When AVX first came out it did make the process of overclock stability tuning more difficult, because the was a desire to test under both AVX and non-AVX pathol

When AVX first came out it did make the process of overclock stability tuning more difficult, because the was a desire to test under both AVX and non-AVX pathological load conditions. Sometimes the change in voltage drop over the die, along with the frequency change, would cause instability in one case but not the other. Having gone through the process, I could understand how this would be an annoying feature that violated previous assumptions about how Intel CPUs work.