X570 PG Velocita Second pciE slot slow

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   I'm trying to SLI two 1080 TIs, but the option for turning it on never shows up.  I got to digging and installed GPU-Z and found my second pciE slot runs at 3.0x16 @ x1 1.1.  
So I started by swapping the two cards around, issue followed the slot.  
I then removed the second card, leaving just top one.  It ran as expected.  (I don't remember the value.)
Then I installed the card in the bottom slot and it's running at 16 3.0@4 3.0.
I've updated bios to 2.0, reset the bios to defaults, updated chipset drivers, nothing works.  
Am I mistaken that slot can run a full speeds?
I'm not a noob, but not a master with all the bios settings.  
ryzen 7 5800x
32 GB memory
SSD, no M.2 drive.

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H-D Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Jun 2022 Status: Offline Points: 85	Post Options Post Reply Quote H-D Report Post Thanks(0) Quote Reply Topic: X570 PG Velocita Second pciE slot slow Posted: 02 Jun 2022 at 8:07am
	I'm trying to SLI two 1080 TIs, but the option for turning it on never shows up. I got to digging and installed GPU-Z and found my second pciE slot runs at 3.0x16 @ x1 1.1. So I started by swapping the two cards around, issue followed the slot. I then removed the second card, leaving just top one. It ran as expected. (I don't remember the value.) Then I installed the card in the bottom slot and it's running at 16 3.0@4 3.0. I've updated bios to 2.0, reset the bios to defaults, updated chipset drivers, nothing works. Am I mistaken that slot can run a full speeds? I'm not a noob, but not a master with all the bios settings. ryzen 7 5800x 32 GB memory SSD, no M.2 drive.

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 27848	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 02 Jun 2022 at 5:09pm
	The board doesn't support SLI. SLI requires a specific license from Nvidia as well as support for x8 + x8 (minimum) on the PCIe x16 slots. Your board supports only x16 + x4 with a 5800x. The reported @ x1 1.1 is only because the second GPU is not being loaded (because SLI can't be enabled). The x1 1.1 state is default power saving.


H-D Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Jun 2022 Status: Offline Points: 85	Post Options Post Reply Quote H-D Report Post Thanks(0) Quote Reply Posted: 02 Jun 2022 at 11:03pm
	Well guess I'm an idiot. My old X370 supported it, thought this would too. Thank you for the extensive reply!

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 27848	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 03 Jun 2022 at 4:39am
	Sorry to be the bearer of bad news Glad I could help.