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The Pentium II Processor was launched on May 7, 1997, and was the first P6 core aimed at the consumer market.
At its heart was a tweaked Pentium Pro with enhanced 16-bit performance and the MMX instructions as found in the Pentium MMX incorporated.
The biggest differentiator between the Pentium II and the Pentium Pro however was in the use of off-package cache, with 512KiB of L2 cache instead being found running at half the CPU clock on the PCB, facilitated by the move to the SECC (Single Edge Contact Connector) interface.
Initial Pentium II Processors used the Klamath core. This was built on a 350nm process.
Later this was changed to the 250nm Deschutes core, introduced in January 1998, and significantly reduced temperatures compared to the Katmai. It also saw the introduction of the 100MHz Front Side Bus and found its way into laptops in the form of the reduced voltage Pentium II Mobile (Tonga) and with 256KiB on-die L2, as opposed to 512KiB off-package, the Mobile Pentium II PE (Dixon)
| Derivative |
Interface |
FSB Frequency |
Clock Frequencies (MHz) |
Technologies |
| Klamath |
Slot 1 |
66MHz |
233, 266, 300 |
350nm process, MMX SIMD Instruction set |
| Deschutes |
66 or 100MHz |
266, 300, 333, 350, 400, 450 |
250nm process, MMX SIMD Instruction set |
| Tonga |
MMC-1, MMC-2 |
66MHz |
233, 266, 300 |
| Dixon |
BGA1 |
66MHz |
266 - 400 |
250nm process, MMX SIMD Instruction set, on-die L2 cache |
A Klamath core 266MHz chip, owned from new. The Klamath chips can be differentiated from there equivilant speed Deschutes chips by the larger OEM heatsink due to the extra heat produced by chips fabbed on the 350nm process.
Working when pulled from old system.
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