They all behave a little differently. If you can do small FFTs in Prime or OCCT as well as a run of blend, you're generally good to go. Small FFTs stresses the core logic really hard, and blend stresses the memory and cache systems more. If you've already done that y-cruncher is probably a good bet. It will hammer the memory subsystem to a high degree and will test that angle a bit more.

If you are really interested in a high degree of stability, I'd suggest you run these tests for 24 hours instead of 8.

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@ Thread: Your guys are lucky with your chips. Both my 1055 and 1090 struggle with 4GHz at 1.55-1.575V.