AGP bandwidth question

Hi,

I'm trying to find out about AGPx8 read and
write performance. The "x8" means that write
operations are 8 times faster than for AGPx1,
correct? What about read operations? Are they
always the same for AGPx2, AGPx4 and AGPx8?
Is AGP a one way street?

Any good link on the topic?

Thanks you,

Toni


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On Tue, 24 Aug 2004 18:23:04 +0200, Antonio Bleile
wrote:

I'm trying to find out about AGPx8 read and
write performance. The "x8" means that write
operations are 8 times faster than for AGPx1,
correct?

data transfer between different modes is ment IMHO in read mode
from chipset to video card & rappresent only theorethical max
bandwith, which is very very very rarely used (practically never,
bandwith gets never satureted, mostly marketing!)
there is practicaly no difference /real life, not benchmarks/ between
speed of Agp2x and more /after 2x to 4x or to 8x there is only few %
of improvement in benchmarks/.

Speed of Agp transfer has nothing to do with slot/connecting standards
directly; but different AGP X.x standards define different Agp voltage
signaling to, so be carefuly which AGP slot of MoBo or Video card
supports (check manuals!)

What about read operations? Are they
always the same for AGPx2, AGPx4 and AGPx8?
Is AGP a one way street?

IMHO is 2Way street, but sending data from video card to the rest of
machine is way slower (write) than read in oposite way.
(example: similar behavior like ADSL modems, upload is way slower than
download) ...
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