Xeon
Introduced in May 2013, Xeon E3-12xx v3 is the first Xeon series based on the Haswell microarchitecture. It uses the new LGA 1150 socket, which was introduced with the desktop Core i5/i7 Haswell processors, incompatible with the LGA 1155 that was used in Xeon E3 and E3 v2. As before, the main difference between the desktop and server versions is added support for ECC memory in the Xeon-branded parts. The main benefit of the new microarchitecture is better power efficiency.
Celeron
Introduced in April 1998, the first Celeron branded CPU was based on the Pentium II. Subsequent Celeron branded CPUs were based on the Pentium III, Pentium 4, Pentium M, and Intel Core. The latest Celeron design () is based on the seventh generation Core i3/i5/i7 series (Kaby Lake). This design features independent processing cores (CPUs), but with only 66% as much cache memory as the comparable Core i3 offering.