EXtreme PSU calculator true or false?

Hello there,

I just bought a new radeon GPU and wondering whether I have the necessary power to run my custom built PC smoothly so here are the details I got from analyzing with eXtreme power supply calculator. Is that true? I have a stock (chinese) 450W PSU so do you think that's enough for my PC?

System Type: 1 physical CPU
Motherboard: Regular - Desktop
CPU Socket: Socket LGA 775
CPU: Intel Pentium Dual-Core E5400 2700 MHz Wolfdale-3M
CPU Utilization (TDP): 90% TDP

RAM: 1 Stick DDR3 SDRAM
Video Card 1: AMD Radeon HD 5570

IDE HDD 7200 rpm: 1 HDD
Regular SATA: 1 HDD

DVD-RW/DVD+RW Drive: 1 Drive

Sound Blaster - All Models: Yes

USB: 3 Devices
Fan Controller: Yes
Front Bay Card Reader: Yes

Fans
Regular: 2 Fans 80mm;

Keyboard and mouse: Yes

System Load: 90 %


Minimum PSU Wattage: 209 Watts
Recommended Wattage: 259 Watts