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Matrox announces PCIe x1 graphics card

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Anonymous
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July 13, 2005 2:05:21 PM

Archived from groups: comp.sys.ibm.pc.hardware.video,comp.sys.ibm.pc.hardware.chips (More info?)

Well we've seen the high performance x8 and x16 graphics cards, but not
any that work on x1 slots. Probably good for multiple monitor
workstations.

http://www.gisuser.com/content/view/6281/

Yousuf Khan
Anonymous
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a b U Graphics card
July 13, 2005 6:27:38 PM

Archived from groups: comp.sys.ibm.pc.hardware.video,comp.sys.ibm.pc.hardware.chips (More info?)

YKhan wrote:

> Well we've seen the high performance x8 and x16 graphics cards, but not
> any that work on x1 slots. Probably good for multiple monitor
> workstations.
>
> http://www.gisuser.com/content/view/6281/

In principle the x16 boards should work in x1 slots, however you'll have to
butcher one or the other of the connectors to get them to fit.

In practice I'd be very surprised if this worked the way it was supposed to.

> Yousuf Khan

--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)
Anonymous
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July 13, 2005 6:29:10 PM

Archived from groups: comp.sys.ibm.pc.hardware.video,comp.sys.ibm.pc.hardware.chips (More info?)

J. Clarke <jclarke.usenet@snet.net.invalid> wrote:
> YKhan wrote:
> > Well we've seen the high performance x8 and x16 graphics cards, but not
> > any that work on x1 slots. Probably good for multiple monitor
> > workstations.
>
> In principle the x16 boards should work in x1 slots, however you'll have to
> butcher one or the other of the connectors to get them to fit.
>
> In practice I'd be very surprised if this worked the way it was supposed to.

In practice, I can give one datapoint - which is that Intel ships a
motherboard riser with two PCI-E 4x slots with 8x connectors - and that 8x
cards (Mellanox IB adaptors) do work in those 4x slots (I don't recall to
what degree the speed suffered... and I'm no longer working at the job where
I could ask the coworkers involved in testing them.)

--
Nate Edel http://www.cubiclehermit.com/

"I do have a cause, though. It is Obscenity. I'm for it." - Tom Lehrer
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Anonymous
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July 13, 2005 10:10:57 PM

Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

Nate Edel wrote:
> In practice, I can give one datapoint - which is that Intel ships a
> motherboard riser with two PCI-E 4x slots with 8x connectors - and that 8x
> cards (Mellanox IB adaptors) do work in those 4x slots (I don't recall to
> what degree the speed suffered... and I'm no longer working at the job where
> I could ask the coworkers involved in testing them.)
>

Are the x4 & x8 connectors physically the same? I think x8 and x16
usually are, right?

Yousuf Khan
Anonymous
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July 14, 2005 12:20:54 AM

Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

On Wed, 13 Jul 2005 18:10:57 -0400, Yousuf Khan <bbbl67@ezrs.com> wrote:

>Nate Edel wrote:
>> In practice, I can give one datapoint - which is that Intel ships a
>> motherboard riser with two PCI-E 4x slots with 8x connectors - and that 8x
>> cards (Mellanox IB adaptors) do work in those 4x slots (I don't recall to
>> what degree the speed suffered... and I'm no longer working at the job where
>> I could ask the coworkers involved in testing them.)
>>
>
>Are the x4 & x8 connectors physically the same? I think x8 and x16
>usually are, right?
>
> Yousuf Khan

The spec provides for unique x1, x4, x8 and x16 connectors, fwiw.

I suspect designers tend to use x4 connectors for x1 slots, x8 for x4 slots,
and x16 for x8 slots, just to provide greater flexibility (if no higher
performance) wrt add-in cards. Of course, one needs to be aware of what's
legislated in the spec wrt "training down" a link, as there are certain
configurations that are not required to be supported...

/daytripper
Anonymous
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July 14, 2005 3:04:55 AM

Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

daytripper wrote:
> The spec provides for unique x1, x4, x8 and x16 connectors, fwiw.
>
> I suspect designers tend to use x4 connectors for x1 slots, x8 for x4 slots,
> and x16 for x8 slots, just to provide greater flexibility (if no higher
> performance) wrt add-in cards. Of course, one needs to be aware of what's
> legislated in the spec wrt "training down" a link, as there are certain
> configurations that are not required to be supported...

Hmmm.

Yousuf Khan
Anonymous
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July 14, 2005 4:33:36 AM

Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

On Wed, 13 Jul 2005 23:04:55 -0400, Yousuf Khan <bbbl67@ezrs.com> wrote:

>daytripper wrote:
>> The spec provides for unique x1, x4, x8 and x16 connectors, fwiw.
>>
>> I suspect designers tend to use x4 connectors for x1 slots, x8 for x4 slots,
>> and x16 for x8 slots, just to provide greater flexibility (if no higher
>> performance) wrt add-in cards. Of course, one needs to be aware of what's
>> legislated in the spec wrt "training down" a link, as there are certain
>> configurations that are not required to be supported...
>
>Hmmm.
>
> Yousuf Khan

For instance, a pluggable x8 agent is not required to train down to x4, but
must be able to train down to x1. So an x8 agent in an x4 slot using an x8
connector could legally drop right down to x1...
Anonymous
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a b U Graphics card
July 14, 2005 4:52:04 AM

Archived from groups: comp.sys.ibm.pc.hardware.chips (More info?)

daytripper <day_trippr@removeyahoo.com> wrote:
> On Wed, 13 Jul 2005 18:10:57 -0400, Yousuf Khan <bbbl67@ezrs.com> wrote:
> >Nate Edel wrote:
> >> In practice, I can give one datapoint - which is that Intel ships a
> >> motherboard riser with two PCI-E 4x slots with 8x connectors - and that
> >> 8x cards (Mellanox IB adaptors) do work in those 4x slots (I don't
> >
> >Are the x4 & x8 connectors physically the same? I think x8 and x16
> >usually are, right?
>
> The spec provides for unique x1, x4, x8 and x16 connectors, fwiw.

The 4X slots are considerably shorter. Probably half?

> I suspect designers tend to use x4 connectors for x1 slots, x8 for x4
> slots, and x16 for x8 slots, just to provide greater flexibility (if no
> higher performance) wrt add-in cards.

We had two vendors' 2U PCI-E boxes we were evaluating; the stock Intel one
had 2 4x slots with 8x connectors. The other vendor had a regular 4x slot
in the first version of the riser we got, then an actual 8x slot.

--
Nate Edel http://www.cubiclehermit.com/

"I do have a cause, though. It is Obscenity. I'm for it." - Tom Lehrer
!