This week at ISSCC, Intel made its first detailed public disclosures about its upcoming “Poulson” next-generation Itanium CPU. While not in any sense complete, the details they did disclose paint a picture of a competent product that will continue to keep the heat on in the high-end UNIX systems market. Highlights include:
Process — Poulson will be produced in a 32 nm process, skipping the intermediate 45 nm step that many observers expected to see as a step down from the current 65 nm Itanium process. This is a plus for Itanium consumers, since it allows for denser circuits and cheaper chips. With an industry record 3.1 billion transistors, Poulson needs all the help it can get keeping size and power down. The new process also promises major improvements in power efficiency.
Cores and cache — Poulson will have 8 cores and 54 MB of on-chip cache, a huge amount, even for a cache-sensitive architecture like Itanium. Poulson will have a 12-issue pipeline instead of the current 6-issue pipeline, promising to extract more performance from existing code without any recompilation.
Compatibility — Poulson is socket- and pin-compatible with the current Itanium 9300 CPU, which will mean that HP can move more quickly into production shipments when it's available.