Have you had a chance to test if the MSI GTX750Ti's fan can drop lower than 30%?
Quick answer no, long answer check post on GTX 750Ti sips power thread
, on page 4 scroll down, you find some graphs and readings about the card, the twin frozr fans and using a pwm fan on it.
From what I can tell from THIS SCREENSHOT
your GTX780 is not limited to min. 30% - correct?
Do you know what the minimum limit is for your GTX780?
Well the screenshot you are seeing is to show how the Accelero III coudlnt be read accurately via the 4pin GPU pwm header on the video card and the Accelero IV fix this, its more a comparation to show how both were really different in their PWM design. Now the limit is 26% pwm from what i recall, this is in theory.... pwm design of the gpus are not as transparent as motherboards, specially nvidia implementation... but you wont be able to go below 26%, its restricted by the vbios, unless you want to flash mod it, that i personally dont recommend, there are much better options now, like GTX970/980 STRIX or Twin Frozr V, both offer passive idle performance and still very quiet above 67C. No reason to look into GTX780 anymore or in aftermarket cooling solutions.
Why did you choose the 4790K over the 4690K for your gaming rig?
I do some encoding and editing on my gaming pc that do take the advantage on the hyperthreading, and i wanted 4.4Ghgz stock =), that i finally didnt go for due to temps (pending if the FT05 can help me with that), but stayed on 4.2ghz. The i5 4690K is a much better choice for pure gaming, specially since it runs at least 10C cooler under the same load, so you will end up with quieter setup or cooler running, also consumes less power, much cheaper, so for pure gaming build go for the i5 4690K
Do you play games that can take advantage of hypertreading?
Not atm, but i seen people mention games like BF4 do, weather its a significant upgrade, i doubt it, but reality is that most games are optimized for one or two cores, we are barely starting to see the trend of moving toward 4 cores.... so for now i5 for gaming is ideal.
But i do expect that with the release of the new consoles using multicores, more and more new releases will start to be design for 4 or more cores, this comes at the time that really doesnt matter much though, as those cpus still are very light compared to a high end intel cpu, and by the time we need more cores, there will be better chips and platfroms from intel, its best to just plan for the short term and invest the least that you can to cover what you really need, future proofing on PCs is really a bad investment.