what is my Bottleneck?

[Onii-chan]

here is my build
i have $500 to upgrade it and would like to know what my bottle neck is so i can get the best upgrades for the best performance boost. any suggested upgrade builds can be liked using pc part picker and ill check them out. thanks in advance for all that help and sorry if this is in the Wrong section wasn't sure were to post it

 

[sharndowg]

First of all, do not put that power supply anywhere near your PC. It will catch fire even before you turn it on. The build could be a little more efficient, so I have modified it a little to your budget of $500. CPU I upgraded along with motherboard. The RAM i changed to 2 sticks of 4GB to take advantage of dual channel memory. Graphics card is a hella lot faster and the PSU will treat you well.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-4170 3.7GHz Dual-Core Processor ($111.99 @ NCIX US)
Motherboard: ASRock H97M Anniversary Micro ATX LGA1150 Motherboard ($51.98 @ Newegg)
Memory: Mushkin ECO2 8GB (2 x 4GB) DDR3-1600 Memory ($39.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.89 @ OutletPC)
Video Card: EVGA GeForce GTX 960 2GB SuperSC ACX 2.0+ Video Card ($175.99 @ NCIX US)
Case: Cougar Spike MicroATX Mini Tower Case ($32.99 @ SuperBiiz)
Power Supply: Antec Green 450W 80+ Bronze Certified ATX Power Supply ($39.99 @ Directron)
Total: $502.82
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-10-02 15:35 EDT-0400