Re: AMD64 mainboard with X-PCI ?
You are correct.
PCI-X is NOT PCI-Express.
PCI-X is an extention of PCI.
PCI-X is backwards compatible with standard PCI provided the expansion
card can accomodate both 5v and 3.3v signaling. This is a parallel "bus".
PCI-Express is a new I/O expansion technology based on a Serial P2P
connection. They are not backwards compatible with standard PCI or PCI-X.
Many news sites have never seen a PCI-X slot and automatically use the
PCI-X name to refer to PCI-Express. This is incorrect as the PCI-X name
is already taken.
PCI-X is usually found on 2+ cpu motherboards for expansion purposes
such as RAID controllers or Gigabit Ethernet controllers or anything
else that requires more than 133mb/s of bandwidth. Its only recently
that they've made a very minimal appearance on uniprocessor motherboards
in the form of Socket 478 for P4, however not the A64. The reason for
this is chipset.
Intel has the 6300ESB southbridge which has both a conventional PCI bus
and a PCI-X 64-bit 66mhz bus. You can pair this southbridge up with
the i875p for a great workstation board. On the A64 front, its either
all desktop or all workstation/server. There is no uniprocessor A64
boards with PCI-X. The only Hypertransport->PCI-X tunnel chipset
available at the moment is the AMD-8131/8132 which is currently found
only on large EATX sized dual Opteron motherboards.
Mattias Wadenstein wrote:
On Sat, 23 Oct 2004, In The Night wrote:
Some snippet from another news-site:
The New PCI bus; PCI Express
One of the biggest changes to the PC this year will be the
introduction of a new PC bus called PCI Express (PCIX). PCIX will
replace the current PCI bus that has a speed of 133 Mb/s, with a new
bus that has speeds that start at 250 Mb/s and can scale to over 1000
Mb/s. PCIX will also replace the Accelerated Graphics Port (AGP). So
new graphics cards will no longer have to fit in only one slot.
Motherboards with the PCIX bus should start appearing this Summer, so
new graphics cards that use the PCIX bus should start appearing
shortly thereafter. Makes you wonder if we'll see new PCIX
motherboards with AGP slots for those that want to keep using their
If they're not totally wrong, then:
PCI-X = PCI Express
Well, they are totally wrong.
PCI-X is basically a 64-bit pci bus commonly clocked at 100 or 133MHz.
PCI Express totally different, based on a high-speed serial line
I do manage a bunch of computers with PCI-X and I have seen PCI
Express slots in person. They are very different.
Ben Wang (email@example.com) wrote:
In The Night wrote:
Ben Wang (firstname.lastname@example.org) wrote:
There won't be any A64 boards with more than PCI 32-bit 33mhz.
Snip from ananova:
VIA just launched their first reference boards using PCI Express on
Athlon 64. Later this month, we also expect new Athlon 64 chipsets
others that will add PCI Express capabilities to the Socket 939
While these new chipsets could migrate later to Socket 754
the new chipsets will launch with Socket 939.
This will further push the 754 to the value side of the Athlon 64
I am referring to PCI and its derivatives (64-bit PCI, PCI-X, etc). By
more, I am referring to one of those derivatives and not PCI-Express.
There is no doubt PCI-Express (which is not what is required here) will
be available soon on the AMD platform.
This is a chipset limitation as all current chipsets only support PCI
32-bit 33mhz. I have never seen a 32-bit 66mhz slot (doesn't mean it
doesn't exist but highly unlikely on the A64 platform), most of the
66mhz devices are connected to 64-bit slots.
Look for motherboards with the AMD-8131/8132 chipset but you'll most
likely find them only on dual Opteron boards in EATX form factor.
Michelle Konzack wrote:
Am 2004-10-22 17:38:02, schrieb Kyuu Eturautti:
I haven't tried network cards, but I have some Adaptec 29160
controllers in 32 bit slots and I haven't run into any problems on
64 or other systems with only PCI-32/33 slots.
I know, but I need 64-Bit CPU and speed on network.
I have checked more then 30 AMD-64 mainboards but they have only
PCI-32/33 and not PCI-32/66.
If I can find an AMD-64 mainboard with minimum one 66MHz PCI slot
it will me help too.
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