Is my PC strong enough to stream 720p 60fps while holding a solid 120fps in game, or are upgrades required?

TheNightManCometh

Reputable
Dec 2, 2016
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4,510
Just getting into streaming games like H1z1, PUBG and Fortnite with friends on Twitch.

Fortnite seems to be taking over my channel (yes, I've become one of those guys) and I am able to stream it comfortably at 720p 60fps with 60fps in game.
However, I want to be able to run Fortnite up to at least 120fps in game (preferably higher but what do I know) while being able keep the 720p 60fps.

I've been using Streamlabs OBS and everything is fine until I turn the in game fps up from 60 to 120, then I start to get lagged and dropped frames but mainly lag causing the stream to look choppy and gross.

Internet speed:
Download of 180 and an upload of 7.5.

PC Specs:
CPU: Intel - Core i7-5820K 3.3GHz 6-Core Processor

CPU Cooler: be quiet! - Dark Rock 3 67.8 CFM Fluid Dynamic Bearing CPU Cooler

MB: Asus - X99-A II ATX LGA2011-3 Motherboard

Memory: G.Skill - Ripjaws Series 16GB (4 x 4GB) DDR4-2666 Memory

Storage: Crucial - MX300 275GB 2.5" Solid State Drive
Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive

Video Card: Zotac - GeForce GTX 1080 8GB AMP! Edition Video Card

Case: NZXT - S340 (Black/Red) ATX Mid Tower Case

Power Supply: EVGA - SuperNOVA G2 650W 80+ Gold Certified Fully-Modular ATX

OS: Microsoft - Windows 10 Home OEM 64-bit

Monitor(s): ASUS VG248QE 24" Full HD 1920x1080 144Hz 1ms HDMI Gaming Monitor
AOC - Q2778VQE 27.0" 2560x1440 60Hz Monitor

Streamlabs settings:
x264 encoder
1280x720 Output Res.
3000 Bitrate
2 Keyframe Interval

Fortnite settings:
Display Res: 1920x1080 16:9
View Distance: epic
Shadows: off
Anti-aliasing: off
Textures: low
Effects: low
Post Processing: low
V-sync: off
Motion blur: off

I have no idea if my current setup is capable of running the game at 120fps while streaming it at 720p 60fps. So I listed as much info as I could think of.

Any advice on settings or an upgrade to do so would be greatly appreciated.
Let me know if more information is needed.

Thanks in advance.