At the Hot Chips conference last week, Intel disclosed additional details about the upcoming Poulson Itanium CPU due for shipment early next year. For Itanium loyalists (essentially committed HP-UX customers) the disclosures are a ray of sunshine among the gloomy news that has been the lot of Itanium devotees recently.
Poulson will bring several significant improvements to Itanium in both performance and reliability. On the performance side, we have significant improvements on several fronts:
Process – Poulson will be manufactured with the same 32 nm semiconductor process that will (at least for a while) be driving the high-end Xeon processors. This is goodness all around – performance will improve and Intel now can load its latest production lines more efficiently.
More cores and parallelism – Poulson will be an 8-core processor with a whopping 54 MB of on-chip cache, and Intel has doubled the width of the multi-issue instruction pipeline, from 6 to 12 instructions. Combined with improved hyperthreading, the combination of 2X cores and 2X the total number of potential instructions executed per clock cycle by each core hints at impressive performance gains.
Architecture and instruction tweaks – Intel has added additional instructions based on analysis of workloads. This kind of tuning of processor architectures seldom results in major gains in performance, but every small increment helps.