Intel 80486 upgrade matrix

To determine what upgrades are available for Intel 80486 processors please consult the table below. Type and speed of original processor is listed in the first row. For each available Intel 80486 upgrade processor (listed in the left column) the table shows either the speed of upgraded system in MHz, or blank field if the original processor can not be upgraded with that specific upgrade processor. Currently, the table shows only Intel overdrive processors. Upgrade CPUs of other manufacturers will be added later.

	SX-16	SX-20	SX-25	SX-33	SX2-50	DX-25	DX-33	DX2-50	DX2-66
ODP486SX-20	32	40
ODPR486SX-20 1	32	40
ODP486SX-25			50
ODPR486SX-25			50
ODP486SX-33				66
ODPR486SX-33 1				66
ODP486DX-25						50
ODPR486DX-25						50
ODP486DX-33							66
ODPR486DX-33							66
SX2ODP50	32	40	50
SX2ODPR50	32	40	50
DX2ODP50	32	40	50			50
DX2ODPR50	32	40	50			50
DX2ODP66				66			66
DX2ODPR66				66			66
DX4ODP75	48	60	75			75
DX4ODPR75	48	60	75			75
DX4ODP100				100			100
DX4ODPR100				100			100
POPD5V63		50	63		63	63		63
POPD5V83				83			83		83

Notes:
¹ I can't find any information on this upgrade CPU. It is possible this part was never produced.

Processor types in the table are abbreviated. Full part numbers are:
SX-16 - A80486SX-16
SX-20 - A80486SX-20
SX-25 - A80486SX-25
SX-33 - A80486SX-33
SX2-50 - A80486SX2-50
DX-25 - A80486DX-25
DX-33 - A80486DX-33
DX2-50 - A80486DX2-50
DX2-66 - A80486DX2-66