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Intel P II OverDrive
  Intel Pentium II OverDrive PODP66X333
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The Intel Pentium II OverDrive Processor
The Pentium II OverDrive is a processor upgrade designed for Pentium Pro (Socket 8) based systems. By using the 0.25 micron Deschutes core of the Pentium II, Intel managed to put a quick end to the 16-bit weakness of the Pentium Pro, and in doing so, they also managed to double the amount of L1 cache on the processor to 32KB. The PII OverDrive is nothing more than a Pentium II Xeon on a smaller scale, using the Pentium II's design to place the L2 cache externally off of the CPU, but on a card that would allow it to operate at the same clock speed as the CPU itself. The chip has a built in clock multiplier of 5.0x, and it derives its clock speed based on the motherboard's set FSB frequency, so on a 60Mhz board (150/180MHz Pentium Pro systems) the processor operates at 300MHz, on 66MHz systems (166/200MHz Pentium Pro) at 333MHz.
References:  Intel  Introduction Press Release
Intel Pentium II OverDrive PODP66X333
Intel Pentium II OverDrive PODP66X333 Top Side
PODP66X333 SL2KE V1.0
pentium II overdrive
Intel Pentium II OverDrive PODP66X333 Back Side
Intel Pentium II OverDrive PODP66X333 Top Side
Upgrades 150 and 180MHz Pentium Pro based systems to Pentium II 300MHz, 166 and 200MHz Pentium Pro based systems to Pentium II 333MHz.
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Core Frequency:333 MHz
Board Frequency:66 MHz
Clock Multiplier:5.0
Data bus (ext.):64 Bit
Address bus:36 Bit
Circuit Size:0.25
Core / I/O Voltage:2.0 / 3.3 V
Manufactured:week 20/1999
L1 Cache:16+16 KB
L2 Cache:512 KB
Intel S-Spec: SL2KE
Package Type:Plastic
Socket: 8
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