Don't take build advice from videos that are a year old. If you want a $500 PC go for something like this:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($119.99 @ Amazon)
Motherboard: *Gigabyte GA-H81M-DS2V Micro ATX LGA1150 Motherboard ($49.99 @ Amazon)
Memory: *VisionTek 8GB (1 x 8GB) DDR3-1600 Memory ($63.00 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Amazon)
Video Card: Asus Radeon R9 270 2GB DirectCU II Video Card ($138.99 @ Amazon)
Case: Cougar Spike MicroATX Mini Tower Case ($26.99 @ Newegg)
Power Supply: *EVGA 500W 80+ Bronze Certified ATX Power Supply ($29.99 @ Newegg)
Optical Drive: *Samsung SH-224DB/BEBE DVD/CD Writer ($14.99 @ Amazon)
Total: $493.93
Prices include shipping, taxes, and discounts when available
*Lowest price parts chosen from parametric criteria
Generated by PCPartPicker 2014-11-10 19:22 EST-0500