Upgrading my Cybertron PC Borg-Q Gaming Desktop

Thanks for the feedback, so upon doing further research based off your answer I found out that Zbrush runs off RAM mainly. So I think I'm going to proceed with purchasing the 3 additional Memory Modules. I had a question about that though. Currently I'm running a 8gb DDR3 240 pin, and I saw from that link you recommended the G.Skill - Ripjaws V Series 8GB (1 x 8GB) DDR4-2400 Memory (which has I believe 288 pins vs my 240 pin, so it's probably not compatible). I plan on keeping the current memory module in the PC already (There's nothing wrong with it) and buying two additional med to high end 8 gb DDR3 memory modules or maybe switching the DDR3 for DDR4. So I guess my question is, What's the difference between DDR4 and DDR3? Also would there be issues with mixing brands of memory modules in my PC, like purchasing 3 G.Skill Ripjaws X Series 16 GB (2 x 8 GB) 240-Pin DDR3 SDRAM Desktop Memory Modules and placing them in alongside the current memory module? or should I just purchase an additional memory module that's the same as whats in my pc right now and just buy two additional G.Skill Ripjaws X Series 16 GB (2 x 8 GB) 240-Pin DDR3?
This is my top choice right now:
https://www.amazon.com/dp/B00J8E8Y5C/_encoding=UTF8?coliid=I3I9OE97NCYJVM&colid=1OIU9NSEEBE8H


And for the graphics card I read that Adobe CS6 renders smoother on NVIDIA, so I'm going that route I think. Would the 1050gtx be a enough to run battlefield 1 on it's highest setting and most important, is it compatible? (I'm still fairly new to all of this) Also would you be able to provide a link so I know which graphics card your'e referring to? There's so many out there it's hard to understand which one would best suit my graphics needs/ be compatible.
Would this card work with my specs? https://www.amazon.com/dp/B01MF7EQJZ/ref=psdc_284822_t1_B01M64G435

For the PSU I followed that link you sent and entered in my future specs (the outcome was the same for DDR4 and DDR3 with 4x 8gb memory modules) I'll add a screenshot of that so you can see. PSU are fairly cheap so I figured why not go ahead and replace that while I'm at it. Just double checking, the 400W will be more than enough power for what I need right? https://www.amazon.com/EVGA-Warranty-Power-Supply-100-N1-0400-L1/dp/B00LV8TZAG/ref=sr_1_fkmr0_1?ie=UTF8&qid=1500748811&sr=8-1-fkmr0&keywords=evga%2Bn1%2B80%2B%2B400w&th=1


spec image link for power source: https://drive.google.com/open?id=0B05FOlfCuxF-NlRiV3VmMWRLOTA

Thanks again!