Ive just upgraded my TV to a sony KDL40w4000
Unfortunately this means that the picture from my KM box is woeful on it.
I had been using it at 1024x768 via vga on my previous (much smaller) set but on the larger screen this looks awful.

Can anyone suggest what graphics card i need to get to get this working at acceptable resolution ?

EDIT: Should have added this is for watching Freeview transmissions in UK (SD)

It should be possible to output a much better pic from the mythbox as the freeview picture from the inbuilt tv tuner is excellent as is that from a BTVision box.

If you just want to send video, all you need is a card that has a DVI output, and a DVI to HDMI cable: the video signal is effectively the same over DVI and HDMI.

If you want to merge video and digital audio, there's an adapter that will take DVI and optical in, and provide an HDMI out

http://www.monoprice.com/products/produ ... 1&format=2

I had some problems with this, though, running through a AV receiver.

Thanks
My TV has resolution 1920 x 1080

are there any graphics cards that run at that resolution and are supported by linux/mythtv ?

Will running at higher res have any significant impact on cpu (my mythboxes only have 1.4 althon and 1.7ghz pentium cpus)

I have found the stretch modes on the Sony are excellent, but the stretch modes on mythtv are horrible.

Mythtv displaying at 4:3 is of similar quality as the internal tuner of the sony with a display set to 4:3. However, that wastes a lot of screen.

Unfortunately, the Sony stretch modes do not work on the VGA input. I've been tempted to get a card with DVI/HDMI outputs, but don't know if the Sony stretch modes work on them. Has anyone tried this?

Note that 16:9 DVDs display nicely. You might try a 16:9 (letterbox) DVD to see how it looks. If it is also horrible, you might have another problem (ex. poor quality or broken video card).

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ASUS AT3N7A-I (Atom 330)
TBS 8922 PCI (DVB-S2)

Any decent modern video card (say the better FX5200 based Nvidia cards on up) will do the 1080i, but your CPUs may be another story. You almost certainly don't have enough horsepower there to decode HD content even with XvMC support.

I just purchased a new TV myself. My Westy 37" 720p set died after 18 months (can't get parts to fix, too expensive to fix if parts were available). Warranty via credit card will replace the set (haven't gotten check yet).
I replaced it with a Samsung LN40A530 (40" 1080p LCD).

I am using an AMD 64 3200+ with an NVidia 6200 TC. I was previously using VGA on the Westy, but now I've got the Samsung connected via DVI->HDMI. I had to make only a couple of minor tweeks to get my box to output a 1080p signal and playback full screen.

At first, the Samsung was reporting that I was feeding it a 720p signal (1360x768 I think). My first change was using nvidia-settings. A simple auto detect and apply of the settings resulting in a 1920x1080 output.

But my HD playback was displayed in a 1920x720 window of my TV (stretched horizontally, but not filled vertically). To fix this I had to edit my xorg.conf file to add a 1920x1080 mode.

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ZOTAC ZBOX HD-ID34
HDHomerun
Streamzap IR remote
2GB RAM