What does it take to upgrade my 486 to a Pentium OverDrive processor (P24T)?
• The Pentium OverDrive processor for the 486 (P24T – PODP5V), requires a computer that is compatible with write-back mode for the L1 (on-chip) cache. Or it must be allowed to switch into write-through mode. Otherwise, an interposer would have to be used to disable write-back mode. Lack of support for write-back mode will often show up as a malfunctioning floppy drive after the CPU upgrade. Strange but true. This only applies to motherboards based on the SiS 85C471 chipset. • The chip also requires a computer that accepts the unique P24T pinout, which is different from the 486DX or 486SX pinouts on previous Intel 486 processors. The P24T has a pin that disables any on-board processor, but in some cases (with older P24T’s), this may not work properly and the motherboard would need to have a jumper that manually disables any on-board chip. The CPU is either a 237-pin (83MHz) or 235-pin (63MHz) chip that only fits in sockets 2 and 3. It accepts a 5 volt setting and has a fixed 2.5x multip
