QUOTE(wongkoewei @ Jan 28 2015, 12:24 PM)
I guess I should put my money for upgrade my PSU to platinum class? If you ask me, I don't think this is entirely gimmickry as the trending nowm the game are using more and more VRAM and engineers from some company seems lazy to optimize their game (namely ubisoft). For example, apart 2GB VRAM as being 'premium' few years ago, but 2GB now are actually minimum requirement. and much of the game requires more than 3GB VRAM to run on ultra setting.
from what i have observe from Watch dog gaming, one time i deliberately maxed all the setting and see the effect on my HD7870 2GB card. VRAM usage are reaching 2.0GB, mean almost full utilization but GPU never use over 40% mainly hovering from 28-35%. So i don't think AMD GPU are even bottlenecked yet, but the VRAM is the culprit. (observe through Microsoft process explorer.
Based on what you said, I think 290x 8GB will be able to last very long.
The reason people upgrading most probably due to RAM issue.
Let's say
HD7870 2GB only use 40% but 2GB RAM.
But if HD7870 have 4GB, you might not even need to upgrade now.
So let's say 290X 4GB. Probably some stuttering in newer games because low VRAM.
With 290X 8GB no more stuttering.
________________________________________________-
In another word:-
290X 4GB
390X 4GB
Running game XXX that need 6GB VRAM.
390X 4GB - 60fps
290X 4GB - 10fps
Reason:- 390X is faster to process so with same RAM, it can generate faster image to keep dumping out and no need to store so long in VRAM.
But 290X is slower than 390X. So it work slowing to store into ram and dump to HDMI.
But...if we use
290X 8GB - 35fps
Why I predict 35fps? Because it has more RAM to store and put out to HDMI.
We all know that once VRAM got full, your FPS will tanked.
____________________________________________________
Summary:-
R9 290X 8GB will be future proof.