Should I buy 400$ used in need of gaming computer

[William36]

ALIENWARE AURORA R3 CORE i7-2600, KINGSTON HYPERX BLU 16GB 1333MHz DDR3, 500GB HDD, ATI RADEON HD 5870 GDDR5 GRAPHIC CARD, DVD-RW, FACTORY CPU LIQUID COOLING INSTALLED
Money back guaranteed

 

[Deadpool]

ALIENWARE AURORA R3 CORE i7-2600, KINGSTON HYPERX BLU 16GB 1333MHz DDR3, 500GB HDD, ATI RADEON HD 5870 GDDR5 GRAPHIC CARD, DVD-RW, FACTORY CPU LIQUID COOLING INSTALLED
Money back guaranteed

If it´s in good condition yes. Otherwise build one yourself. somthing like this is around that budget:

https://pcpartpicker.com/list/hgvbd6

 

[Calin]

The CPU is still ok, the GPU not so much.
Like @Deadpool said, I'd build one yourself because you can customize it to your needs. The build he gave you is good.

 

[mistersprinkles]

I say buy it, sell the 5870, pick up an RX 480.