OAcesync

Just lower some settings I wouldn't buy a new GPU until you feel unsatisfied with FPS performance

neither
xeon e3 1231v3 if you can is better

Sag is rarely something to be CONCERNED about, it's purely personal standards / limits of what is acceptable.

true you wouldn't tell much difference 1440p 

Dota is probably most toxic, Undertale or FNaF is most cancer, what community is better?
Console. PC is fucking toxic. Accept the truth.
Console just has a retarded, for lack of a better word, community. PC has a very unfriendly community.

You can probably get a refund but a 4690k should be fine for streaming.
What are you using to stream?

Any X99 MOBO can do that.

6 cores doesn't mean it'll be better for gaming. The i5 is better in single-threaded performance and gaming. The 3.5Ghz is irrelevant; the i5 will still beat the AMD CPU.

NO. Intel is better for a CPU. Just get an AMD GPU if you're so deadset on having AMD in your build.

external one? And why AMD if Intel is superior and within budget

Please don't.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor  ($164.99 @ SuperBiiz)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard  ($45.98 @ OutletPC)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR3-1600 Memory  ($39.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive  ($49.98 @ OutletPC)
Video Card: MSI Radeon R9 380 4GB Video Card  ($219.99 @ Micro Center)
Case: Corsair 100R ATX Mid Tower Case  ($37.99 @ Micro Center)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply  ($55.99 @ SuperBiiz)
Total: $614.91
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-12-26 23:32 EST-0500

Streaming console games is fine on the CPU
To lower CPU usage for PC games a capture card would help

if its overclocked, turn the overclocks off
else RMA 

Watch out for "hd monitor" that is 1600x900.....

Don't spend too much on motherboards.
 
Concentrate on selecting main components, such as CPU, GPU, Storage and RAM.
 
Get the cheapest motherboards which suits your needs like theme, SLI/CF compatibility, M.2 slot if you want.

RM - overpriced with crappy secondary caps
RMx - decent value with full japanese caps
RMi - costs more than RMx and features Corsair Link

80+ certification doesn't necessary dictates whether or not you have have a reliable power supply or not. For the end user, all you really need to know by getting is that:
1) your computer will draw the same amount of power from the PSU whether it is a Bronze or Titanium.
2) Less energy will be wasted during the AC-DC conversion with a higher certification thus saving you on your electricity bill (often negligible)
3) the energy that is wasted is converted to heat, and a higher certification run cooler and possibly quieter (of course, this depends on the fan and the fan profile.

It means nothing except that one is 4% more efficient. Look at components, electrical performance, build quality and reviews.

The Antec HCG which is 80+ Bronze is worlds better than the EVGA G1 whch is 80+ gold

The 390x will be fine heat wise as long as you get one with a good cooler, like Sapphire's

WHY
WERE YOU TRYING
TO BUY
FUCKING INSTAGRAM USERNAMES

Oh god oh god nooooo
 
The EVGA 80 + W1 is not very good inside. Also, an 80 Plus efficiency rating doesn't automagically deem a PSU "good" or not. Check out the pinned topic we have about this on the PSU/cases subforum or in my sig.

That's not much better 
 
https://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9

Seems like one of those threads where the user is showing off his epic minecraft FPS, but doesn't want to admit to it. 800FPS is way overkill, but you're also looking into the ocean. I'd say anything above 60FPS is good.

Assuming you don't have a 900hz monitor yes

it would be good to know what temps you are running at, but it's a 4770k at 4.5Ghz. It's going to be hot.