AshrAf59 :
spdragoo :
What's your current GPU, & what games will you be playing?
I am currently using the Nvidia 260 Gtx and I'm currently playing games from 2013 and below but I want to play games from 2015/2016 like Witcher 3, Rise of the tomb raider, Gta V etc
http://www.tomshardware.com/reviews/gpu-hierarchy,4388.html
Your GTX 260 badly needs replaced, as it's considered a 12th-tier GPU. Based on Tom's recommendations, the 380 would be a good buy, as it performs better at 1080p than the GTX 960.
However, your CPU (most likely the Core 2 Quad Q8200, as pointed out earlier) is still going to hold you back a bit. Unfortunately, that CPU is a Socket LGA 775 CPU, so your ability to get much better performance is going to be limited (4 generations back from Socket LGA 1151, the current Skylake socket) without a full motherboard replacement.
http://www.tomshardware.com/reviews/cpu-hierarchy,4312.html
Ideally, since your CPU is pretty far down the list (7th tier), & the recommendation is to only upgrade if you can improve by at least 2 tiers, you'll want to consider full replacement of the motherboard & CPU. However, since you're also talking about replacing RAM, as well as having to reinstall Windows, that might not be something you want to do right now.
With that in mind, see if you can pick up a better CPU that works with your motherboard. Your Core 2 Quad is not only the weakest Yorkfield-based CPU, it's the lowest Core 2 Quad on the hierarchy (as even the older Kentsfield-based Q6600 is a tier higher). Bumping up to a Q9400/9450/9550 raises you up to 5th-tier, & also puts you at the same level as the mainstream AMD Phenom II chips, while a Q9650 or higher puts you at 4th-tier with the 95W AMD FX chips & their Kaveri A-series.