Can you improve my PC?

3Dns

Distinguished
Dude first of all Anniversery motherboard works for the G3258 cpu so you have to change it.
Second take a dual channel ram like 2x4GB 1600mhz
Next dont take a 200$ cpu with a 135 GPU if you are gamer you have to take better GPU.
You will not play any game at 144fps, so you dont need this monitor.
I can help you and build a good gaming rig withh 1000$.
Is this USD ?

PS Take the Windows 8.1 too is good :)
 

3Dns

Distinguished
Something like this i think is better for 100% gaming rig.

PCPartPicker part list / Price breakdown by merchant

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($106.01 @ OutletPC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($28.66 @ Amazon)
Motherboard: ASRock 970 Extreme3 R2.0 ATX AM3+ Motherboard ($59.99 @ Newegg)
Memory: Team Vulcan 8GB (2 x 4GB) DDR3-1600 Memory ($69.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.98 @ OutletPC)
Video Card: EVGA GeForce GTX 970 4GB ACX Video Card ($329.99 @ Amazon)
Case: Apevia X-SNIPER2-BL ATX Mid Tower Case ($49.99 @ Amazon)
Power Supply: Thermaltake SMART 650W 80+ Bronze Certified ATX Power Supply ($39.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.99 @ Newegg)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Monitor: Asus VN247H-P 23.6" Monitor ($164.30 @ B&H)
Total: $1009.87
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-20 22:24 EDT-0400
 
Solution

RazerZ

Judicious
Ambassador
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4430 3.0GHz Quad-Core Processor ($179.98 @ OutletPC)
Motherboard: MSI Z87-G41 PC Mate ATX LGA1150 Motherboard ($79.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.98 @ OutletPC)
Video Card: HIS Radeon R9 270X 2GB IceQ X² Video Card ($159.99 @ Newegg)
Case: NZXT Source 210 Window ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($25.99 @ Newegg)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Monitor: AOC i2267Fw 60Hz 22.0" Monitor ($129.99 @ Amazon)
Total: $764.88
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-20 22:25 EDT-0400