Shared bandwidth, X870E Hero

[freddy8555]

Hi, I'm about to build a pc with X870E hero and AMD 9800X3D cpu

The shared bandwidth on the Pciex lanes is causing me some confusion.
I want to install 3 m2 SSD drives and keep the full 16x bandwidth of the pciex_1 slot.

Can i use m2_1, m2_2 and m2_4?
Or should i use m2_1, m2_4 and m2_5?

[Katana1074 · Accepted solution]

I have the x870e hero with 3 x m.2 drives,  as long as you use m2_1, m2_4 and m2_5 you will keep 16x bandwidth of the pciex_1 slot..

Regards

[UTVOL06]

I was commenting to say the same thing.  Only m.2_1 can be used for Gen5 SSDs and m.2_4 and m.2_5 for gen 4 ssds to prevent GPU x16 pcie lane from reducing bandwidth. I am personally just using a single Sabrent Rocket 5 (4TB) gen 5.0 SSD in the m.2_1 slot with excellent application and game loading performance. 

[Rewerend]

Hey Katana thank you I just found out I used m2_1 + m2_2 and m2_3 slots which gives me 8x bandwidth for gpu how I missed this picture in manual!

Thank you so much for that thread since I made it wrong  😑 See below from manual

[DarekGra]

but do you really need PCIe x16

[Katana1074]

Hey...

No worries glad to be of help, If you need to use a 4th m.2 drive, you can use the SAS port like I did :

[Rewerend]

Sure do! If you like almost 3 extra fps that's what is all about and considering if you just use pci lanes correctly. I am happy.

[ExcessiveGBH]

If you wanted to use the SLIM SAS port. these are the parts I used.

1 x Diliving PCIe Gen4 SlimSAS 4X to U.2 NVMe Adapter cable

1 x Vantec Multi-Size M.2 NVMe to U.2 (SFF-8639) 2.5"" SSD Adapter case