Dell part number 8979D is a single-core Intel Pentium II Xeon processor operating at 400MHz with a 100MHz front-side bus and 512KB L2 cache. This is a legacy server CPU from the late 1990s, designed for dual-processor capable systems. Typical applications include older Dell PowerEdge servers such as 1U and 2U rackmount models from that era that require CPU upgrades or replacements. The processor uses Intel's Slot 1 cartridge form factor. Refurbished units are suitable for maintaining legacy systems or building out test environments where modern compute requirements are not a factor. Tested and guaranteed; available via quote.