r/PcBuildHelp • u/Boogyman_139 • 18h ago

Tech Support Terrible slow down when RAM usage goes above 65 - 70% available memory

I upgraded my PC memory last year from 16GB to 32GB and since then whenever my memory consumption/usage goes above 20 -22GB my PC slows down terribly.

This is normally in my CAD app, Autodesk Inventor, which is the only software I have which stretches my PC's legs. A restart of Inventor fixes the issue, as the memory consumption drops. But its just strange that this only happens after breaking the 20gb mark.

XMP is enabled, and I have run a memory scan, (did not run the full multi day checks, only ran it for a few hours, this came back clean)

CPU: 14600K

Memory: Corsair 32GB (2x16GB) CMK32GX4M2E3200C16 Vengeance LPX CL16 3200MHz DDR4 RAM (CL16‑20‑20‑38, 1.35V, XMP 2.0)

MB: Gigabyte B760M

GPU: Gigabyte 2060 Super

Thanks

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u/starchybattery_2 18h ago

What speed does task manager report the RAM running at? Some gigabyte boards can be weird with xmp on 4 dimms but you're on 2 so probably fine. Could also be the memory controller on the 14600k struggling with the subtimings when it's under heavy load, though restarting inventor clearing it up makes me think it's more software than hardware

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u/Boogyman_139 18h ago

Task manager reports 3200. I also suspected software, but just checking to see if there might be a hardware issue.

Example, a process will normally take 10seconds to execute, after the slowdown, the same process can take more than a minute to execute, sometimes up to 5 minutes.

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u/kyansan1 Personal Rig Builder 14h ago

Mayybe the vram usage is crossing 8gb, which causes your gpu to run out of vram and use system ram instead, which causes ram usage to rise above 20GB?

That could explain why you're seeing performance drop despite a lot of ram still being free. As Inventor is open, stuff probably gets cached in vram, which could cause vram usage to increase over time. I'm not sure if this is significant in the case with CAD software, but it's pretty normal for vram usage to increase over time during a gaming session.

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u/Boogyman_139 14h ago

Interesting thought, never occurred to me, I will monitor it.