So, as promised I ran the DOS benchmark suite on the Apple 7in PC card, and while most of the stuff ran pretty well, there's a few outliers that crashed or locked the whole PC up.
Quake: Out of memory error at startup, attempting to start from a fresh MS-DOS bootdisk yields the same thing.
Landmark: Starts up fine but then got a EMM386 crash. From a bootdisk it runs fine and reports that its running on a 459MHz AT with a 925MHz 287 (LOL)
TOPBENCH: Crash, regardless of using the bootdisk or with or without register enhancements.
DOOM and the other benchmarks ran fine without any weird things, regardless of register enhancements being enabled or not.
Proud owner of a Shuttle HOT-555A 430VX motherboard and two wonderful retro laptops, namely a Compaq Armada 1700 [nonfunctional] and a HP Omnibook XE3-GC [fully working :p]