For gta V theses are the released specs:
Minimum Grand Theft Auto V requirements:
Processor: Intel Core 2 Duo 2.6 Ghz or equivalent
Memory/RAM: 2 GB Ram
Video Card: 512MB NVIDIA 7900 or 512MB ATI X1900
Hard Disk Space: 30 – 40 GB
Operating System: Windows XP SP3 or Windows Vista SP1 or Windows 7 SP1
Recommended system requirements:
CPU: Intel Core 2 Quad 3.66GHz or equivalent AMD
RAM: 4 GB
Video Card (GPU): NVIDIA GTX 480 or similar ATI
Hard Disk Space: 40 GB free HDD
Operating System: Vista SP 2 or Window 7 – 8 SP 1
For watchdogs:
Core i5-670 3.46GHz
Phenom II X4 905e
GD CPU hardware score: 7
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GeForce GTX 650 1GB
Radeon HD 7750 1GB GDDR5
GD GPU hardware score: 7
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6 GB GD RAM hardware score: 8
Win 7 64
DX 11
15 GB
So these are all estimated, but close at that, so for gta v you are in the clear, watchdogs will be a closer cut though as those are minimum requirements. When I was playing Watchdogs at E3 they had some serious hardware to be running it on high.
As for any other games im not too sure on it.