When apple started their intel transition, intel used 32 bit CPU’s primarily. The first intel macs (core Duo) and intel dev kits were 32 bit, the core 2 duos onward were 64 bit. It’s really a small amount of Macs.
The previous gen, P4 and P-D were already 64-bit, XP 64-bit and 2003 64-bit was out, Linux was 64-bit for years; Core Duo not being 64-bit was a stop-gap and everybody knew that. Creating new ABI on that was exactly like launching a new Carbon project today, that's why I compared these two in the first place.
Nah. P4s, a gig of SDRAM, either a GMA 800 or GMA 900 for graphics, a 1x and a 16x PCIe slots, a 160GB disk and a DVD drive all running on the first Tiger service pack (10.4.1). Yours for 18 months for only $999! (‘Twas a rental.)
Late Pentium 4 in a pretty much random standard PC motherboard, I think it didn't even have EFI (even the broken 2001-vintage one that was common for years on x86 Macs).
