Does "Zebronics 450w value plus" smps gives continues power of 450w or its only peek power?

Ajay09347274590

Honorable
Oct 9, 2015
21
0
10,520
while playing "Shadow of mordor" resolution:1360*768, in both graphics settings lowest or ultra high it gives 6-9 fps.
i pressed alt+tab to minimize it
and again when i get back to game it goes to 25-35fps and for few seconds, after that again the same 6-9fps.
what i am thinking is, may be capacitors are providing power for few secs.
Processor: AMD fx 4300
Motherboard: GA78lmt usb3
Ram: GSkill 4GB 1600mhz
GPU: Zotac Nvidia gts 450 1Gb
Smps: Zebronics 450w
HDD: 1TB wd blue.