Question about NZXT H510 Elite

Hoi Thawuwi
From the pictures I found on the internet of your Acer Predator Orion 3000, the motherboard does not seem to be a standard format. It seems to be too wide, but I can't tell you if the H510 happens to have the correct mounting points.
You would have to buy a compatible motherboard for your processor and memory. Unfortunately, I can't tell you which mainboard will fit and whether the power supply has the correct connections for a standard mainboard.