Hello, a really useful reference for PSU quality is "Tom's Hardware PSU Tiers 2.0"
I recommend looking it up for your purchasing decisions. However, to answer your question, I would stay away and find a better model if you're able. If you already have it, I recommend replacing it. Here is the source of my reasoning:
What about the EVGA 500W 80 PLUS ATX12V Power Supply ?
can it handle the EVGA GTX 750Ti SC 2G DDR5 ?
And i also have Lenovo ThinkCentre E73 mini tower (the big case), do you know what PSU Size does it have ?
EVGA 500w PSU will be fine but you will need this adapter.
http://www.amazon.com/Power-Supply-Adapter-Cable-Lenovo/dp/B00WE5KSFQ/ref=sr_1_1?ie=UTF8&qid=1455907215&sr=8-1&keywords=lenovo+24+pin+adapter