Someone to explain to me about the GPU-Z

[Loreim_20]

Processor: AMD FX-4300 Quadcore
Graphics card: Geforce GTX 750 TI MSI GAMING 2GB DDR5
Power supply: 600W (Rail de +12V/24A) (No gaming)
Ram: 8GB

I need help, PerfCap reason, what does it mean?

http://gpuz.techpowerup.com/17/05/03/vft.png

 

[brispuss]

Have a look here.