I would like to know if this card can work and I have a 10g switch that supports link aggregation https://www.amazon.co.uk/8X10G-SFP-Multi-Gigabit-Managed-Aggregation/dp/B0DXPFB4QM?th=1

So I would like to know if I can run a 40gb Nic via breakout cables into this switch or would it be waste or would it be better to just get a card that has 4 10gb slots

Yes pcie 3.0 x 8 supports.

If you want 40Gbps, get both switch and card that support it. Setting yourself up for disappointment trying to aggregate multiple lines into one.

What do you think is the best I can expect with that current setup and I’ll look at getting a faster switch later but as I currently have this switch want to know what I can expect for now

I can't say. I would like to think speeds would at least get above the 10Gbps of an individual port, but it's going to depend almost entirely on how well that switch multiplex/demultiplex the data.

4x10g wont immediately make your normal, single client SMB transfers faster than 1x10gbit, but hitting the server with multiple streams at once will be faster, if you have multiple 10gbe or faster clients hitting the server then you will definitely see improvements under load.

there is some tuning you can do for SMB multichannel and other SMB3 optimizations to further improve it if you have a client PC connected with 4x10gbe as well, but it's never going to be perfect other than for specific, parallel transfers..

that's part of the reason I went with 25gbe instead of 40gbe, it's easier since it is a single 25gbe channel, not 4x10gbe channels you need to distribute the load over.

yeah basically at the moment I have two clients that are limited by 10gbps and it would cost a lot to get those devices to 25gbe as they're Macs, however there is a window client that in future plan to upgrade to 25gbe but for now 10gbe is fine but that is the one thats currently one 1gbe so ideally if I had 4 ports going to the switch and each of those clients can pull 10gbe down to themselves each I will be happy for the time being

On 6/14/2025 at 6:35 PM, Veah said:

Yes pcie 3.0 x 8 supports.

If you want 40Gbps, get both switch and card that support it. Setting yourself up for disappointment trying to aggregate multiple lines into one.

Actually im looking at a 10gb card with 4 ports

https://www.amazon.co.uk/Network-X710-DA4-XL710-AM1-Chipset-Ethernet/dp/B07WFC25PT/ref=sr_1_1?crid=IVQ25VY7C6F0&dib=eyJ2IjoiMSJ9.hvtsIEoZB8_GmgDk7vpPieS8cb9hp3opUNXVlnuBfnDGBKgt7_TarKxft0FtejdRaSREbiNBYaAh36WjqKGZqdpR3HTF9a9oT6rPHPiPvHH5WRd2itY6l7G2hMeBXZYa.MX3r8R_DPtWerBbmDc4l9MtWtQHxpn9ub2HXUgz-FrI&dib_tag=se&keywords=Intel%2BXL710-BM1&qid=1750026132&sprefix=intel%2Bxl710-bm1%2Caps%2C95&sr=8-1&th=1

Couple posts here that explain better what I think you are asking about. Instead of this guy's 2x1Gb nic, you are asking about 4x10Gb.

On 6/15/2025 at 5:16 AM, Myriad Studios LDN said:

yeah basically at the moment I have two clients that are limited by 10gbps and it would cost a lot to get those devices to 25gbe as they're Macs, however there is a window client that in future plan to upgrade to 25gbe but for now 10gbe is fine but that is the one thats currently one 1gbe so ideally if I had 4 ports going to the switch and each of those clients can pull 10gbe down to themselves each I will be happy for the time being

If you are ok with preowned then 40gig will be much cheaper than 25gb. Mellanox 40gb card for windows $15, XL710 40gb for mac $60, Juniper 4300 switch $120 with 24 1gb POE, 4 SFP+ 10gb and 4 QSFP+ 40gb. This is how I upgraded my 10gb lan when I started saturating it. Very glad I bypassed 25gb.