I have a nvidia GTX 280 graphics card which has a DVI output.

I know that if I use a DVI cable from it to a Monitor with DVI input I will get ( my desired ) resolution 0f 1920 x 1080 picture.

What i want to do is connect from the same DVI output to a Projector also running at 1920 x 1080. At the same time.

I was thinking that I could have a DVI splitter on the graphics card output, and from that a DVI to DVI cable to the Monitor; and also from the splitter, a DVI to HDMI cable to the projector.

Would that work, i.e. I would have a picture on the monitor and on the projector?
Most of the time I would use one or the other, depending when I'm flying the sim (PJ) or setting things up etc ( monitor )?

Or is my thinking technically wrong somewhere.

Advice would be appreciated - TIA

You do have another HDMI or DVI on the card, don't you? Or are you already using that one?

Because when you select 'clone' for the display type, it is the same as splitting one cable. You'll get the game screen running on both displays, no matter if one is turned on or off.

[EDIT] I have not played with a DVI cable splitter myself, but AFAIK the DVI-out needs to be of the DVI-DL type (Dual Link).

Most likely you will send half-strength signal to each display if you simply split it. Supposing you use a passive splitter and it works, it will be a device like this:

Passive Splitter

But if the image quality suffers because one DVI port from your card can't power two displays, at least the cheap price of the splitter will still make it a worthwhile venture.

Then you will have to fork over a little extra. Here is a powered DVI multiplier:

DVI Multiplier

That's a pricey one, but it gives you an idea of the type of device you might need. I advise you to shop around of course.

The exception to the rule here is when video card manufacturers purposely design a card with only one output port but provide a splitter for dual monitor output. In this case, they output enough power from one port for it to work properly.

By the way, I speak from professional experience. I've spent years installing AV equipment in university classrooms. We always used a VGA multiplier to send signal from one port to the monitor and to a ceiling-mounted projector. When you cut the power to the multiplier (thus making it a passive device) you notice the image dim considerably on both displays.