This is being sold as used, however, I think it is new.
I bought 2 of them and used one of them for a friend
years ago and it worked great.

If I recall correctly this would upgrade where other chips
may not.  I believe we used the one to upgrade a 486SX
system and it worked great (if I am recalling correctly).

The third picture is the same upgrade (older), with a
passive heatsink versus the one I am selling which comes
with a fan.

Sold AS-IS. 

Please do your own research and due diligence before purchasing.
I have included all the info I was able to locate.  If you have any
additional info on this upgrade please e-mail me.

Only have this one that I know of - extremely rare.

Has been stored in a static bag for over 10 years.  Pictures represent
the correct item.  This one appears newer then the ones in the picture
as it has an active heatsink and smaller transistor.

EverGreen /am5x86 QFP

am5x86-133 QFP package is soldered on the PCB.
4x/3x speed selectable, WB/WT selectable, socket
position selectable for Normal/Overdrive.

Jumper block from left to right

Left:  Socket type select:
         OD for Overdrive socket and the other for standard ZIF
         or main socket.

Center: Clock multiplier:  left-center for 3x,  center -right for 4x

Right : L1 Cache status, left-center for  WT, center -right for WB