Sli in top and bottom pci-e slots?

[DooMeR]

Hello just a quick question.

I need to improve airflow to my top graphics cards in sli i am just wondering if its possible to use the cards in the top and bottom pci-e slots if i got a sli bridge long enough.

My motherboard is a asrock Z68 Extreme4 Gen3

Thank you

http://www.asrock.com/mb/photo/Z68 Extreme4 Gen3(m).jpg

 

[Doco]

Your manual has PCIE 4 and PCIE 2 as the 3.0 x16 bandwidth - here -

Spoiler

PCIE slots:
PCIE1 / PCIE3 (PCIE 2.0 x1 slot) is used for PCI Express cards with x1
lane width cards, such as Gigabit LAN card, SATA2 card, etc.
PCIE2 / PCIE4 (PCIE 3.0 x16 slot) is used for PCI Express x16 lane
width graphics cards, or used to install PCI Express graphics cards to
support CrossFireXTM or SLITM function.
PCIE5 (PCIE 2.0 x16 slot) is used for PCI Express x4 lane width graphics cards, or used to install PCI Express graphics cards to support
3-Way CrossFireXTM function.


1. In single VGA card mode, it is recommended to install a PCI Express
x16 graphics card on PCIE2 slot.
2. In CrossFireXTM mode or SLITM mode, please install PCI Express x16
graphics cards on PCIE2 and PCIE4 slots. Therefore, both these two
slots will work at x8 bandwidth.
3. In 3-Way CrossFireXTM mode, please install PCI Express x16
graphics cards on PCIE2, PCIE4 and PCIE5 slots. Therefore, PCIE2
and PCIE4 slots will work at x8 bandwidth while PCIE5 slot will work
at x4 bandwidth.
4. Please connect a chassis fan to motherboard chassis fan connector
(CHA_FAN1, CHA_FAN2 or CHA_FAN3) when using multiple
graphics cards for better thermal environment.
5. To run the PCI Express in Gen 3 speed, please must install the Ivy
Bridge CPU which supports PCI Express Gen3. If you install the
Sandy Bridge CPU, the PCI Express will run only at PCI Express Gen
2 speed.

I'm sure you would be able to run it easy enough but I'm not 100% sure, I know the performance hit from PCIE 2 is pretty much negligible but I've not encountered running 1 gpu in 3.0 and 1 in 2.0

Just noticed that lane 5 - bottom lane, will only.be running at x4 bandwidth