AM5 with 2 x16 pcie connections

[reverseslayer]

Is there an AM5 motherboard that supports  2 pcie x16 links at full bandwidth? Both links need only pcie gen 3 speeds. I see the platform has that many lanes available but I haven't found one with this configuration yet.

 

I just don't feel the need to purchase threadripper. Even though this generation is cheaper.

[BentleyOwen123]

nope, cant find one, even the msi godlike cant, only x8/x8, although it is pcie gen 5 if that helps

[reverseslayer]

I wish it did, but unfortunately mellanox pcie cards need the full width as per their design. Having any less drops performance like crazy.

[rippy4500]

No AM5 cpu/mobo has 32 lanes usable in that way. 2x8 is the maximum without stepping up to threadripper or something similar with more lanes.

[Electronics Wizardy]

8 minutes ago, reverseslayer said:

I wish it did, but unfortunately mellanox pcie cards need the full width as per their design. Having any less drops performance like crazy.

Can you get newer network cards? The newer genderations are gen 4/5 and will give you the same network speeds on x8.

[GuiltySpark_]

45 minutes ago, reverseslayer said:

Is there an AM5 motherboard that supports  2 pcie x16 links at full bandwidth?

Nope, doesn't exist. https://docs.google.com/spreadsheets/d/1NQHkDEcgDPm34Mns3C93K6SJoBnua-x9O-y_6hv8sPs/edit#gid=0

[GuiltySpark_]

21 minutes ago, reverseslayer said:

I wish it did, but unfortunately mellanox pcie cards need the full width as per their design. Having any less drops performance like crazy.

Link the card.

[reverseslayer]

1 hour ago, Electronics Wizardy said:

Can you get newer network cards? The newer genderations are gen 4/5 and will give you the same network speeds on x8.

For the amount of money I'd spend I think it be more worth getting a newer platform over network card.

But if your curious I'm running a connect x5 cx555a and a rx 7900xtx. The cx555a are kinda cheap on the used.

 

[LIGISTX]

3 hours ago, reverseslayer said:

connect x5 cx555a

What kind of networking are you trying to accomplish here…? What is connected on the other end that you can pull or send data to at connect x5 speeds? 
 

Unless my searches are just incorrect, isn’t that a 100gigabit NIC? If you have something on the other end that is even remotely able to serve or ingest data that fast, I don’t really know why your worried about the cost of going thread ripper.

 

Just put it in a x8 slot, a PCIe 3.0 x8 will still easily do 50 gigabit… 

 

What exactly is the use case here? 

[reverseslayer]

12 hours ago, Electronics Wizardy said:

Can you get newer network cards? The newer genderations are gen 4/5 and will give you the same network speeds on x8.

For the amount of money I'd spend I think it be more worth getting a newer platform over network card.

But if your curious I'm running a connect x5 cx555a and a rx 7900xtx. The cx555a are kinda cheap on the used.

 

[reverseslayer]

7 hours ago, LIGISTX said:

What kind of networking are you trying to accomplish here…? What is connected on the other end that you can pull or send data to at connect x5 speeds? 
 

Unless my searches are just incorrect, isn’t that a 100gigabit NIC? If you have something on the other end that is even remotely able to serve or ingest data that fast, I don’t really know why your worried about the cost of going thread ripper.

 

Just put it in a x8 slot, a PCIe 3.0 x8 will still easily do 50 gigabit… 

 

What exactly is the use case here? 

1. Yes there is a use case and no I cannot specify due to work contraints.

 

2. The problem is also that the 100Gbit nic shows up at 100Gbps but on an 8x link the real world throughput is only 10Gbps. The old Connect X 3 MCX354A-FCBT cards that we upgraded from were easily able to hit 35-36Gbps on an 8x link with no problem, so with the slower link speed on this new card is causing a problem.

[LIGISTX]

9 minutes ago, reverseslayer said:

work contraints

If this is for work and not homelab, the price of a proper mobo shouldn’t be much of a concern. If you really do need that speed, you probably do need to look at enterprise grade mono’s.