Read a couple reviews on external HDD using USB3.0. Tests were run with same setup and used both USB 3.0 and USB 2.0 ports. It shows that USB 3.0 outperformed USB 2.0 buy quite a margin on same equipment.
Seagate BlackArmor PS 110 USB 3.0 Hard Drive (500GB) - Review, Specs, Prices

Western Digital My Book USB 3.0 drive ? Register Hardware

Even though these drive wont saturate the USB 2.0 buss they do perform a lot better on the USB 3.0 buss.
Jim
Seagate BlackArmor PS 110 USB 3.0 Hard Drive (500GB) - Review, Specs, Prices

Western Digital My Book USB 3.0 drive ? Register Hardware

Even though these drive wont saturate the USB 2.0 buss they do perform a lot better on the USB 3.0 buss.
Jim
My Computer
- Computer type
- PC/Desktop
- Computer Manufacturer/Model Number
- Home Built
- OS
- Windows 8.1 Pro w/Media Center 64bit, Windows 7 HP 64bit
- CPU
- Phenom II X6 1100T
- Motherboard
- ASUS M5A99X EVO
- Memory
- Crucial Balistic 8gb DDR3-1866 CL9
- Graphics Card(s)
- MSI R6850 Cyclone IGD5 PE
- Sound Card
- On Board
- Monitor(s) Displays
- ASUS VE258Q 25" LED with DVI-HDMI-DisplayPort
- Screen Resolution
- 1920 x 1080
- Hard Drives
- Two WD Cavier Black 2TB Sata III, WD My Book Essential 2TB USB 3.0
- PSU
- Seasonic X650 80 Plus GOLD Modular
- Case
- Corsair 400R
- Cooling
- Antec Kuhler H2O 620, Two 120mm and four 140mm
- Keyboard
- Logitech K120
- Mouse
- Logitech Marble Mouse USB, Logitech Precision Game Pad
- Internet Speed
- 15MB
- Antivirus
- Norton IS 2013, Malwarebytes Pro Beta 2
- Browser
- IE-11, FF-27
- Other Info
- APC UPS ES 750, Netgear WNR3500L Gigabit & Wireless N Router with SamKnows Test Program, Motorola SB6120 Gigabit Cable Modem. Brother HL-2170W Laser Printer, Epson V300 Scanner
