This CPU should be released in the second half of 2008 and will sport numerous technology improvements compared to Penryn-based Xeon. Xeon Nehalem will be true quad core CPU and not two dual core associated on the same die. Cores will not only share their cache memory, but the entire cache system. Among other features:
- Leverages 4-issue Intel Core micro architecture technology
- Simultaneous multithreading (SMT)
- Multi-level shared cache architecture
- Performance-enhanced dynamic power management
- Fully unlocks Intel 45nm Hi-K silicon process benefits
As mentioned, multithreading support is back, but it will have little to do with the original HyperThreading found on the Pentium 4 architecture. If fact, SMT will fully unveiled its capabilities with the Nehalem, as HyperThreading was just an implementation of SMT. SMT will allow an eight physical cores-based computer to feature 16 logical cores.
In addition, Intel unveiled details concerning the chipset architecture which will be associated to the Nehalem and known as Tylersburg which will be available in 3 variants: EN for entry servers, WS for workstations and EP for efficient performance servers. It will also sport the QuickPath technology, Intel's new uniform bus previously known as Common System Interface, which resembles AMD HyperTransport. It should dramatically speed up communication between components.
First Nehalem and Tylersburg should not appear before one year, and Intel will probably release additional information in a near future. Apple might then use Tylersburg WS for Mac Pro and Tylersburg EP for Xserve.
