Need driver for graphics card: Nvidia Vanta & need to set dpi

[JoeS]

Using Debian Lenny 5.0.2
Nvidia vanta graphics card: need driver, need to set dpi

This is my graphics card:
01:00.0 VGA compatible controller: nVidia Corporation NV6 [Vanta/Vanta LT] (rev 15)

I am using the nv driver at the moment.

I am having trouble setting the dpi on my monitor.
I am trying to set the dpi to 96 x 96
I used the following formula to configure the display size
25.4/96 x resolution

This is part of my xorg.conf:

Section "Monitor"
#DisplaySize 338.67 270.93 # mm (1280 x 1024)
#DisplaySize 338.67 254 # (1280 x 960)
DisplaySize 304.8 228.6 # (1152 x 864)
#DisplaySize 270.93 203.2 # (1024 x 76
Identifier "Monitor0"
VendorName "HSL"
ModelName "76d"
### Comment all HorizSync and VertRefresh values to use DDC:
HorizSync 30.0 - 96.0
VertRefresh 47.0 - 150.0
Option "DPMS"
EndSection

Section "Module"
Load "dbe"
#Load "dri"
Load "record"
Load "xtrap"
Load "glx"
#Load "GLcore"
Load "extmod"
EndSection

when I set the resolution to 1280 x 1024 I get

xdpyinfo | grep resolution
resolution:    90x96 dots per inch

with 1152x864 I get 81x81 dots per inch

with 1024x768 I get 72x72 dots per inch

What am I doing wrong in setting the dpi?
Is nv the best driver for my card, is there other drivers I could try that
would work better?
I don't really need a 3D driver so I didn't want to install the Nvidia
driver if it wasn't necessary.

Thanks.

[Rubberman]

You might want to see if there is a native nVidia driver for this board on the nVidia web site. They usually work better for supporting high-resolution graphics than the default nv or vesa drivers.