PSU Unknown Brand ???

I was just planning to upgrade my gpu from hd 6450 to 7870 , but amd website says that minimum requirements is 500w where my psu is ( touchmate 450w ) model and I did some researches and didn't found anything about this psu , and amd also recommends psu that are certitifed...... something like that
so do you think I can upgrade or is there a problem , keep in mind that im using this psu for long time and had 0 problems
here are some more details .... dc output max...
+12 , -12...... 16A , ......
model atx - 450w p4....
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  1. You need new psu.get corsair cx 500w psu.
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