Mystery blank 486(?)

[Cpuswe]

The left one is a 486 of some sort, but the right one?

[johnorun]

If you have a microscope, there may be a clue on the die.

[bccwchan]

will it be the cache controller.

[Chook]

I wouldn't think so. 486 era cache controllers were PGA, not SPGA.

[CPUShack]

is it even Intel lol
Looks almost MIPS like

[H3nrik V!]

Anyone able to count the pins? Might give a clue...

[Cpuswe]

If i count correctly its a PGA325.

The listing from eBay states they are from a Intel employee (not proving its an intel chip...)

[aberco]

Isn't there a Pentium class cache controller chip in PGA?

[Cpuswe]

[CPUShack]

die looks like maybe it was a thermal/electrical sample perhaps

[Neon_WA]

well the die & package of the left one matches early Intel DX2-50/66s
The DX2 in Genna's 80486 Promotion Kit matches it also
http://www.cpu-world.com/Memorabilia/80486/Promotion_kit/

The right one is interesting.. being a SPGA
guessing it is from post 1993, as the socket 5 was the 1st commercial SPGA and the earliest was week 43 1993
The earliest non processor in SPGA package was the 82498 cache controller, but the 1st samples of them wasn't until early 1995
and they were also socket 5 sized

even looking at other manufacturers it appears they didn't use the SPGA package until 1995.. and all were Pentium sized or larger

High res pics of the die is the only probably way of determining what this one is

Edit >> on a side note the earliest reference I can find for SPGA packages is a patent from May 1993.
The actual patent is for a SPGA processor removal tool originally lodged by Cyrix
The funny thing is that VIA (Cyrix) has kept paying money to keep the patent current

[Neon_WA]

[CPUShack]

Interesting the pinout is the same as the mystery (P6?) ES I got

[Neon_WA]

[Cpuswe]