6gb of ram but task manager says 4?

Very possible and also maybe a bit of dust got between the contacts then. It's a good idea to have a can of air handy to blow away debris.
 
Corroded connections. Unplugging then plugging them back in was enough friction to bite through.

You think so? Could have been. My mobo is OLD. It's been chugging along for 7 years. I'm really curious to see how long it will be before my 920 starts bottelenecking whatever gpu I have (I upgrade every 2 generations to the second best Nvidia offering).
 
It's what I do too, I buy last year's technology (so to speak) and save money while not really behind in performance.
 
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