I have a Wolfdale E8600 that was actually made in 2009, (late-production-run) but that won't be any different than the early-45nm chips before first-gen Core i, IIRC. The earliest I would expect with legacy-BIOS, if even possible, I suspect would be my Core i7 Extreme 965. (Bloomfield, 45nm, first-gen Core i7) The AMI-BIOS in socket 1366, looks just like late-socket-775.
At least what my socket 1366 system has, for the BIOS, does have issues with video cards, I suspect anything past Radeon R9 series and GeForce GTX 980 series. It certainly seems to hate my RX 580! Even when it boots and can game with it. Also, driver installation goes fine. It's an issue where when later cards are installed, then the BIOS only saves settings to RAM, LOL. If I unplug the PC, it's all reset!