Unless it's a laptop, or some other kind of specialty/proprietary power interface, one power cable is essentially the same as the next. I have to say though, 600W seems a bit light for a system like yours.
Still, if it's new, why bother trying to figure it out? Make it Cyberpowerpc's problem to fix. If they can't fix it they can give you a refund and you can take your money to someone else who can build a reliable system for you.
I recently got my computer from cyberpowerpc, and after i set everything up everything worked fine until it randomly shut down without warning. Turns out i used my old power cord instead of the new one. After I fixed that, my computer started randomly freezing instead of shutting down, I don't know what else might be the problem since the computer is new. Please help me I don't know what to do and I'm really upset since this is my first gaming computer. My system info:
CPU: AMD FX-8350 4.00 GHz Eight-Core AM3+ CPU 8MB L2 Cache & Turbo Core Technology
FAN: Asetek 510LC Liquid Cooling System 120MM
HDD: 500GB Western Digital Caviar Blue SATA-III 6.0Gb/s 7200 RPM HDD (Single Drive)
MEMORY: 8GB (4GBx2) DDR3/1600MHz Dual Channel Memory
MOTHERBOARD: [3-Way SLI/CrossFireX] MSI 990FXA-GD80 AMD 990FX Chipset DDR3 Socket AM3+ ATX Mainboard w/ OC Genie,Winki 3 & 7.1 HD Audio, eSATA, GbLAN, 4 Gen2 PCIe, 2 PCIe X1 & 1 PCI
OS: Microsoft® Windows 7 Home Premium (64-bit Edition)
POWERSUPPLY: 600 Watts - Standard 80 Plus
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO
VIDEO: AMD Radeon HD 7950 3GB 16X PCIe 3.0 Video Card (Major Brand Powered by AMD)
Model Number: AXP970