Windows 7 - Can anyone tell from their experience a USB 3 HD that works on Dell?

Hi,
I am looking for a portable External HD that will work on a Dell Laptop USB 3.
I need for quick transfers of large photo files.

I find in Amazon products purporting transfer rates of over 2GB/sec on a USB 3 port.

I want to know if anyone has experience with Dell Inspiron or Dell XPS Laptop that come with USB 3 capable of transfer rates of 2GB/Sec? & works without any flow?

Or the technique is still in infancy and not like the Apple's thunderbolt?

There are Western Digital,Buffalo,Iomega...
At one time on internet forum discussion telling some of the Buffalo has the Samsung's HD in it [rather than Western Digital] and if one get that would be like lottery win!!
If any of the above will transfer those claimed rates of transfer on a Dell Inspiron or a Dell XPS laptop?
Any body with experience could guide me,
Thanking you

u wont get 2GB/sec impossible

As stated above, 2GB/sec is not going to happen.

2Gb/sec is more likely. However, unless the external drive is running SSD's or is a RAID type cabinet...you aren't going to approach 2Gb/sec either...as that would come out to nearly 250MB/sec...and most external hard drives that spin at 7,200RPM seem to top out around 90-110MB/sec