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I'm on a haswell core i7 but pcsx2 only detects up to AVX and FMA support when my CPU has AVX2 as well. I also notice there is a gsdx avx2 but pcsx2 sets it to gsdx AVX by default. I would like to know is AVX2 being utilized by gsdx when I set it to use the AVX2 gsdx?
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PCSX2 doesn't list AVX2 as a detected instruction set, don't worry. The only thing that will use AVX2 is GSDX Software Mode, but that may bring little benefit over AVX, but you might as well use it if your cpu supports it.