Game is fine.
Some things still to tweak and tune; but this isnt an indication of any failing on WHs part.
Like a few other open world games KCD is bound to draw heavily from the CPU/RAM/Storage/GPU in ways many other games will never strive to achieve.
I would recommend at least 8Gb of RAM (if using only 8Gb best have a very clean windows install with no ancillory software, and a fast drive to stream from…),… ideally a six core processor with hyper threading, although high clocked i7s should prove capable…
Optimally set up drive configuration (eg paging file on a different drive to the game etc/not an SSD that requires heavy CPU to work (eg mainstream cheapies).
And a decent video card (something that was a mid level variant when it came out…).
That would be the lowest to 'sneak over the line and possibly get console plus experience…
Otherwise- 16gb RAM (tweaked cr1 and lower cl or much faster speed eg 2666)
Intel 5920k / AMD equivalent as CPU
Nvidia 980 (780 970) / AMD fury (380 470)
Will hit many Ultra settings and prove a nice game experience…
I have a system like suggested with a ‘cheap’ second hand video card: a 4Gb amd fury…
I get ultra plus settings at high frame rate.
Game has no bottlenecks…
Unlike the OPs video card which greatly holds back the rig.
An nvidia 630 is below the min/rec spec for just about every recent game on steam- and certainly below what is needed for smooth gaming in one of the trickier genres to do (large scale open world).
Given a video card with twice as much grunt are genetally past flooding the second hand market and are so cheap that they would cost way less than the game: it probably isnt worth our time to discuss this- one-two hours of wage could make the game very smooth for the OP!
An nvidia 630 is less than half the grunt of an xbox/ps4. Nuff said!