[Gllug] AGP 4x

[Jarvis, Richie]

Message: 2
Date: Mon, 08 Oct 2001 19:51:24 +0000
Sorry Mike - got my 1x, 2x and 4x mixed up - the original G400 was labelled
as 1x, 2x and 4x compatible - however when they released it 4x motherboards
were not available.  If you check the matrox forums way back when they came
out, you will see that it can sustain up to 2x AGP bus speeds, but not 4x
(but will work in a mobo supporting the 4x interface if the specs didn't
change in the meantime, which I believe they didn't)  It cannot run at 4x -
ever.

Quote from the MURC forums - Haig, btw works in the Matrox tech support
dept, and made this post back in July 1999

<Quote>
All G400 flavours - OEM, Bulk, Retail, SH, DH, Max all run 2x transactions.
They will also run in 4x mobo but not in 4x transactions, only 2x
transactions.

All I'm saying is that it is not possible for us to claim that our cards
will run 4x transactions when nothing is even specified yet.
</Quote>

Apologies for getting my terminilogy in a twist.

Apologies also for this wonderful Lookout crap that keeps putting HTML mail
at the bottom of my posts even when I have specified plain text mail (how do
i stop this???)

Cheers,

Richie

From: Mike Brodbelt <mike at coruscant.demon.co.uk>
To: gllug at linux.co.uk
Subject: Re: [Gllug] AGP 4x
Reply-To: gllug at linux.co.uk

> "Jarvis, Richie" wrote:
> 
> Simon,
> 
> The G400 does not support AGP 4x - that is the reason why.  It is a 1x
> card - released before the 2x spec came out (hence the 2x compatible -
> i.e. it will work in 2x boards at 1x)

Rubbish:-

(--) MGA(0): Chipset: "mgag400"
(II) MGA(0): Offscreen memory usage will be limited to 512 lines if the
DRI is e
nabled.
(**) MGA(0): Using AGP Mode 2x
(**) MGA(0): Overclocking memory

That's my G400 with XFree 4.0.2.

It's a 4x card - it's limited to 2x by my motherboard.
 
I have:-

       Option     "AGPMode2x"

in the device section of my XF86Config.

Mike.



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