Thanks for the hint ("beast" descibes it perfectly :) ), seems mine is castrated: "Furthermore, it appears that although subsequently released MacBook, MacBook Air, and pre-"Mid-2010" Mac mini models all are equipped with "Core 2 Duo" 64-bit processors and 64-bit EFIs, Apple has blocked these "consumer-targeted" Macs from booting in 64-bit mode. iMac and MacBook Pro models released in 2007 with 64-bit EFIs seem to have been blocked as well."

Found @ https://everymac.com/mac-answers/snow-leopard-mac-os-x-faq/m...