I know most will think I am stupid but I just bought a binned 5ghz chip. My previous Kaby Lake managed 5ghz but the temps went to 94 degrees when stress testing and I wasn't impressed, even though it held.
I then sold my Kaby Lake and gambled for a binned chip. It arrived today and on the box it said 5ghz 1.35v. Fair enough, so I gave it a shot. All I can say is I am very happy, at the same 5ghz my temps were all below 65 degrees. That is a huge 30 degrees difference.
Now being new to binned chips, does this mean I cannot keep the same stability at 1.34v? Can I clock higher at 5.1? Have the binned 5ghz chips even been tested above 5ghz? It's just that if this chip has been fully tested to an inch of it's life and received no more performance, I don't want to waste my time testing it again. Regardless, it does the job for me. I know people won't pay an extra £100, but as a one off purchase, I am pleased.