Intel sneak peeks Westmere EP server silicon
Four and six cores, Turbo Boost, AES
With IBM and Intel gearing up the high-end Power7 and "Tukwila" Itanium launches for next Monday, Intel's preview of its "Westmere-EP" processors for servers and workstations and a slew of research projects was always going to get lost in the shuffle.
The preview is set for Monday as the International Solid State Circuits Conference kicks off in San Francisco. But in an apparent effort to prevent the preview from being lost amidst all the talk of the Power7, Intel gave the press a preview pre-brief this morning, showing off the papers it plans to present at the conference.
Chip makers will be chip makers.
Separate from the conference, Intel is also launching the long-overdue quad-core Tukwila Itanium. But that is a separate story, which you can read all about here.
The Westmere-EP chips are kickers to last year's quad-core Nehalem-EP Xeon 5500 processors, which were launched at the end of March 2009 and which have very much helped keep the server business staggering along, somewhat bewildered but not falling completely down, throughout last year. With a shrink to the second generation of Intel's high-k metal gate 32 nanometer wafer baking processes from the 45 nanometer tech used to make the Xeon 5500s, it wasn't hard to guess that Intel would be adding some more cores to or cranking the clocks on the Westmere-EPs.
As it turns out, and as you no doubt figured out because there is a speed limit on clock speeds enforced by the Thermal Police these days, Intel is going to be adding more cores and more on chip cache to the Westmere-EP chips.
Specifically, the Westmere-EP is using the extra transistor budget that the slide from 45 to 32 nanometer processes allows to add two more cores to the processor and to boost the on-chip L3 cache by 50 per cent to 12 MB per chip. Nasser Kurd, senior principle engineer at Intel's Architecture Group confirmed to El Reg that Intel will deliver four-core variants of these chips. Nasser also confirmed that the Westmere-EP chips will support Turbo Boost, which allows for the clock speed of the processor cores to be jacked up a bit as other elements of the chip are quiesced.
Generally speaking, the Westmere-EPs will have the same clock speed range and the same thermal envelopes as the existing Xeon 5500s, but Intel is has not yet announced specific SKUs and won't until the middle of March or so when these new chips are formally launched. The Westmere-EPs will plug into the same sockets and use the same chipsets and DDR3 main memory as the Xeon 5500s and have three memory channels per socket like them as well.
The 32 nanometer, six core Westmere-EP chip
The six-core Westmere-EP chip has 1.17 billion transistors and is 240 square millimeters in size. As you can see from the pretty picture above, it is implemented in two halves of three cores each. The core regions have their own clock speed and power supply, and with the tweaks to the Westmere design the L3 cache and memory controller regions - what Intel calls the "uncore" areas - get their own, separate power gating.
Next page: Uncore power gating