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 AMD's Bulldozer: More Design Details Surface

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PostSubject: AMD's Bulldozer: More Design Details Surface   Tue Aug 23, 2011 2:24 pm

[color:2f0e=blue !important][color:2f0e=blue !important]AMD has released new documents outlining the architecture for its upcoming Bulldozer release.


http://www.tomshardware.com/news/amd-bulldozer-zambezi-processor-am3,13272.html


AMD's Bulldozer is one of the most highly-anticipated CPU
architectures in recent memory. For those who are eager for more info on
this new [color:2f0e=blue !important][color:2f0e=blue !important]processor design, some new slides outlining Zambezi for the Socket AM3+ platform recently surfaced.





Breaking down the eight-core "Bulldozer" die, we find four modules that are each composed of two cores. Each module packs 2 MB L2 cache for a total of 8 MB. The is also an integrated Northbridge that contains 8 MB of L3 cache, two 72-bit DDR3 memory channels and four 16-bit receive/16-bit transmit HyperTransport links.











From the slides, we also see how Turbo Core will
behave in Bulldozer. When the CPU's workload is within the TDP
headroom, there is no core boost activity. When there is TDP headroom in
given a workload, the Turbo Core kicks in and increases clock speed
across the board. Conversely, when there is a lightly threaded workload, half the modules go into C6 sleep state, and the remaining cores get clocked up higher for better [color:2f0e=blue !important][color:2f0e=blue ! important]performance.





See the full deck of slides at Computerbase.

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PostSubject: Re: AMD's Bulldozer: More Design Details Surface   Wed Aug 24, 2011 4:09 pm

By John Morris | August 24, 2011, 6:20am PDT


http://www.zdnet.com/blog/computers/amd-reveals-new-details-on-upcoming-bulldozer-chips/6587



Summary: At
the annual Hot Chips conference, AMD provided some new details on the
innovative Bulldozer architecture behind the upcoming FX Series for
desktops and Opteron server processors.






Within the next week or so AMD should begin shipping its FX Series
processors, its first high-end chip based on an entirely new core design
since the introduction of the Family 10h, better-known as Barcelona,
almost exactly four years ago. At the annual Hot Chips semiconductor
conference last week, AMD provided some new details on the innovative
Bulldozer architecture behind both the FX Series for desktops and new
Opteron server processors.



The new processor includes four Bulldozer modules, each of which
contains eight AMD64 cores, and an integrated memory controller. What
makes the Family 15h design different, though, is that each module
shares several components including a front-end (fetch and decode),
floating-point unit, data prefetch unit, and 2MB of L2 cache. AMD’s Sean
White said the shared units made it possible to pack more cores on a
smaller die and to increase the horsepower of the floating-point unit.
“The gist of what AMD is trying to do is use the area and the power in
the cores as efficiently as possible,” White said.



Bulldozer has several new instructions including some that are in
both AMD and Intel processors (SSE, encryption, and AVX for
floating-point operations) and some unique to AMD that fill in some
holes including FMA4 for HPC applications and XOP for numeric,
multimedia, and audio/radio applications. AMD also revealed that
Bulldozer will support DDR3 memory at speeds up to DDR3-1866. It
includes new power management features and AMD’s Turbo Core that
temporarily boost performance on single-threaded applications. The
eight-core Bulldozer processor is manufactured by Globalfoundries on its
32nm SOI (Silicon-On-Insulator) process, like the A-Series APUs for
mainstream laptops, and it measures 315 square millimeters.



The first Bulldozer processor is the socket AM3+FX Series (code-named
Zambezi) for desktops with eight cores and two memory channels for
U-DIMMs up to DDR3-1866. The FX Series is designed to be used with AMD
Radeon HD discrete graphics and the AMD 9-Series chipsets. Older Family
10h processors (Phenom II) are plug-in compatible with AM3+
motherboards. I’ve previously written about AMD’s FX Series (AMD bets on Bulldozer to take back the desktop).



Bulldozer is also designed to be used in new server processors that
should start shipping in September. The low-end server processor,
Valencia, is designed for one or two-socket server using the existing
socket C32 motherboards (Opteron 4000 series) with a BIOS update. It has
eight cores and two memory channels that support U-DIMMs, R-DIMMs or
LR-DIMMs up to DDR3-1600. At the higher-end, Interlagos is designed for
one- to four-socket servers using the existing G34 (Opteron 6000 series)
socket, also with a BIOS update. Interlagos has two separate dies with a
total of 16 cores in a single multi-chip package. The operating system
sees Interlagos as a single processor with up to 16 cores and up to 16MB
of L3 cache. Interlagos has four memory channels supporting U-DIMMs,
R-DIMMs or LR-DIMMs up to DDR3-1600.


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