Welcome to Boardsort™ - Learn - Sell - Profit -

Do medium an low grade mother boards go with regular medium an low grade board?or is that a different price?also does anyone know what year and model computer had the white Gold leg processor chip?

Motherboards are sorted by socket size and type (plastic from metal) only.
They don't sort by socket class.

As I've stated elsewhere the premise of grade, as in quality of board materials, is a misnomer for reasons I don't understand continue to permeate the escrap industry. Most point to red and blue boards yet a gigabyte red board for their gaming lines is actually a gold sandwich board, not copper, making internal recovery substantially higher than the common green boards.
If your told to sort by colour go somewhere else.

White ceramic processors come from many sources. The most common were computers from the USSR/CCCP. They make up around 75% of white CPUs.
The rest, date back to the early 70s-mid 80s in general.
Kit (or prebuilt kit) computers like the Altair, the Tandy 9x and 12x series, early commodore pet and 64 computers, and Texas Instruments systems. They are also found in digital calculators from the 70s (HP, IBM, Commodore), terminal units (Altair, Atari, Xerox) aerospace boards, (jet planes, rockets,) guided ballistics, military control panels.
The names and dates are what I know from experience. However there are many more places to find them. Especially in early 80s computers and 70s/80s terminals. Where they show up randomly; often as replacement parts.

As a side note the earliest Intel 4xxx chips were mostly white and Bell Labs' ICs for switching stations are also white, but both use platinum plated nickel pins. So if it's white, and not gold legs, have the legs tested by a trusted source or service.

And finally: sites to browse
http://www.old-computers.com/museum/default.asp

http://www.cpu-galaxy.at/CPU/cpu_overview.htm

especially here for white chips