It is also relevant. You can't throw in a video card in a motherboard which has not got a PCIE Slot. Who knows?
Both are important. First we have to check out his motherboard specifications then PSU and then suggest a card by taking his CPU in mind to prevent bottlenecks.
Thank you for ur concerns..
My PSU is INTEX TECHNO 450(20+4pin) .
Hope this might help you for your recommendation.
And about the budget .. any thing below 10k .