Question ASUS ROG Strix B450-F Gaming motherboard specifies VGA config for single card where PCIE_X16_1 says 16X while PCIE_X16 says N/A, does it run as 16X?

Jul 29, 2019
2
0
10
0
The motherboard specifies VGA configuration for single card where PCIE_X16_1 is running on 16X while PCIE_X16_2 says N/A, does N/A represent the same 16X speed if I place my GPU there? The motherboard in question is an ASUS ROG Strix B450-F GAMING.
 
If PCIE_X16_1 is set for x16 mode. PCIE_X16_2 is N/A (not available) and M.2_2 is N/A.
If PCIE_X16_1 is set for x8 mode. PCIE_X16_2 will operate in x4 mode and M.2_2 operates in x4 mode. x4 mode is the fastest option for PCIE_X16_2 as it shares x4 lanes with the M.2_2. There is no option for it to work in x16 or x8 mode.
 

WaltzWorker

Reputable
Mar 18, 2015
156
15
4,715
17
No! This MB as with some boards (via the chipsets which are below the X570 [I think] ) share PCI lanes... This one seems to share PCIE_X16_2 with the M.2_2 connection AND SATA ports 5 & 6!!! So... If you have your GPU in PCI_X16_1 (slot one) then if you want it to run in X16 mode you can't put anything in PCIE_X16_2 slot. IF You Do - then the GPU will drop to X8, the 2nd slot will run at X4... M2_2 will be run but at X4 because of the sharing of PCI lanes. M.2_1 will be supported and depending upon the mode it runs will be X4 or will be supported/will run. IF you had an older CPU - the M.2_2 slot would be totally disabled if you have your GPU in X16_1 and an M.2 drive in M.2_1. and would not support anything in M.2_2. So then.. IF you place your GPU in PCIE_X16_2 your system will think you have a dual GPU setup... I'm not sure if it will run like that... Although it would run at X4 and expecting the first slot PCIE_X16_1 to run at X8.... Not sure your MB can run Please note manual page ix under "Storage": "-M.2_1 socket 3 with M key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support" which leads to: " When M.2_1 Socket 3 is operating in SATA or PCIE mode, SATA6G_5/6 ports will be disabled." This means that if you use M.2_1 You will also loose SATA6G_5 & SATA6G_6 physical sata ports on the motherboard as well.
 
Reactions: Warguard
Jul 29, 2019
2
0
10
0
Thank you all so much for the answers and clarification.

I gues that confirms it as I tried putting the GPU in the PCIE_X16_2 slot while PCIE_X16_1, PCIE_X16_3 and M.2_2 are vacant and somehow managed to have GPU-Z report it within the bus interface field as PCIE X16 3.0 @ X4 1.1 (even if I set NB for PCIE_X16_2 manually to GEN 3 it still shows 1.1).
 

ASK THE COMMUNITY

TRENDING THREADS