Hi Kizwan.
firstly thank you very very much for your explanation. Yours solved all of my questions at once. So much better than all other explanation about PCIe.

but still i have some questions that i can't find out.
I am using dell xps 1645 and have these values for my PCIe.

PCI Express Controller
PCI-E 2.0 x1 port #1 Empty
PCI-E 2.0 x1 port #2 In Use @ x1 (Intel® Centrino® Advanced-N 6200 AGN [8086-422C] [NoDB])
PCI-E 2.0 x1 port #4 Empty
PCI-E 2.0 x1 port #5 In Use @ x1 (Ricoh PCI-E Memory Stick Host Controller, Ricoh PCI-E SD Bus Host Adapter)
PCI-E 2.0 x1 port #6 In Use @ x1 (Broadcom NetLink BCM5784M PCI-E Gigabit Ethernet Controller)

You said that we have to use #1 & #2 or #3 & #4 etc.. to use x2 links right?
but according to the values of my computer, 3# does not show up. Is that express card slot? and Why can not i use #1 and #3 (if this is express card slot) to do x2 link?

Oh and
Can I use any graphic cards such as gtx 580, 570 or other good ones better than gtx 560, if i have a good enough PSU?
the reason why i ask you is that most of people left the review with gtx560, and have not seen anyone using better ones than that.. so i doubt that there is limit for the eGPU.

Thank you so much again!

thank you so much !

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Added on April 26, 2012, 3:39 pmHI. I actually have one more question.
Im buying N570GTX Twin Frozr III Power Edition/OC which requires around 480W. Then, would any PSU over 500W be good enough to run it?
Oh also Which one do you recommend me to use 560, 560ti, or 570?

This post has been edited by jamiedha: Apr 26 2012, 03:41 PM