Overclock to Play 4K videos

Hi

Guys help me do some overclocking please :)

I'd like to play 4K videos but they lag so badly. Instead of buying a proper graphics card I want to see if I can make them play only by overclocking.

I think my rig is okay in regards of CPU, RAM etc. although I don't have a dedicated graphics card, which I guess is the primary cause of this problem since they are quite mandatory for 4k.

However, this is an AMD APU with "Dedicated graphics" built-in, and in 1080p it works great. It has 768MB of built-in VRAM (which is not at all enough for 4K, I'm aware) and it can assign several gigabytes of RAM. That must worth something.

I don't want to buy a graphics card - I wanna do some overclocking :)

Board: Gigabyte GA-F2A88XM-HD3P (rev. 1.0) (A88X chipset)
CPU: AMD A6-5400K (Black Edition APU, 3.6Ghz base clock, 3.8Ghz turbo + unlocked ratio (overclocking has a big potential)
Memory: HyperX FURY 2 x 4GB (8GB Dual-Channel DDR3-1800 kit)
Disk: Kingston SSD
OS: Win10 Pro x64