Agera One :
Okay. Now, there are websites that say a GPU gives "xx" frame rates in a particular game at various resolution and detail settings. So, my question is; is there any website that shows this game uses this much amount of RAM for this setting (with some test CPU and GPU) and this game uses this much % of CPU & GPU consumption at various settings?
May I ask why the concern about RAM? CPU usage has been shown in gaming since BF4 was released, because the 2013 -> forward games are doing more then 'graphics', such as the physics of destructible content ( how does a rebar-concrete wall react to your knife as compared to a wood one), much smarter AIs (example COD:Ghosts Squad playing against BOTs), and so on which are all CPU based. With any of the games you can look up GAMENAME + CPU Benchmarks, and see what each chipset does.
From my own research the 'current' games (AC:Unity, COD:Ghosts, BF4, WatchDogs, etc.) shows to meet the 'consumer demanded I seen that on youtube type game play', which is 1080P High Graphics 50FPS or better, it is FX-8xxx, i5 Haswell, then i7 Haswell as the in order options. Nothing else can really keep up with the equally matched cards (NVidia 770/780 or AMD R9 280) that can produce the graphics at this level. For example I wouldn't try to PAIR a i5Haswell with a Titan card, it make more sense with a i7, if I have enough to spend on a Titan, and to 'keep up' with the Titan.
Now RAM wise, systems NORMALLY sell with 8GB, because this is the sweet spot with all the 'multitasking' you do, even when gaming. For example, you open Chrome, got 15 tabs open on the game you tend to play, to see how best to play, tips and tricks, fixes and bugs, etc. Add to those tabs (never mind any extensions in Chrome you installed which also is more CPU and RAM), the Antivirus running, the addon Gaming software (Mouse control, Sound Panel, etc.), or the persistent GPU software that will 'switch' to the optimized performance for the game when it is launched. Add in a streaming music in the background, or your IM client / EMail Checker, etc. all eat away BEFORE you even CLICK the game to launch.
So to optimally function RAM wise, the rule of thumb I most time heard (especially with games like Watchdogs, etc.) is you should have 4GB minimal FREE (outside of all that I just listed) of RAM + 1-2GB over that as when you near the max of RAM Windows automatically switches to Swap Drive to prevent system lockup/crash due to lack of RAM (it still has to swap things in and out). Personally as I have many things happening 16GB is best for me.
I have Outlook open, listening to a stream, running the normal sys tray apps, Rainmeter to keep an eye on my system specs, RocketDocket to launch from, Skype to chat with, and only 20 tabs open in Chrome, and I am using 6.5GB RAM.