Hi Hayden, here are the recommended specs to play this game :
CPU : Intel Core i5-2300 or AMD Phenom II X4 940 or better
RAM: 4 GB
Video Card: NVIDIA GeForce GTX 560 or AMD Radeon HD 7750 with 1 GB VRAM or better
Based on your build, it can surely play ARMA III on High/Ultra settings.
You can look at this page for some benchmarks :
http://www.tomshardware.com/reviews/geforce-gtx-750-ti-review,3750-7.html
Here you can see it has around 30 FPS on high settings on ARMA III :
You can see here how it meets the requirements ...