There is no distortion or interpolation, everything is very clear and crisp (as expected).

I did encounter the same problem, fortunately the solution was fairly simple.

I am running Win98 on a Voodoo 5500 PCI equipped PC connected to a Samsung 205B monitor which has a native resolution of 1680x1050 (20").

All it took was to edit the 3dfxvs.inf file included in the installation set by adding the following lines:

--->8---cut--- (under ; Modes)

HKR,"MODES\32\1680,1050"

--->8---cut---

and

--->8---cut--- (somewhere between the other similar lines)

HKR,"TIMINGS\1680,1050\60Hz",,,"GTF"
HKR,"TIMINGS\1680,1050\60Hz",Supported,,"BPP+8+16+32,DDRAW"

--->8---cut---

And then reinstalling the driver.

This worked with
- the last official 3dfx driver
- AmigaMerlin 2.9
- Raziel's Evolution Driver 1.01.16
(all for Win98 of course; no idea if this works with Win2000/XP)

It works and is a serious advantage over running the screen at any other interpolated resolution (the Samsung 205B does not offer a 1:1 mode).

There is however a small disadvantage: video overlays no longer work in the 1680x1050 resolution (every other res is unaffected), all video playback is crude and blocky. I tried three different video players (Classic Media Player, BSPlayer, Windows Media Player), three different V5500 drivers (see above), reinstalled DirectX 9, tried numerous 3dfxvs.inf changes (whatever I thought may help), applied a weird Netmeeting trick (see http://www.sebbi.de/archives/2005/01/07/overlay-directdraw-not-working-easy-fix/) and even more. To no avail.

Dxdiag.exe does not report any problems and all DirectDraw, as well as Direct3D tests run without a glitch.

Does anyone know any possible solution? (Apart from a complete Windows reinstall which probably wouldn't help anyway. It has to do with the resolution and the drivers.)