Sata Power Contacts Is This Good Specs For A Gaming Computer?

Is this good specs for a gaming computer? - sata power contacts

I've tried a new computer is pretty high and can games like crisis in the middle of playing the high settings preserved.
- ATI Radeon 4870 1024MB
- Windows XP
- Intel Core 2 Quad Q8400 775 'Yorkfield' 3.20GHz overclocked to 2.66!
- Gigabyte GA-EP45-DS3 Intel P45 (Socket 775) PCI-Express DDR2 mother
- Kingston HyperX 4GB (2x2GB) Dual Channel DDR2 8500C5 1066
- LG GH22NS30 22x DVD ± RW Dual Layer Burner SATA (black)
- Seagate Barracuda 7200.12 500GB SATA-II 16MB Cache - OEM
- Nero Akasa AK-967 CPU Cooler Heatpipe Direct Contact
- OCZ ModXStream Pro 700W Silent SLI Ready Modular Power Supply ATX2
- Arctic Silver 5 thermal compound professionally hand installed by our technicians

This is also done at 800 pounds is a bargain.
Thank you:)

It is also an Nvidia GeForce GTX 275 896MB
Best card for an extra £ 50?