I have an alternative question
what's the best AM4 block for absolute performance?
I have just bought a Techn AM4 block after reading Igorslab review and watching a couple of German YouTube reviews ( temp graphs don't need translation ) as it beats the Heatkiller IV by a little bit but the EK Magnitude by a couple of degrees, it's not an looker though but I will have plenty of RGB puke going on and just wanted the best performance.
The Optimus Foundation seems to be highly rated but it has to be imported from America I think.
The Techn cost me £89 including shipping using a Revolut credit card from Germany and there's no Vat or import duty as its under £135.