Summary

MSI (Message Signaled Interrupts) mode is a Windows feature designed as a way for hardware devices like your graphics card (or GPU, if you're a purist) to grab the attention of and communicate with your CPU. Introduced in the PCIe 2.2 specification and then baked into Windows Vista, it's a specialized setting that modders and tweakers all too often talk (recklessly) about as if it's some hidden performance unlock.

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