Intel Motherboards - Graphic card on PCIE2?

Print Page | Close Window

Graphic card on PCIE2?

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=7079
Printed Date: 02 Aug 2025 at 1:39am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Graphic card on PCIE2?

Posted By: PistolPat
Subject: Graphic card on PCIE2?
Date Posted: 27 Dec 2017 at 1:43pm

" rel="nofollow - I have:
Fatal1ty X299 Professional Gaming i9 XE
i9-7900x
32 gb of memory
ASUS ROG STRIX GeForce GTX 1080TI OC Edition

My graphic card is very long and it is blocking USB3_5_6. Can I install my graphic card on PCIE2? Will it affect the performance? If it does affect performance, what are my options? Thanks for your help.

Replies:

Posted By: sohleks
Date Posted: 27 Dec 2017 at 2:26pm

I've heard the performance difference is extremely minimal. Like 1%. And even then that might've been because they were testing a high end gpu like that in a 8x slot and your nice mobo like that would have two x16 slots. Current gen cards hardly max out on a pci gen 3 8x slots.

The largest difference would probably just be thermals IF it's like blowing hot air right against like a power supply shroud.

Posted By: PetrolHead
Date Posted: 27 Dec 2017 at 2:36pm

" rel="nofollow - Depending on your CPU (I don't know the specs of the i9-7900x), you might want to install it to PCIE3 instead. From your motherboard's manual:

4 x PCI Express 3.0 x16 Slots*

* If you install CPU with 44 lanes, PCIE1/PCIE2/PCIE3/PCIE5

will run at x16/x8/x16/x0 or x8/x8/x16/x8.

* If you install CPU with 28 lanes, PCIE1/PCIE2/PCIE3/PCIE5

will run at x16/x0/x8/x0 or x8/x0/x8/x8.

* If you install CPU with 16 lanes, PCIE1/PCIE2/PCIE3/PCIE5

will run at x16/x0/x0/x0 or x8/x0/x4/x0.

-------------
Ryzen 5 1500X, ASRock AB350M Pro4, 2x8 GB G.Skill Trident Z 3466CL16, Sapphire Pulse RX Vega56 8G HBM2, Corsair RM550x, Samsung 960 EVO SSD (NVMe) 250GB, Samsung 850 EVO SSD 500 GB, Windows 10 64-bit