Hardware
Intel's Six-Core Dunnington and Nehalem Microarchitecture Get Official
Posted by Matt Buchanan at 12:24 AM on March 19, 2008
The pair of 45nm Intel chips that Sun oh-so-kindly leaked last month just got all official-like. Dunnington is "the first IA (Intel Architecture) processor with 6-cores, is based on the 45nm high-k process technology, and has large shared caches." Six cores, exciting! But not as exciting as Nehalem, which is Intel's "dynamically scalable" new processor microarchitecture which'll bring "dramatic performance and energy improvements" to Intel's chips. And that means what?
The platform will scale from two to eight cores, and eventually from "notebooks to servers." That's the scalable part, so you'll see it everywhere. Simultaneous Multi-Threading will let each core run two threads at once, plus it quadruples the memory-bandwidth of the current top-o'-the-line Xeons. It's also got an 8MB level-3 cache, Quickpath interconnects (up to 25.6GB per second), integrated memory controller (AMD what?) and supports up to DDR3-1333 memory, plus a bunch of other hardcore geek stuff, which you can scope out at Intel. [Intel]

Comments (AU Comments · US Comments)
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digodemais
Posted 4:04 AM 19/3/08
Saying Nehalem copies Phenom is like saying Ferrari copied the Model T.
digodemais
Out2gtcha
Posted 4:04 AM 19/3/08
@Monty:
So this is more of a vapor-ware product for home usage as far as normal apps written for 2 cores or less?
I wonder what the ET is on the home side of this.......not that most any home user, (me included probably) would honestly have a need for it.
"Integrated memory controller" = About damn time!!
Out2gtcha
P3nnst8r
Posted 4:04 AM 19/3/08
@rainfever: I think it will come to benefit on more cpu-driven games, like Spore and its use of Procedural generation. Anything that deals with more logic than pure graphical horsepower.
P3nnst8r
matt buchanan
Posted 4:04 AM 19/3/08
@wetboxersguy: Onboard memory was one of the big advantages in AMD's chips. Now that Intel is following up, it's just another kick in the pants, really.
matt buchanan
strider_mt2k
Posted 4:04 AM 19/3/08
@Monty: Awesome!
I wasn't aware, not being in that area.
Thanks for the info!
strider_mt2k
rainfever
Posted 4:04 AM 19/3/08
As far as consumers go, i think gaming is the first area that will show dramatic increases in multiple processors. I dont know the itty gritty of programming, but I think developers are able to program so it scales to however many processors you can give it.
...then you're just limited by the videocard, and other bottleneck area's in your system. ;)
rainfever
Monty
Posted 4:04 AM 19/3/08
@strider_mt2k: You are absolutely correct, from a consumer perspective. However, from a business perspective, virtualized servers use every core they can toss in these things. We have eight cores (2 four core processors) in each server we use for virtualization, and if it had double the cores we would be able to use that, too.
That said, from a home user perspective, these processors simply do not make sense. Not yet, at least.
Monty
Terminal-Alkyne
Posted 4:04 AM 19/3/08
@wetboxersguy: Which is why I'm concerned about the Nehalem. See, AFAIK the reviews of Phenom have been that Core 2 is better. And now Intel is going down the same path that AMD went to.
Terminal-Alkyne
wetboxersguy
Posted 4:04 AM 19/3/08
Intel is copying AMD again. Nehalem's shared L3 cache is similar to Phenom's, the QuickPath/CSI is something AMD had years ago (HyperTransport), as well as the onboard memory controller.
wetboxersguy
yachius
Posted 4:04 AM 19/3/08
@strider_mt2k: Most bleeding edge-tech doesn't have consumer value right away. The consumer value will follow once the tech is integrated into some solutions and developers create apps that can utilize it.
On another point, we're seeing more developers creating apps that can utilize as much resources as there is available, specifically for server-based apps.
yachius
strider_mt2k
Posted 4:04 AM 19/3/08
@matt buchanan: I'm down with that. :)
strider_mt2k
matt buchanan
Posted 4:04 AM 19/3/08
@strider_mt2k: Nehalem is scalable, so you'll see its benefits hit consumer wares at some point—"notebooks to servers," notebooks being the key there.
matt buchanan
P3nnst8r
Posted 4:04 AM 19/3/08
Sexy times for encoding and multi-processor usage.
P3nnst8r
strider_mt2k
Posted 4:04 AM 19/3/08
But most applications are still written for two cores or less, am I correct?
Just looking for the consumer value here.
strider_mt2k
willyolio
Posted 6:18 AM 19/3/08
@Terminal-Alkyne:
no, the HT design is inherently better than the old FSB design. the core2 performs better than AMD's chips right now because Intel essentially brute-forced the FSB using their spare $billions, plus the processor itself IS better.
AMD still outperforms Intel on memory bandwidth though.
Intel knew they would have to abandon the FSB, and switch to HT eventually.
willyolio
brutek
Posted 6:18 AM 19/3/08
Amdahl's Law
brutek
aec007
Posted 8:30 AM 19/3/08
I read a while back about Nehalen on Maximum PC as the chip to watch.
Apparently it's frequency is adaptable to power usage unlike any other chips. If a core is not doing much it sends it into idle speed (low power / low Hz) and if a single core is doing most of the work it can overclock it by itself past 3 Ghz (or 4GHz) as total power dissipation will still be low since all other cores idle.
Pretty cool idea. That would increase overall system speed incredibly when you think about it.
aec007
Stang70Fastback
Posted 8:30 AM 19/3/08
I'm really glad automotive manufacturers don't use the same kind of naming scheme as these people...
Stang70Fastback
cad3
Posted 10:40 AM 19/3/08
I've found it's best when the applications are only written to use a single core. Mostly because the majority of applications aren't written well and sooner or later they try to steal 100% of the CPU. But in the case of mulitple cores, they only steal a single full core.
Right now, I have 2-3 different Adobe apps that think they should be given full and sole CPU usage. Google's Picassa will do that as well if left up for a while. McAfee does it so often I've had to uninstall the program entirely. Firefox on occasion gets a little out of control. All told, I'm thinking 8 cores would be PERFECT. All of these different apps could steal a single core and I'd still have a couple of cores left over to still be able to use my box and do important stuff, like play Spider Solitaire. :)
cad3
imagine-engine
Posted 4:31 PM 19/3/08
I'd be impressed if Intel could make an 8 core 64-bit mobile processor for mobile workstations such as the MacBook Pro ;-)
imagine-engine
johnnnD
Posted 12:03 PM 21/3/08
@imagine-engine:
yeah and the battery life will last 3 mins.
johnnnD