I like to buy equipment (when I can afford it) because the less I have to rely on equipment that I haven't used before (i.e. that I don't own), the more peace of mind I have. Example: If I build a show that uses a MIDI-USB interface, I'll buy one so that I have it for the tour and for future projects. Plus it lets me experiment on my own with test-builds, rent it out to other designer friends when I'm not using it, and often times having certain bits of tech in my "just-in case" kit has saved the day for more casual/low-stakes projects, pieces, installations, and VJ setups (both mine and others) where everything hasn't necessarily been thought out meticulously ahead of time because ideas are still evolving in an organic way on site. It also has helped me in cases where there's been dud rental equipment or other equipment failure and new equipment is needed too last-minute for rental (or even purchase) to be an option. (Also I'm secretly a dragon but my hoard is equipment, not gold.)
The issue was that matrox had not give me any 3x(something) option at the beginning.
First I found out that my only HDMI port is connected to my motherboard, not my graphics card (it's a laptop). After that, I managed to create a new custom resolution, 2400x480, the only one that worked, which was a partial solution due to very low resolution. So I ended up with three projectors with 800x480 each.
What I learned so far is that my laptop is not suitable for matrox.
No problem. About four years ago I spent three days going absolutely mad trying to figure this exact issue out. The forum pointed me in the right direction and now I include this step in all the shows I make.