Sun Leaks 6-core Intel Xeon, Nehalem Details
February 25, 2008 3:11 AM
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An document consistent with Intel roadmaps details the company's upcoming 6-core processor
The same slide deck details side-by-side projections of Nehalem with other AMD and Intel processors
George Out estimates the floating point point and integer performance by extrapolating datapoints on the slid
Sun confirms what Intel has been dying to tell us, at least off the record
Late last month in Austria, Intel presented Sun with roadmaps discussing details of its upcoming server platforms, including the fairly secret Xeon
architectures. Unfortunately for some, this presentation ended up on Sun's public web server over the weekend.
, Intel's 45nm six-core Xeon processor from the
family, will succeed the Xeon
is essentially two 65nm Core 2 Duo processors fused on one package,
will be Intel's first Core 2 Duo processor with three dual-core banks.
includes 16MB of L3 cache shared by all six processors. Each pair of cores can also access 3MB of local L2 cache. The end result is a design very similar to the AMD Barcelona quad-core processor; however, each
core contains 512KB L2 cache, whereas
cores share L2 cache in pairs.
To sweeten the deal, all
processors will be pin-compatible with
, and work with the existing
chipset. Intel's slide claims this processor will launch in the second half of 2008 -- a figure consistent with previous roadmaps from the company.
The leaked slide deck also includes more information about Intel's
is -- 45nm, SSE4, quad-core -- and then some. For starters, Intel will abandon the front-side bus model in favor of QuickPath Interconnect; a serial bus similar to HyperTransport.
Perhaps the most ambitious aspect of Nehalem? For the first time in 18 years Intel will pair its processors cores up with on-die memory controllers. AMD
made the switch to on-die memory controllers in 2003
. For the next three years its processors were almost unmatched by Intel's offerings. The on-die memory controller can't come a moment too soon. Intel will also roll out tri-channel DDR3 with the
, and all that extra bandwidth can only be put to use if there are no bottlenecks.
As noted by
blogger George Ou,
the slides contain some rudimentry benchmarks
and other publicly available processors. From this slide deck, Ou estimates Nehalem's SPEC*fp_rate_base2006 at 163 and the SPEC*int_rate_base2006 at 176. By contrast, Intel's fastest
Xeon X5482 pulls a measly 80 and 122 SPEC fp and int rate_base2006.
processor more than doubles the floating point performance of its current
-family processors. Ou adds, "We’ll most likely know by the end of this year what the actual scores are, but I doubt they will be more than 5% to 10% off from these estimated projections."
It's important to note that these estimates are not actual benchmarks. Intel's document states, "Projections based on *SPECcpu2006 using dual socket Intel Xeon 5160 Processor performance as the baseline." As discussed on
offer little substance in favor of the real deal.
As of February 2008,
the company plans to launch
in Q4 2008
Sun has since removed the slide deck from its website.
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RE: Intel's first CPU with IMC?
2/27/2008 9:34:14 AM
I agree with you that it might be a marketing tool to support their cause for not keeping MC on die.. But its a matter of fact that if your CPU has 4yr cycle and North bridge has 2yr cycle, you want to have the overall system performance to go up with newer tech.
That aside, i don't even think your explanation is even close to the one given earlier. Why would CPU freq not scale well if you want to put a IMC? It damn sure will be in a separate clock well which will have no correlation with the CPU frequency scaling... Though you will be wasting precious high-speed silicon for slower IMC :)
I agree with the FSB hypothesis... Being a 90% market holder (back then) and with scores of people developing programs, its a lot of pressure on Intel to change its architecture. I don't blame FSB... Sweet FSB made first Core2duo to Core2quad in less than 3 months and a year b4 AMD's Phenom(enal???)... which BTW the highest version in the market performs under Q6600 (not even penryn! :( )...
No taking Sides! :) Just my opinion...
"Game reviewers fought each other to write the most glowing coverage possible for the powerhouse Sony, MS systems. Reviewers flipped coins to see who would review the Nintendo Wii. The losers got stuck with the job." -- Andy Marken
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