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m.2 A slot and pci-e x16 configuration once again

ztgst
Level 8

So this time with Asus ROG Strix Z790-i Gaming WiFi Motherboard the things gets even trickier

This mobo has 2 of m.2 slots, first of whitch marked as 5.0 and lanes goes from cpu directly, 

but the drive installed in A slot only does pcie 4.0 

VGA adapter is 4070ti and runs 8x4, when m.2 A slot not empty

Is there an option to switch lanes of A m.2 slot to PCH and let VGA have all its lanes?

According this review here is some kind of switching but no further detail revealed

https://www.youtube.com/watch?v=hnXIn2sRVZo

PS same goes for apex encore, when m.2 installed in A slot even if its not pcie 5.0 capable, then VGA goes x8. Is it also switchable setup? Thanx in advance

 

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1 REPLY 1

JohnAb
Level 17

Not familiar with your board, but a lot of boards do reduce the GPU to x8 when M.2_1 is used. I don't believe there's any way around it, but remember that a GPU on x8 will perform nearly as well, because not all lanes are used anyway. You might only see a 3-5% reduction in speed, so nothing like as bad as it seems. 

Z690 Hero, 12900K, BIOS 3603, MEI 2407.6.1.0, ME Firmware 16.1.32.2418, 7000X Case, RM1000x PSU, ASUS TUF OC 3090TI, 2 x 16GB Corsair RAM @ 5200MHz, Windows 11 Pro 23H2, Corsair H150i Elite AIO, 4x Corsair RGB fans, 3x M.2 NVME drives, 2x SATA SSDs, 2x SATA HDs.