p4p800 deluxe AGP conflicting info?

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lucky

I have a AIW Radeon and per this chart
http://www.ati.com/support/faq/agpchart.html
have a universal 2x/4x card that supports 3.3 and 1.5.

Now I get to the Asus site and it appears 4x is not mentioned but the
1.5 is. I'm assuming nothing to worry about but want to make sure that
the volts is more important than a 4x or 8x rating.


http://usa.asus.com/prog/spec.asp?m=P4P800 Deluxe&langs=09 states
1 x AGP 8X/4X (0.8V, 1.5V only)

the owner's manual
http://www.asus.com/pub/ASUS/mb/sock478/p4p800/e1323_p4p800_deluxe.pdf
states
1xAGP 8x(1.5v only)
 
lucky said:
I have a AIW Radeon and per this chart
http://www.ati.com/support/faq/agpchart.html
have a universal 2x/4x card that supports 3.3 and 1.5.

Now I get to the Asus site and it appears 4x is not mentioned but the
1.5 is. I'm assuming nothing to worry about but want to make sure that
the volts is more important than a 4x or 8x rating.


http://usa.asus.com/prog/spec.asp?m=P4P800 Deluxe&langs=09 states
1 x AGP 8X/4X (0.8V, 1.5V only)

the owner's manual
http://www.asus.com/pub/ASUS/mb/sock478/p4p800/e1323_p4p800_deluxe.pdf
states
1xAGP 8x(1.5v only)
Click to expand...

when I originally set my P4P800Dlx up 6 weeks or so ago, it was with an old
ATI 8500LE card I bought about 15 or 18 months ago from Crucial. The card
was rated as 2x/4x (and maybe 1x also, not sure). It ran fine in the AGP
slot of this mobo.

Only problem I had was that I wanted to run a dual monitor setup, so I
bought a discontinued ATI 9100 PCI card to drive the second monitor.
Software and/or resource conflicts prevented this second ATI card from
peacefully co-existing with the AGP ATI card, so in the end I RMA'd it back
to the seller.

Getting back to your AIW card that is 2x/4x, it should work ok in the AGP
slot of a P4P800D.

Good luck,

ken
 
lucky said:
I have a AIW Radeon and per this chart
http://www.ati.com/support/faq/agpchart.html
have a universal 2x/4x card that supports 3.3 and 1.5.

Now I get to the Asus site and it appears 4x is not mentioned but the
1.5 is. I'm assuming nothing to worry about but want to make sure that
the volts is more important than a 4x or 8x rating.


http://usa.asus.com/prog/spec.asp?m=P4P800 Deluxe&langs=09 states
1 x AGP 8X/4X (0.8V, 1.5V only)

the owner's manual
http://www.asus.com/pub/ASUS/mb/sock478/p4p800/e1323_p4p800_deluxe.pdf
states
1xAGP 8x(1.5v only)
Click to expand...

Any time I try to answer an AGP question, it only seems to make
things worse, but here goes anyway :-)

The Northbridge is 865PE. This is the specification.

http://www.intel.com/design/chipsets/datashts/25252301.pdf

On page 132 is a table of AGP info.

As far as I know, when they say 0.8V or 1.5V, at least with current
technology these are both actually running at 1.5V I/O supply voltage.
The 0.8V refers to the signal swing. When an AGP8X card is plugged in,
it has termination resistors on it. There is a voltage divider action
between the Northbridge AGP driver and the termination resistor, which
causes a half amplitude swing of the AGP signals. A AGP4X card has no
termination resistors, so the Northbridge AGP driver makes a full 1.5V
swing due to the lack of a load on the end of the transmission line.

| AGP card
| |\
+1.5 -----/\/\/\----------+--------| \---
Northbridge | | 0.8V |/
Driver | \
Impedance | / AGP 8X
\ Parallel Termination resistor
/
|
GND

| AGP card
| |\
+1.5 -----/\/\/\-------------------| \---
Northbridge | 1.5V |/
Driver |
Impedance | AGP 4X
Series Damped

I base these pictures on the information on page 132, where it refers
to parallel terminated and serial terminated for the two cases.
In both cases above, the chips at either end of the link are _powered_
by 1.5V.

As long as your video card has the 1.5V slot cut in the edge
card connector, as shown in the manual, it should plug in and work
at the 4X rate. Note that the pg.132 table says operating at the 2X
rate isn't supported.

HTH,
Paul
 
Paul and Ken thanks for the info. I'm on the upper end of confidence
this board will work with my agp card should I decide on it. The deluxe
seems to have the flexibility with not spending so much now but room to
expand later on. I'm keeping everything stock, I'm very happy with how
it will come out of the box. Anything's better than the dinosaur I have
now. p3bf.
 
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