Red0y0s :
J-Roc and The Rockpile :
My bad, misread your CPU there....That being said, there is very little difference between the two CPUs, the 70k and the 90k. You should be able to get an overclock of at leas t4.4 to 4.5 ghz if you got a decent chip and are properly cooling it, along with decent airflow through the case, and a motherboard that will actually allow it. More than likely the motherboard cant handle that kind of overclock because it's an miniITX and is probably overheating. A lot of guys run into this issue when they try to budget build a PC and try to OC using a microATX board. A majority of those boards can only handle slight overclocking most of the time.
Number one my list would be to get a better ATX sized motherboard and a decent case with good airflow and plenty of fan mounts.
Buying another 980Ti is a waste of money considering you aren't getting the full performance out of your current one.
Two 980Ti's is even more pointless unless you are planning on running 4K on some ridiculous sized monitor. You aren't unlocking the full potential of your first one, so why get a second? I have a Gigabyte GTX 970 G1 Gaming and I agressively overclocked it. No heating issues there. You just need an aftermarket brand that has a good cooling system (Asus Strix, Gigabyte Windforce, or EVGA...but I'm less familiar with those)
You should be able to max out pretty much any game out there with a single 980 Ti out of the box. Reference design cooling is often awful and by awful I mean extremely sh*tty, hence why your GPU is so loud and throttling back.
You need a better motherboard (and likely a better case to fit that motherboard and one with better airflow and lots of fan mounts) which will allow you to OC much more, and dual channel RAM. Running 980ti's SLI is just a complete waste of money IMO, unless you know exactly what you're doing and why you're doing it. Everyone jumps on the SLI bandwagon because they think more is better. Not always the case. Unless you are doing something much more graphically intensive other than gaming, your GPU is perfectly fine.
You've kinda got a mish-mash of parts that don't make a whole lot of sense to me. Throwing more money at you PC isn't going to necessarily translate into better performance. You should always be buying parts with reasonable justification as to why you are buying them and why that combination makes sense. Unless you are trying to save as much physical space as possible, I am lost with the choice of a minITX.
I don't think you should completely abandon your current system, just the current hardware set-up doesn't make a ton of sense, hence why you are running into performance issues. I can't say I've seen someone with a miniITX and a 980Ti before, unless space saving is really that much of a priority. Those small motherboards usually cant handle OCing and overheat very, very easily.
I'm truly not trying to be a d*ickhead or hate on you...it just kills me when guys spend all their hard earned money on stuff and put it together and it doesn't work out like they had envisioned it to...but that's why you are here, and there's never a stupid question to ask on this forum...so please don't feel offended or judged in any way, that is not my intention with this whatsoever.
I built my PC 2 years ago just for indie development (my main job is software development for a large company) so I didn't want a GPU cos I know what I'm like and I would just play games instead of work. That's why I opted for a small case (bitfenix prodigy) but a few months ago I got the itch and bought a GPU that's why it's a bit weird
I'm sure my H60 isn't performing right cos my CPU temp is about 85 - 90 at load when I overclock it to 4.2, let alone 4.6. Plus as you said, the cooling of this case isn't great for a gaming rig.
I wasn't planning to get another GPU for a while, the i7 was mainly for future proofing when I do get one. But I suppose if I keep most of my stuff it will keep the cost right down for now.
I know the i7 doesn't give you much more for gaming but it helps for SLI right?
So maybe these components then?
Corsair 780T PC Case
ASRock Z97X Killer
Corsair H110i GTX Hydro Cooler
And keep the rest of my components?
Future proofing is never worth it IMO. It's just money thrown out the window...money that could be spent towards meaningful components that will actually have an impact on your performance NOW. In the future "if", and I mean IF, you ever run into the situation where you'd need that component, then buy it then. It'll likely be cheaper too.
Those components are perfectly fine, and quite nice actually. I'd consider buying another stick of 8 GB RAM to
exactly match your your single stick, or just start over and buy a 16 GB kit (2x8) so you'll have dual channel memory. If you buy an additional stick instead of a whole new kit, make sure it is the EXACT same model. Otherwise, good RAM dual 16 GB kit's are only going for $70ish these days, so get that and call it a day. I really wouldn't waste money on higher frequency RAM, as again, it doesn't jack squat for gaming, unless you are running an AMD APU. So find a reasonable 16 GB (2x8 GB) 1600 mhz kit and you are good to go.
All of the experts I've learned from still tell me i7's aren't useful over i5's, even in SLI. There's a few posts about it on here somewhere in the forum, I'll try to find the links.
I'd still stick with you have, and in the future when you absolutely need to spend more money on your rig (I know how it goes!
It get's real addicting real fast)...then you can upgrade, and the components will be a lot cheaper. I'm glad I waited for the price drop on the i5 4690k. Used to be $330, picked one up for $209 not too long ago. I had been running off of an FX-6300 OC'ed at 5.0 ghz and it was still bottlenecking (hate using that term because it gets thrown around far too often without anyone really understanding it) the performance of my GTX 970. Once installed the i5 on a proper Z97 motherboard, the thing was like night and day just STOCK. Then you get into the OCing, and holy crap, you start seeing stars.
What kind of power supply do you have? I'm assuming a fairly beefy one due to the GTX 980Ti?
I should correct myself...the things worth future proofing are: a good case that's the right size to meet your current needs and future desires, and then a good power supply! The worst is having to buy ANOTHER power supply because you skimped out on getting a good one in the first place.
EDIT:
i7's have advantage over i5's in video or graphics rendering...unless you plan to a lot of that, stick with your current CPU.