cache on the 9950X3D can reduce how often games need to access system RAM, so the gaming impact may be smaller than it would be on a non-X3D chip. However, the cache does not replace 64GB of system memory. When the processor misses the cache, it still has to use the slower RAM, and large applications and servers can quickly exceed the cache by a huge margin.
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If you buy the 64GB kit, check your motherboard’s memory support list and make sure the kit is validated for a 2x32GB configuration. Larger DDR5 modules can sometimes require a BIOS update or slightly reduced settings for stability. If the return policy is reasonable, testing the kit in your own system is the best way to see whether the speed difference matters.
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For the workloads you described, capacity is more important than memory speed. Running out of RAM and paging data to storage will hurt performance far more than dropping from DDR5-6000 CL36 to DDR5-5600 CL46. I’d choose the 64GB kit, especially since you’re already close to using all 32GB before gaming.
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MellowJuniper42: That makes sense. I’m usually running several demanding applications at once, so avoiding memory pressure is probably more important than keeping the ideal gaming memory settings.