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Old 01-14-2018, 04:32 AM   #97
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Join Date: Sep 2014
Location: St. John's, NL, Canada
Posts: 1,467

Originally Posted by video178 View Post
BernH, But the size of the card smaller than lane Pcie4, is it still ok?
The size of the slot is not the relevant thing, unless it is too small for the card, in which case it will not work. As I said above, the physical size only dictates what speed the slot could possibly be configured for, not what it is configured for. What is relevant is the speed that the slot operates at.

The card needs an x4 capable slot. The only slots that are listed as operating at x4 or higher speeds are slots 2 and 4 which share 16 (x16) PCIe lanes. Assuming you have a graphics card in slot 2 the only option left is slot 4. With nothing in slot 4, slot 2 runs at x16, but when something is in slot 4, they both run at x8, unless, as noted below, you have an M2 drive, in which case they operate at x8 and x4 speeds, dedicating 4 lanes (x4) to the M2 drive. All the other slots are either physically too small, which means they run at x1 or x2, or are physically an X16 slot but running at x2 like slot 5.

This is from the specifications on the asrock wesite. :
- 2 x PCI Express 3.0 x16 Slots (PCIE2/PCIE4: single at x16 (PCIE2); dual at x8 (PCIE2) / x8 (PCIE4))
- 1 x PCI Express 2.0 x16 slot (PCIE5: x2 mode)
- 2 x PCI Express 2.0 x1 Slots
- 1 x mini-PCI Express Slot

*If M2_1 slot is occupied, PCIE2 slot will run at x8 mode, and PCIE4 slot will run at x4 mode.

**mini-PCI Express slot is shared with PCIE3 slot.

You will see in my forum signature that I am using an an Intensity Pro 4K and an MSI Z97 Gaming 7 Motherboard which is very similar to yours in terms if the slot configuration. Trust me, this is not something I have never done before.

The main differences in our boards is that the 3 x16 sized slots on my board share the same PCIe lanes, so that the one on mine that is equivalent to your slot 5 is an x4 slot instead of an x2 slot, but using it would force the one on mine that is equivalent to your slot 4 to drop to x4 speed and my slot 2 to drop to x8, and I have 2 more x1 slots.

The manufacturers use these x16 slots in a shared configuration for implementation of nVidia SLI or AMD CrossFire graphics card setups, where the cards are physically an x16 card, but when installing more than one in a system, the cards electronically divide the 16 PCIe lanes that are normally used for a single graphics card between the two cards, causing each one to operate at x8, or as on my board if 3 cards are in use, x8, x4 and x4
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Last edited by BernH; 01-14-2018 at 04:13 PM.
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