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Enabling XMP took my machine from roughly one-third speed back to normal.

Huge red flag. XMP is not designed for use with memory-intense workloads like running LLMs.

3

I have a PC that has been crashing a lot recently, but only when running long RAM+CPU and RAM+GPU intensive tasks. It uses about 60%+ of ny RAM.

I ran a memory test for 9 passes, no errors. No errors with the CPU only, and no errors with GPU only.

So it can be the XMP that crashes it?

2

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Local LLM Inference Optimization: The Complete Guide | Spyke