HP ENVY 15z-j000

I just ordered a 15z-j000 configured like this and I'm wondering if i should have upgraded the CPU to an A10-5750m. I'm using this computer for school and gaming (School>Gaming) which is why I didnt get some Maxed out 1080p Crysis 3 computer but i did want a good looking above average computer that can play source games like TF2 maxed out and games like Borderlands 2, Planetside 2, Saints Row III, IV, and Minecraft.

Also I am unsure how HP's AMD dual graphics work. is it similar to Nvidia Optimus where the graphics card change depending on the intensity of the graphics or like normal AMD crossfire where both work together when supported, or does it do both

thanks in advance

Operating system
Windows 8 64

Processor
AMD Quad-Core A8-5550M Accelerated Processor

Graphics

AMD Radeon HD 8750M + HD 8000 Series Dual Graphics
Memory
6GB DDR3 System Memory (2 Dimm)

Memory Slots
2 DIMM

Hard drive
750GB 5400 rpm Hard Drive

Optical drive
No Internal DVD or CD Drive

Network interface
10/100/1000 Gigabit Ethernet LAN
Wireless
802.11b/g/n WLAN

Power supply
65W AC power adapter

Battery
6-Cell Lithium-Ion Battery

Battery Life
Up to 9 hours and 45 minutes

Ports
4 SuperSpeed USB 3.0; 1 HDMI; 1 headphone-out/microphone-in combo; 1 RJ45

Expansion Slots
Multi-format digital media card reader
Energy Efficiency Compliance
ENERGY STAR® qualified; EPEAT® Silver
External SpecsBack to the top

Display
15.6-inch diagonal Full HD BrightView LED-backlit Display (1920x1080)

Keyboard
Standard Keyboard