I have tried all the BIOS versions in the last few months and with the F3h the overclocking performance has improved slightly (very slightly).
Unfortunately they are still too unstable! The VCCSA bug is back, the required voltages are still too high and sometimes the frequencies set on the CPU change by themselves, setting to 4.6 for no reason.
I am currently "stable" @ 4.8Ghz, Vcore 1.245, AVX -1 / AVX512 -2 and the rest of the voltages on AUTO because they didn't bring any improvement (IDLE 28-30°C, Full load 90°C).
Cinebench R23 it gives me an error after about 4 tests, sometimes even after the first test.
Unable to complete any test @ 4.9 and 5 Ghz (I didn't go beyond a 1.36v Vcore).
MacoOS Catalina, Opencore 0.7.4.
Has anyone experienced overclocking on this card recently?
I have not tested the F3h bios.
But here is what I have seen with the old bios and written in this forum before.
Maybe it's still a display bug ?
"" For the VCCSA:
With the Bios F3f and F3g ( maybe also the F3c, I have not checked).
When I put a voltage in the VCCSA about 3 times out of 10 all is well. But 7 times out of 10 the value displayed in the bios or in a software like HWinfo is the default value ( about 0.900v). It's strange, because as I said the bug doesn't happen all the time, about 7 restarts out of 10.
But this is not very serious. Because it is only a display bug. The real value used by the RAM controller is the one I entered in the VCCSA ( 1.150v in my case ) My Computer can't boot with only 0.900v ( if the RAM is overclocked and the Timing tightened ). I even did a Stress Test of the RAM when the bug occurs to be sure and do not have an error. So it is indeed a display bug. ""
Intel displays a max temperature of 86° max for the package cpu on the 10980xe. ( much lower than on other cpu, often around 95°)
I advise you to be careful if you go up to 90° (the "Die" of a cpu (especially with 18 cores) goes up much higher than the "package cpu") it can exceed 105°.
I personally set all the cores to 4.6 Ghz so as not to exceed 80° under full load. (with Gigabyte motherboard). whith Asus motherboard I put my least hot cores at 4.8 and 4.7 Ghz and the rest at 4.6ghz always for not to exceed 80° under full load. but it is impossible with Gigabyte bios )
If you want to be sure of the stability (especially for the AVX) do some video encoding with handbrake !
With cinebench and the special test for AVX, AVX2, AVX 512 from OCCT => everything was stable for me.
But as soon as I did video encoding with Handbrake (Mac version) => it crashed quickly (I was forced to lower the AVX2 offset)