[Equipment Configurations] Computer, will this work?

Processor & Memory:
Intel® Core i7-4790 Processor 3.6GHz
16GB DDR3 1600MHz RAM

1TB 7200RPM SATA Hard Drive
DVD-RW (Writes to DVD/CD)

Operating System:
Microsoft® Windows 7 Professional (64-bit)

Graphics & Video:
4GB NVIDIA GeForce GTX 745 Graphics

Dell Wireless-N 1703 + Bluetooth® 4.0
10/100/1000 Gigabit Ethernet

Integrated 7.1 with Waves MaxxAudio® Processing

Keyboard & Mouse:
Dell Wired Multimedia Keyboard & 6-Button Laser Mouse

I/O Ports & Slots:
6x USB 3.0
4x USB 2.0
1x Multi-Media Card Reader

AVI Ports:
Combination Headphone / Microphone Jack

I would bump the video card up to a 750 if it was me. But everything else looks good.
This one is actually from a big box store. It is $200.00 cheaper than a build with a GTX 650.
One question about this thread. Could the 750 be easily switched? Or even a 960?
It should but you need to make sure that the PowerSupply in the computer is powerful enough to run the graphics card.