ChrisvC

Could be that driver issue i have seem other people have talked about here https://www.techradar.com/news/new-windows-10-driver-problem-could-be-the-most-serious-yet-heres-how-to-fix-it.

Thank you! I'll look into it

maybe new CPU and mobo (and RAM, if you go skylake)? just to keep up with the current generation and some extra performance

It's just that having 2 doubles the chance of a failure and SSDs area already less reliable than HDDs.
I was saying that a bit tongue in cheek though, it's not really too dangerous but I'd feel safer either in RAID 1 or with a single drive.

i7 6700, but it might be quite expensive. Mobo is your choice, based on stuff you need, and RAM will be DDR4 this time
 
I can't tell you exactly which CPU will be better than yours and the performance gain with it, so maybe wait for other answers

The PSU is what I'd consider mediocre quality. It's unlike the CX500 and CX600 which are rated for 30C [EDIT: I'm wrong here, the CX750 utilises DC-DC for the minor rails so the voltage stability is better. It's still rated for 30C]. The component selection tends to be so-so quality but nothing particularly terrible either. As the long as the PSU is kept cool, there shouldn't be a problem.
 
Of course, a PSU upgrade would be a good idea but it's not necessary.

the e5 2670 is usually avaliable for around $100 or so at ebay used, great cpu with 8 cores HT. just make sure the psu you're upgrading to can support the 2 gtx 980ti before you get it(a good 750w will do).

replace the CX750(if its a green unit) with a better unit(EVGA supernova non-NEX,any seasonic/XFX(non-XT)), get an e5 2670 if you're gonna do any video editing or rendering in the future, and get a gtx 1080/2nd gtx 980ti for better fps. also, maybe replace it with a 144hz/1440p monitor.

Honestly that i7 3820 and psu are the only things I would change if i were to change anything (priority being PSU.) Add another GTX 980ti in SLI... Should be even with 1080 and in some cases outperform it.

If you got for a second 980ti then most definitely get a better PSU. It's probably fine for now but when you put two hot cards in a system together it would be wise to get a PSU that can handle it better. An 850W EVGA GS/G2, XFX something of around that wattage, Antec HCP, Cooler Master V-series, Corsair RMi, etc, would do you nicely.

Thank you! I'll look into it

Thanks for the advice!

Thanks for the advice!