PCI Express

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Any ideas as to how long PCI Express will be the dominant video
bus type?  Is its replacement on the horizon?  I don't want to
my mobo and then see PCI-E 2.0 everywhere a week later.

Re: PCI Express

bob@coolgroups.com wrote:
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PCI Express 2.0 already exists :-)

It doubles the transfer rate of a single lane. I believe
it is a feature of Intel X38, for example. This is from the
X38 datasheet.

    "PCI Express Interface
     Two x16 PCI Express ports
     Compatible with the PCI Express Base Specification, Revision 2.0
     Raw bit rate on data pins of 5 Gb/s resulting in a real
     bandwidth per pair of 500 MB/s"

This is from Wikipedia:  http://en.wikipedia.org/wiki/PCI_Express

    "Intel's first PCIe 2.0 capable chipset is the X38 and boards are
     already shipping from various vendors (Abit, Asus, Gigabyte) as
     of October 21, 2007.  AMD starts supporting PCIe 2.0 from its RD700
     chipset series. NVIDIA has revealed that the MCP72 will be their
     first PCIe 2.0 equipped chipset."

I don't know if there are any video cards that use it yet or not.
It isn't something I've been tracking.

Like SATA, this is supposed to be backward compatible. So the
lowest common denominator would pick the operating speed of
the interface. An X38, used with an existing video card, would
run at the "normal" PCI Express rate.

PCI Express will be dominant for some time. The reason is, it
is an "ideal" technology. Unidirectional point to point serial.
Using few pins per interface (i.e. per lane). Operating at as high a
frequency as FR4 PCB can allow (cheapest commodity substrate
for electronic devices). It might go out of favor, if some other
interconnect media became dominant (optical links - direct from
silicon to silicon). FR4 has been around for a long time, and
I don't see that changing soon, no matter how whizzy some of the
tech announcements get. The only way FR4 could be dislodged, is
if something cheaper comes along.


Re: PCI Express

bob wrote:
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PCI Express will eventually supersede AGP, PCI, and PCI-X busses.

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PCI Express 2.0 is both backward and forward compatible with PCI Express 1.0
and 1.1.


These are PCI Express 2.0 video cards.

Re: Re: PCI Express

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Don't forget ISA, EISA, and VLB. :-)
The Bill of Rights - Void where prohibited by Law.

Re: PCI Express

On Tue, 20 Nov 2007 18:50:15 -0800 (PST), bob@coolgroups.com

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Given the vast increase in bandwidth of PCI Express and it's
successive version 2 which is backwards compatible, it is
unlikely a replacement will be necessary for several years
(never say never, but I don't forsee a change making it
incompatible for at least 6 years).

Re: PCI Express

PCI-E 2.0 is scheduled to be released in 2008, probably the first half of
the year.

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