Building a budget pc for game development(help)

[homie g dog]

I'm trying to build a pc for game development around $300. I'm on a tight budget so keep that in mind. try and read all detail and answer anything you can. sorry for the lengthy text but it's serious and important to me and I am in need of help!

From what I've experienced, game development isn't as heavy on rendering or decoding compare to video editing or animation. Most of the visuals are mainly processed in real time. There is still a lot of cpu involve processing the terrain or rendering near object distant in big scale 3d world.

I will be using unity 3d and am aiming for graphical level near that of ps3, 360 or wii u. So I will hit nowhere near 100k polycount per character/object nor will I use any texture above 1080

I currently have an old pc Gateway Desktop PC DX Series DX4720-03 Pentium Dual Core E5200 (2.50 GHz) 4 GB DDR2 640 GB HDD NVIDIA GeForce 7100 Windows Vista Home Premium 64-bit
http://www.newegg.com/Product/Product.aspx?Item=N82E16883113078

running windows 7

I was reading this thread:
http://www.tomshardware.com/answers/id-2825027/cheap-build-game-development.html

I'm very eager to try out these

AMD FX-4350 Vishera Quad-Core 4.2 GHz Socket AM3+ 125W FD4350FRHKBOX Desktop Processor

http://www.newegg.com/Product/Product.aspx?Item=N82E16819113326


and

PowerColor Radeon R7 360 DirectX 12 AXR7 360 2GBD5-DHE 2GB 128-Bit GDDR5 PCI Express 3.0 HDCP Ready CrossFireX Support ATX Video Card

http://www.newegg.com/Product/Product.aspx?Item=N82E16814131689&nm_mc=KNC-GoogleAdwords-PC&cm_mmc=KNC-GoogleAdwords-PC-_-pla-_-Video+Cards+-+AMD%2FATI-_-N82E16814131689&gclid=Cj0KEQjw7Ne_BRDRmP2ojKfzv98BEiQAPuqPyWFnTLtO3XaVUcnsACoha-ToLXZiaSunDj7g-SytlwYaAt_L8P8HAQ&gclsrc=aw.ds

does this gpu & cpu come with all fans needed to install?

can anyone recommend them or better choices same price? they are priced well

also, it seems the motherboard in the gateway is outdated so I will have to repurchase it
what power supplies and motherboard should I get with them?

is there anyway I can use my current gateway case and media slots instead of having to buy a new one? If not, which cases are recommended?

Much help would be appreciated. Thank you!

 

[Calvin7]

Micro-ATX Mini Tower Gaming Computer Case
http://www.newegg.com/Product/Product.aspx?Item=N82E16811353049

ASRock 970M Pro3
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157582

(2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231460&Tpk=N82E16820231460

SeaSonic M12II 520 Bronze EVO Edition 520W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151093

 

[hang-the-9]

For $300 you will not build a full system, a Windows license on it's own is $100.

I would not pay near $100 for an R7 360, get the GTX 460. http://www.newegg.com/Product/Product.aspx?Item=N82E16814125898&cm_re=rx_460-_-14-125-898-_-Product has a $10 off code good for today.