Shouldn't be a big problem to do some basic upgrades. The 790's are good little work horses but you'll need to make a few changes.
RAM: It uses DDR3 1333Mhz. It has a max capacity of 16GB. Should be pretty simple to max out your capacity. Now you can try and find matching RAM with what you already have in the system but chances are it'll be more expensive than just getting a new kit. Something like this will do you just fine.
8GB kit
https://pcpartpicker.com/product/36zv6h/gskill-memory-f312800cl9d8gbrl
16GB kit
https://pcpartpicker.com/product/WHMFf7/gskill-memory-f310666cl9q16gbxl
PSU: You'll need a new one if you're going to get a good video card. That motherboard thankfully doesn't use proprietary connectors, so you can use a standard ATX PSU. Depending on the video card you get, you'll need anywhere from a 400w to a 550w. I'd recommend a 550 or 650w PSU so if you end up building a system after this you can feasibly expect to reuse the PSU. Also much more than 600-650w and you'll start getting physically larger units which will be hard to fit in your case. If you have the cash for it, I'd recommend a modular or semi modular PSU so you're not dealing with a rats nest of cabling. You can find cheaper than the ones I listed, but the $20 difference between the cheapest and my recommendation probably isn't worth the difference in build quality.
550w Non Modular
https://pcpartpicker.com/product/2tckcf/xfx-power-supply-xfxts550w
650w Semi Modular
https://pcpartpicker.com/product/kz7CmG/evga-power-supply-210gq0650
550w Full modular
https://pcpartpicker.com/product/qYTrxr/evga-power-supply-220g20550y1
If these models aren't available in your area, here is a good link for looking at different tiers of models.
http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html
Lastly, the video card. You're going to need to measure the space for the card to make sure it'll fit. The hard drive cages in the case will block off a card larger than the width of the motherboard. You'll probably want to stick to reference design sizes at the largest.
As for the card itself, I'd really recommend going with a 1060 instead of a 980. The 1060 performs about on par with the 980 and is about $200 less.
Size wise, this two should fit (tho make sure to measure before buying a new card)
https://pcpartpicker.com/product/Ft7CmG/zotac-geforce-gtx-1060-6gb-mini-video-card-zt-p10600a-10l
Step up from that size wise
https://pcpartpicker.com/product/pbL7YJ/evga-geforce-gtx-1060-6gb-gaming-video-card-06g-p4-6161-kr
I wouldn't recommend upgrading your motherboard. If you do that you'll likely need to upgrade everything; CPU, Case, RAM, etc. The PSU and GPU are good to use in the system you have now, and both can be carried over to a new build later on if you decide to do a major upgrade.
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