What's the best video card to use with asus pa27ucx-k 27"?

that is more about what you are doing, 2D / CAD / Games - assuming the card isn't just a total POS - anything will look great on this!

Any possibility of the screen being "Burned in" from any type of use of this monitor?

I doubt under any normal usage that you will experience burn-in. In fact, I really have not heard about that as an issue with this type of monitor.

Can I use it with macbook 16 inch

of course, it takes display port and such... that being said, if you have an Apple, I would probably go with Apples display - while I do LOVE this display, it isn't perfect (although it is close), it blows out colors sometimes when there is a ton of black on the screen and not much else - I can't imagine the Apple does that... but I have 2 of these 32" monsters... once you get one, it is hard to accept anything else - but again, if you have Apple, I would get their monitor (not the stand though for $1k), just get an arm. - hope this helps!

Brand	ASUS
Product Dimensions	76.81 x 47.9 x 35.51 cm; 15.51 kg
Item model number	PA27UCX-K
Manufacturer	ASUS
Series	PA27UCX-K
Color	BLACK
Standing screen display size	27
Screen Resolution	3840x2160
Resolution	3840 x 2160
Processor Count	1
Number of USB 3.0 Ports	4
Number of HDMI Ports	2
Voltage	2.4E+2 Volts
Are Batteries Included	No
Item Weight	15.5 Kilograms

ASUSProArt Display PA27UCX-K 27" 4K HDR Mini LED PC Monitor, 97% DCI-P3 99.5% Adobe RGB 100% sRGB, DeltaE<1, IPS, USB-C HDMI DP, 1000nits, w/X-rite Calibrator, Compatible with Laptop & Mac Monitor

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