On Sun, 14 Oct 2001, Keith Whitwell wrote:
> On Sun, 14 Oct 2001 12:59, [EMAIL PROTECTED] wrote:
> > On Sun, 14 Oct 2001, Keith Whitwell wrote:
> > > > Are you sure ? I am asking because there are newer cards with 64megs of
> > > > RAM and they way AGP was marketed is to allow to extend the amount of
> > > > offscreen memory..
> > >
> > > The agp aperture is implemented on the motherboard, nothing to do with
> > > which video card you plug in. Some newer chipsets apparently can do an
> > > agp apeture
> >
> > What I meant is that if the card has 64 megs on it and the aperture is
> > only 64 megs then chopping off 1-2 megs of aperture space is somewhat
> > expensive - isn't it ?
>
> Why? I don't understand what you mean.
Well, if we have an 8mg AGP card we'll have 8:64 - 1:8 video/ram texture
ratio. If we change this to 8:62 it will 1:7.75 - not very
noticable. Also, at 1:8 ratio it is likely you'll run into bandwidth
problems before you utilize all 64mb of AGP aperture.
However if you have 64mb AGP card (which is likely 4x) you'll have 64:64,
1:1 that will change to 1:0.96 - still not much, but that extra 2 meg will
be more expensive.
Real numbers, however are different:
(II) RADEON(0): [agp] Mode 0x1f000201 [AGP 0x8086/0x7190; Card
0x1002/0x5144]
(II) RADEON(0): [agp] 8192 kB allocated with handle 0xe2a1c000
(II) RADEON(0): [agp] ring handle = 0xe0000000
(II) RADEON(0): [agp] Ring mapped at 0x422ce000
(II) RADEON(0): [agp] ring read ptr handle = 0xe0101000
(II) RADEON(0): [agp] Ring read ptr mapped at 0x40018000
(II) RADEON(0): [agp] vertex/indirect buffers handle = 0xe0102000
(II) RADEON(0): [agp] Vertex/indirect buffers mapped at 0x423cf000
(II) RADEON(0): [agp] Capture buffers handle = 0xe0302000
(II) RADEON(0): [agp] Capture buffers mapped at 0x425cf000
(II) RADEON(0): [agp] AGP texture map handle = 0xe0502000
(II) RADEON(0): [agp] AGP Texture map mapped at 0x427cf000
(II) RADEON(0): [drm] register handle = 0xe5000000
(II) RADEON(0): [dri] Visual configs initialized
(II) RADEON(0): CP in BM mode
(II) RADEON(0): Using 8 MB AGP aperture
(II) RADEON(0): Using 1 MB for the ring buffer
The 1 meg capture buffer is expensive.. 2megs - even more so.
Vladimir Dergachev
>
> Keith
>
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