How to know if video card is Dual DVI

I want to buy a DVI splitter so I can connect 2 of my monitors through one DVI slot on my PC (My video card comes with 2 DVI inputs but I want to connect 3 monitors)
I’ve read up on the DVI splitter for a bit and herd that my video card needs to be able to output a Dual DVI signal in order for the DVI splitters to work…. how would I check if my video card supports this function?
I have a ATI Radeon HD 4800 Series but all it says on the site is that it has Dual DVI inputs and nothing about Dual DVI signals.
Answer #1
check this link
http://en.wikipedia.org/wiki/Digital_Visual_Interface
I think what you need is digital DVI DUAL LINK which most are these days and I would be shocked if a ATI Radeon HD 4800 Series has only DVI SINGLE LINK
think the only way to tell is finding the spec on the exact card (brand & model)
get GPU-Z and post a screen shot
http://www.techpowerup.com/gpuz/
Answer #2
dont you have a “direct port” for multi monitors with ATI?
Answer #3
You don’t say quite what you got, but a HD4850 definitely says dual link DVI..
http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-4000/hd-4850/Pages/ati-radeon-hd-4850-specifications.aspx
This confirms it..
http://www.google.com.au/url?sa=t&rct=j&q=are%20hd%2048xx%20dual%20link%20dvi&source=web&cd=5&ved=0CEgQFjAE&url=http%3A%2F%2Fwww.hisdigital.com%2FUserFiles%2Fproduct%2FATI_Radeon_HD_4800_Series_UG.pdf&ei=jK2_TqvNEMSiiAee7vywBg&usg=AFQjCNELPmq0qrnp678cCv5lpcNxXV3DAQ&cad=rja
If you have a dual link DVI port, then you can use a splitter cable to feed two monitors…Read the reviews for this one..
Remember that both pictures will be a clone of each other..
http://www.amazon.com/Cables-Unlimited-DVI-D-Splitter-PCM-2260/dp/B000H09RFM