About PSU and the wattage

[Ace011]

Hello, i just bought (yesterday) an GTX 1050 Ti 4 GB OC Edition, without to know this PSU stuffs, because i just saw from the sticker inside of my computer that is 400 W and that was all.. But then a friend on Facebook told me that even if on the sticker is being typed 400 W, maybe is less than that, and 1050 needs just 300 W recommend, so my question is, since i'm already running the pc and i had played games, i think everything it's fine ? or should i need to change the PSU ? i mean i want to know if its capable to keep with the GPU, and to add that the PSU is not something like a brand Cooler Master, Corsair etc. but is just some random, since i bought this pc few yrs ago as Custom pc i did not choose the components inside. Oh and the graphic card itself doesn't have extra connectors or pins.. it's just plug and that's it.. Here's two pics from the stickers.. First i'm very sorry for not the best quality, but my pc is on tight place, i can't make some nice pics.. but overall those are the numbers, hope for some reply and some advice:

http://imgur.com/vJXPefw

http://imgur.com/HKjxVWp

And also another things.. i'm just causal gamer, not hardcore one.. or try to overclock my processor or the gpu.. i just want simple games and that.. Many thanks and happy holidays

just to add i opened the case and i write down the numbers from the psu:

115/230 VAC 8A/4A 50/60 Hz
+3.3V +5V +12V1 +12V2 -12 +5VSB
15A 20A 8A 14A 0.8A 2A
120W MAX 96W MAX 10W
400W

 

[geofelt]

You are good.
The psu may not be top quality but so long as it runs you are probably ok.
GTX1050ti runs on slot power only which is only 75w. If you need an aux 6 pin power connector, that is 75w more.