Does it make sense to use 4x32Gb RAM or 2x64Gb is the only reasonable option?

Reddit r/LocalLLaMA / 3/28/2026

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Key Points

  • The post asks whether upgrading from 2x32GB DDR5 to either 2x64GB or 4x32GB makes sense for running larger/faster local AI models and gaming, given availability and price constraints for 2x64GB sticks.
  • The author notes that 2x64GB options are scarce at the desired DDR5-6000 speed and may require using lower-speed/higher-latency modules (e.g., 5600MT/s, higher CL).
  • A key alternative considered is adding two more identical 2x32GB modules to use all four motherboard RAM slots, with concerns about memory speeds/timings and potential slowdowns affecting partially RAM-offloaded model workloads.
  • The post seeks guidance on whether the RAM configuration (4x32 vs 2x64 with worse timings) will produce noticeable real-world differences or whether other bottlenecks (especially GPU) will dominate performance.
  • The question is essentially a hardware capacity vs bandwidth/latency trade-off for local LLM use, while also weighing whether the impact would matter for video games.

Hi, I currently own:

GPU: RTX5080

CPU: AMD 9950 x3d

RAM: 2x32Gb DDR5 6000MT/s 30CL

Aaaaand I'd like to slowly gear up to be able to run bigger models OR run them faster. Obviously GPU is an important factor here (and I'm planning to change it to RTX5090), but the immediate and cheaper upgrade is to increase my RAM.

I could buy 2x64Gb instead of my current 2x32Gb (but with worse stats, 2x64Gb are hard to get now and almost nonexistant with 6000MT/s. I found some available with 5600MT/s and 40CL though)... But changing my RAM to 2x64Gb, while probably better, is also much more expensive.

Another option is to buy the same 2x32Gb that I currently have and put it next to my current RAM. (my motherboard has 4 sockets)

But I wonder how much it might slow down interference for models that are partially offloaded to RAM? As far as I understand, it might slow the RAM down (not sure how exactly it works, I'm not good at hardware xd), but I also don't know if it will be an issue in case of running models or playing video games (two things I care about on that PC). Maybe the bottleneck is actually somewhere else and runnning 4x32GB RAM instead of 2x64Gb won't give me any noticeable difference?

So... do you know if it's worth trying? Or I should totally abandon this cheaper idea and go for 2x64Gb with worse parameters?

submitted by /u/Real_Ebb_7417
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