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
The Celeron P1053 is an embedded processor for Socket 1366 from the "Jasper Forest" family. All other members of this family are known as Xeon C35xx or C55xx. The Jasper Forest chip is closely related to Lynnfield and contains four cores, 8 MB of L3 and a QPI interface, but most of these are disabled in the Celeron version, leaving a single core with 2 MB of L3 cache.