I am asking for help looking for a couple of games that will really test my new machine, preferably available here on GOG.

A while back my processor died on my old gaming machine so I spent some time, saved up and now am about to put together my new machine, whilst replacing the old processor and giving the old machine to a family member as their first gaming PC.

The new machine has
AMD CPU AMD FX-8350 4 GHz
Geforce GTX 1060 3GB
8GB HyperX RAM
with a few other bits.

I already own:
Witcher 3 GotY,
Saints Row 2 -> GooH,
Hand of Fate,
ArcaniA + Gothic,
Divinity Original Sin 1 + 2,
and Crysis

and some other games, so I hope to be able to put the new machine through its paces.

Yet I would like to know if any one can point out any other games here that would test my machine, or do I have some of the biggest resource users here?

Some of the games I do not own, but I was looking at are:
Ashes of the Singularity (as it came redeemable with the CPU, Steam key I think though)
The Saboteur,
Mirrors Edge,
and Dying Light.

Thank-you in advance for any other games to look at. :)

edit: fixed stupid spelling mistakes.

Stalker Shadow of Chernobyl
Stalker clear sky
Stalker call of pripyat
Metro 2033
Metro last light
Witcher 2
KONA
shadwen
bombshell
Quern
Man o War
Ashes of singularity
Outlast 2
obduction
Shadow warrior 2
Through the woods

All on GOG and great games well at least 80% of them. but these will put your system through the ringer in terms of requirements and system resource hog.

Carmageddon DOSBox 3Dfx ;)

Nothing else to add, other than search by most recent titles for the most hardware-intensive? https://www.gog.com/games?release=a2015&sort=bestselling&page=1

There aren't that many titles on GOG that really tax your hardware. That's because GOG doesn't have a lot of 0-day AAA games. Old hardware-hogs like Crysis can run on any mid- to lowrange computer nowadays and turn based games like Original Sin usually aren't very hardware intensive.

If you really want to stress your computer the best games on GOG would be The Witcher 3, Dying Light and Shadow Warrior 2.

Arma 2 if you got it while it was still available here, X3 Terran Conflict is another one that you could run. Both these games are CPU heavy.