This is my dream mini-itx build. I became almost obsessed with the idea of having a high-end enthusiast grade pc crammed into such a tiny form factor... So much so that I sold my old mid tower system and started from scratch on this new machine.
So far all I've really only gamed on it. It's really not meant to be anything else. I've hosted a few game servers off of the 1230 v3 and it's held up very well.
The only planned upgrades are for the ram (upgrading to 2x8gb 1866mhz) at some point when ram becomes an actual issue. I find that 8gb is just fine for gaming.
The only real issue I've had with this build was with PSUs. I've been through 2 of them because of coil whine. Actually found out that coil whine goes away after a few weeks or months of running the new parts... I wish I would have read about that before wasting around 30 dollars on shipping.
One minor issue that you have to keep in mind with these compact builds is heat. I was reaching 70c on the hottest core of the 1230 v3 with the stock cooler. I eventually opted for the h80i water cooler since it's about as good as it gets for cooling that fits in this case. I worried about clearance issues with how thick the radiator is but I had no issues. If you look at my pictures you can see that I was even able to fit my SSD between the radiator fan and the motherboard.
All in all I'm pretty happy with this build. I mean it runs cooler than my mid tower build did thanks too the h80i. It's around triple the performance at 1/3 the size. Don't let the high price tag scare you. You will definitely get your moneys worth out of this machine if you like cranking games to max and watching them run silky smooth at 60+ fps. The 780 is one of the best priced single card solutions out there. If your on the ropes between either the 780 or 780ti I'd say take a look at the rest of your build. If your sacrificing anything to get the extra $200 for the 780 ti I'd say step up those components before going for the 780 ti.
Final notes -
SSD: The Samsung Evo is one of the best selling/rated SSDs on the market totally worth buying.
CPU: The Xeon E3-1230 V3 is basically an i7 4770 without the internal graphics. Runs cooler & with less power draw.
Cooler: The h80i is the best water cooler at this time that fits in this case at $55 refurbished this was a steal.
MOBO: GA-H87N-NONWIFI... Pci 3.0, Usb 3 that's really all I cared about. Gigabyte is a reputable company.
RAM: Crucial Ballistix Sport... Runs cool low profile cheap memory. Perfect for a mini-itx build.
PSU: SeaSonic 650w Gold Cert Mod... Don't cheap out on a PSU. SeaSonic is a very reputable company.
HDD: WD Blue 1tb... Cheapest 1tb drive. Also one of the best rated.
Case: CM Elite 130... No complaints. This case fit all my hardware and then some... Psu juts out of the case but w/e.
GPU: 780 SC... Amazing performance. It will blow you away. I recommend the EVGA ACX SC over this model for temps.