All modern graphics cards use a pcie x16 graphics card slot.
It has been a very long time since pci graphics has been found on a motherboard.
Graphics cards may use pcie 2 or 3 but are both forward and backward compatible with negligible impact on performance.
Some graphics cards had trouble during the transition between legacy bios and uefi bios motherboards.
I do not know the exact details; I doubt they would apply to you.
One thing you could do is to do a google search for H110M-HDS ASRock and the specific make/model of your GTX1070ti.
Most GTX1070ti cards need a 6 and a 8 pin power connector.
Some highly overclocked versions may need more.
Normally, a 550w psu will be about right.
Some Coolermaster models do not deliver advertised...