It will not be possible to build a new gaming system for 300 RON. You will need at least the following:
SSD 120GB +
I'm assuming you already have a monitor, keyboard and mouse and you will be using a free operating system, e.g. linux.
The cheapest SSD 120GB on dc-shop.ro is:
This costs 199 RON
There is no way you can buy the folowing for 101 RON
This site is great when building rigs : pcpartpicker.com
It's been suggested that maybe you are just looking for an SSD drive with a budget of 300 RON.
If that is the case then I would recommend spending a bit more and getting a 240GB SSD drive. 353 RON
To me anything less than 200GB in an SSD is a false economoy. If you absolutely cannot spend more than 300 RON.
Has the best read/ write speeds. 291 RON
However, when gaming the graphics card will largely determine the frame rate and not the SSD.