Processor compatibility issue warning on update to ESXi 6.5

Hello,

During update to ESXi 6.5, I have a warning about a possible compatibility issue with my processor (Intel(R) Xeon(R) CPU X5450). I cancelled the update. It works fine right now with ESXi 6.0. Is there really a risk to make the update ? Is there a temporary issue or the compatibility with the process has been removed ?

thanks

iosman