Text 13067, 50 rader
Skriven 2006-09-27 10:09:48 av Rich Gauszka (1:379/45)
  Kommentar till text 13064 av Adam (1:379/45)
Ärende: Re: 80 core CPU?
========================
From: "Rich Gauszka" <gauszka@hotmail.com>


"Adam" <""4thwormcastfromthemolehill\"@the field.near the bridge"> wrote in
message news:45199d23@w3.nls.net...
> 80????
>
> 80?
>
> http://news.com.com/2100-1006_3-6119618.html?part=rss&tag=6119618&subj=news
>
>
> "Intel's prototype uses 80 floating-point cores, each running at
> 3.16GHz, said Justin Rattner, Intel's chief technology officer, in a
> speech following Otellini's address. In order to move data in between
> individual cores and into memory, the company plans to use an on-chip
> interconnect fabric and stacked SRAM (static RAM) chips attached
> directly to the bottom of the chip, he said."
>
>
http://www.infoworld.com/article/06/09/27/40OPcurve_1.html

If I had a vote, I'd have both vendors stop at four cores and focus on fat and
fast busses that give those cores something to fill instead of something to
wait for. AMD and Intel both face bus bottlenecks, and that's the bane of
multi-core. Presently, dual-core CPUs from both chipmakers have to share memory
and I/O buses that were designed to serve a single CPU core. Every time you add
a core, contention for access to memory and peripherals rises, lowering the
genuine performance benefit of the extra core. Even AMD's laudable design can't
deliver near-linear performance gains from additional cores. AMD is revamping
AMD64's total design for quad-core so that even when cores get stuck in
contention, the busses run so fast that the traffic clears quickly. AMD is
taking a run at getting third-party vendors signed up to place their
peripherals directly on its Hypertransport serial bus. If AMD can make that
work, then, potentially, every core can have direct access to system
peripherals. That would be a quantum leap for x86.

What worries me is that Intel might just go nuts bumping the number of cores,
clock speed, cache and front-side bus speed while more or less hewing to
today's Core Microarchitecture in terms of key factors like bringing its memory
and bus controllers on-chip. Let's say that AMD wants to hold fast at quad or
octo-core and work on perfecting the total system architecture so it can keep
up. But what if Intel keeps cranking on core and gigahertz? While AMD is
sledding along with eight cores, non-uniform memory architecture and direct
on-core bus links from everything to everything in the system, Intel might ship
a 16-way Core Microarchitecture CPU/chipset that looks more or less like
Cloverdale 4-way, except for more-you guessed it-cache, gigahertz and cores.

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