Is it still possible to mine for bitcoins using a normal desktop computer nowadays?
It is possible? Yes. But the question is it worth it? No.Its just a waste
of time and your money. You offer, GPU minning.
There are many reasons for this; When you get away from being lucrative, at least you have a good gaming computer.
However the GPU process will not enough to do mining with the profit and continuous use of the mining process will consumes a high electricity and cost would be high. Therefore, don't do the desktop mining and cloud mining. If you look into go for mining investment you can try on the antminer or solar mining which will provide the decent income.