always compatible. DVI-I is compatible, DVI-D is not. -- Hennes Aug 30 at 14:35 feedback 5 Answers Best and most reliable option is to buy a new graphics card if you have a spare slot. Graphics over USB is woeful. Watching content that refreshes quickly (ie, Video) is not worth it. The cheaper end of graphics cards however are generally quite acceptable. Choose one that supports DVI-I, then you can use a DVI/VGA adaptor for your VGA monitor, later being able to use it for DVI if needed. A Y-Split will not extend, only duplicate the signal (unless you have a dual DVI port) however I doubt this. Thanks! In case I understand wrongly, I could simply buy a cheap VGA PCI graphics card to put into my computer and have the DVI monitor plugged into the original graphics card and the VGA monitor plugged into the cheap graphics card, am I right? -- xEnOn Aug 30 at 5:24 Yep, you certainly can do that :) I simply suggested buying one with a DVI output, and then using a DVI/VGA adaptor in case you wanted to use it in the future with your current or another DVI only monitor. -- Trissy Aug 30 at 5:24 I just opened up my computer and realised that it has only one graphics card slot. The other available slots are all PCI. I have 2 old graphic cards but they are all uses AGP. Not sure if this getting a PCI graphics card with