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I tried running vr on a gtx 780 for fun, it was frames. It couldn't handle vr well at all.
I'd say minimum for running ok vr is gtx 960.
But alyx requires gtx 1060, don't skimp out on video card, alyx just from screen shots, looks like it needs a good video card.
The processing on the card isn't good enough to render the frames quickly enough, and it only has 4GB of memory. There is a reason Valve have specified a 6GB card as the minimum :- it needs that memory. If you don't have it, the graphics card has to constantly shunt memory to and from your system memory, access to which is many times slower than onboard memory. You'll be in low single digit frame rates, if that. - we saw that with Boneworks - 1060 6GB (or equivalent) required, 1060 3GB cards were getting about 6-7 fps.
Slide-shows are not good in VR.
Just checked, and your card isn't recommended by https://www.techpowerup.com/gpu-specs/geforce-gtx-745-oem.c2561 for even gaming at 1920x1080. All the headsets have two displays that are both higher resolution than that... go figure.