Asus Rampage II Extreme with 2(two) m.2 PCIe adapter cards

[veselinbg]

Hello everyone! First of all, congratulations for the Great forum!

Here is my preliminary notes:
My motherboard is Asus Rampage II Extreme (stock 2101 bios) and has three PCIe 2.0 x16 slots, which can be configured to work as x16 x8 x8.
Recently I bought a Samsung 950 Pro, 256 GB and a PCIe 3.0 x4 adapter for M.2 NGFF PCIe SSD. When the adapter is installed on the third (white) PCIe x16 slot, everything working fine: Samsung 950 Pro is recognized by the bios and now it’s the system drive. But if I put the adapter card on the second (blue) PCIe x16 slot, the video card (installed on first PCIe x16 slot) is disabled, there is no video signal.
Since, I have another spare Corsair MP500 m.2 SSD, I would like to make good use of the second PCIe x16 slot, if it is possible.
I did some research before posting here and the best description of my case, I found on an Adaptec Support page:

Note: Some motherboard specify that one or more of the PCIe x16 slots are designated graphic slots. In these cases other types of controllers may not work in these slots. In some motherboard that support two graphic controllers, there may be a jumper to control whether the secondary PCIe x16 slot can support other devices other than graphics controllers. Please refer to the manufacturer’s documentation of your particular motherboard to see whether the x16 slot(s) can support devices other than a graphic controller and any special configuration required for a non-graphic controller to work in such a slot.

So, here is my question: Is there a way to force the second PCIe x16 slot to work as "general purpose" PCIe slot and not as "graphic slot" only? Do I need bios modding?
Thanks!

[veselinbg]

Any suggestion?
If my question is not in the right topic, a moderator of the forum, can move it to the right place.

[Fernando]

@veselinbg :
Welcome to the Win-RAID Forum! I am sorry for my delayed reply.

@veselinbg

Is there a way to force the second PCIe x16 slot to work as “general purpose” PCIe slot and not as “graphic slot” only?

According to my knowledge this can only be done by the mainboard manufacturer and not by the user.

Regards
Dieter (alias Fernando)

[jcorrea]

@veselinbg :
Try to enter on bios -> Advanced -> Chipset -> NorthBridge Chipset Configuration -> PCIe Selector

And change from "AUTO" to "x16 x1 mode".

Please let us know if this works.

[veselinbg]

@jcorrea
I already done this, now the PCI selector is set to “x8 x8 mode”. Unfortunately, this doesn’t help.
I didn’t try to set it to “x16 x1” mode, because I want to use the third PCIe x16 slot at the highest possible speed.