PCIE slot speed

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   Dear rayray842,

Greetings, this is ASRock TSD.

With AMD Ryzen series CPUs, VGA cards could be installed on both PCIE x16 slots.
Single at x16 (PCIE2); dual at x8 (PCIE2) / x8 (PCIE4) speed.

With AMD 7th A-Series APUs, VGA cards could only be installed on first PCIE x16 slot and the PCIE speed is x8.

Please refer below links, there is detailed Specification.
http://www.asrock.com/MB/AMD/X370%20Killer%20SLI/index.asp#Specification

Thanks!

All the best,
ASRock TSD

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ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8787	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Topic: PCIE slot speed Posted: 15 Aug 2017 at 3:20pm
	Dear rayray842, Greetings, this is ASRock TSD. With AMD Ryzen series CPUs, VGA cards could be installed on both PCIE x16 slots. Single at x16 (PCIE2); dual at x8 (PCIE2) / x8 (PCIE4) speed. With AMD 7th A-Series APUs, VGA cards could only be installed on first PCIE x16 slot and the PCIE speed is x8. Please refer below links, there is detailed Specification. http://www.asrock.com/MB/AMD/X370%20Killer%20SLI/index.asp#Specification Thanks! All the best, ASRock TSD

parsec Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 04 May 2015 Location: USA Status: Offline Points: 4996	Post Options Post Reply Quote parsec Report Post Thanks(0) Quote Reply Posted: 04 Aug 2017 at 9:12pm
	The PCIE4 slot is definitely PCIe 3.0 x8 electrically, while being x16 physically. A standard x16 video card will operate at PCIe 3.0 x8 in the PCIE4 slot.


AlbinoRhino Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 28 Apr 2017 Status: Offline Points: 153	Post Options Post Reply Quote AlbinoRhino Report Post Thanks(0) Quote Reply Posted: 04 Aug 2017 at 4:55pm
	I would like to know this as well. I want to do a vertical mount on my GPU, but would have to use the PCIE4 slot to avoid a huge ribbon setup. PCIE2 (PCIe 3.0 x16) is used for PCI Express x16 lane width graphics cards. and PCIE4 (PCIe 3.0 x16) is used for PCI Express x8 lane width graphics cards.

rayray842 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 25 Jun 2017 Status: Offline Points: 3	Post Options Post Reply Quote rayray842 Report Post Thanks(0) Quote Reply Posted: 04 Aug 2017 at 2:19pm
	There are two PCI-E X16 slots on X370 Killer SLI. If I use the botton slot and still get 16X or 8X? Because my CPU fan is bigger so I can only install graphic card on below slot. Please advise.