A doubt about graphics card TDP

javier2409

Honorable
Dec 20, 2014
12
2
10,520
I wanted to buy a brand new graphics card and my psu is not very good, so I decided to buy a new one too, but then I realized that my current gpu has a tdp of 108w and the one I want to buy has only 75w
I googled a bit and I know that tdp doesnt really mean power consuption, but most benchmark/gpu comparison sites implicitly say that it is related (and some others say it explicitly, for example hwcompare.com which actually says "power consumption (max tdp)").
So is there a guarantee that the new graphics card will work fine if my current one does under the same psu?