I use an ATI 9800pro in winter and an Nvidia FX5200 in summer.
I only run the A.C. at night, and removing the 9800pro is one
less source of heat. In winter, the extra heat is welcome
video card 9800pro fx5200
idle 1.78A 1.37A <--- wall current 120VAC
3dmark2001 2.75A 1.80A <--- wall current 120VAC
3dmark_value 14838marks 5454marks
The warning note in the manual is for some early boards. And,
the thing is, if you contact ATI, they won't agree with Asus's
analysis of the situation. In any case, your card is not one
of the two listed on that page.
You'll notice on that manual page, there is a picture and
a highlight that says "keyed for 1.5V". As long as your
video card has the hole in the right place, it should fit
the board. Judging by these example pages, any video card
made in the last couple of years supports 1.5V, whether it
is Nvidia or ATI. I'm not aware of an Nvidia page similar to
these two (and these pages have been removed from ATI's site -
what possessed them to do that is beyond me).
http://web.archive.org/web/20041014040007/http://mirror.ati.com/support/faq/agpchart.html
http://web.archive.org/web/20041103055247/http://www.ati.com/support/agpchart/agp.html
Another source of info is this page. Go to the table "Practical
Motherboard And Card Compatibility". P4C800-E is fourth row down
"Universal 1.5V AGP 3.0 Motherboard". Only an old 3.3V only card
won't fit. Tables further down the page, allow you to figure out,
based on the chipset on the motherboard, and on the video card,
just what will work.
http://www.playtool.com/pages/agpcompat/agp.html
A good summary page for specs is here. This page allows you
to see the overlap in performance between generations (remembering
of course, that the DirectX feature set is changing along the way,
so later cards are a better match for current game design). It
is interesting to see, for example, how many cards a TI4200 is better
than.
http://www.benchmark.pl/artykuly/zestawienie_GPU_2/skala_wydajnosci.html
These are the last two AGP comparisons on Tomshardware. Some
of the charts are CPU-limited, meaning the fastest cards are
only really needed if you want super-high resolution or AA
turned on.
http://graphics.tomshardware.com/graphic/20050705/index.html
http://graphics.tomshardware.com/graphic/20041004/index.html
HTH,
Paul