Oh, I see. It just has to do with the stores from which they where sold ? And slight configuration changes.
The “IBM PS/1 “Consultant” are usually 486sx-25 CPU with 4mb ram and ET4000 graphics. 8kb cache. With NO cache upgrade available. CPU upgradable with Intel overdrive OPD486SX-25 486sx25@50mhz. With NO Math-co processor Or Intel DX20DP66 overdrive with Math-co Processor or Intel DX40DP75 Overdrive CPU.
The “IBM Essential” is a 486dx CPU with 8mb ram and Cirrus logic 542x video with cache upgrade up to 256kb.
CPU upgradable with Intel 486dx2-66 or 486dx4-100 Overdrive CPU.
The “IBM Multimedia” edition comes with a 486dx-50 CPU, 8mb ram and upgradable to 256kb cache.
CPU upgradable with Intel 486dx2-66 or 486dx4-100 Overdrive CPU.
So this “IBM PS/1 Investor” must have been a highly upgradable version. Originally came with a 486dx2-66 CPU, 8mb ram. Cache upgradeable to at least 256kb.
CPU upgradable with Intel 486dx2-66 or 486dx4-100 Overdrive CPU or Pentium Overdrive CPU.
So you want to stay away from the IBM PS/1 Consultant “Value” model.( low end model ).
And the “Investor” being the top of the line PS/1.
Low end to High lists:
PS/1 expert ( small case, 25MHz/20MHz Intel i386SX) ( 1993 )
PS/1 Consultant - Value, 486sx-25 ( 1993 )
PS/1 Advisor
Ps/1 Essential 486dx ( 1993 )
PS/1 486dx Multimedia with sound blaster and 2x CDROM ( 1994 )
PS/1 486dx Investor with Sound Blaster and 6x CDROM ( 1994 )