If you have cashback or another ebay discount today here is a dual 25GbE Mezzanine option for what looks to be decent price. From the pictures, they look like they are OCP cards but there is little information on these making them only a potential deal:
BCM957304M3040C NetXtreme® C-Series Dual-Port 25G Network Adapter Card | eBay
Many server vendors companies either have or are moving to OCP mezzanine cards, so this may be a great opportunity to pick up cheap 25GbE compatible cards.
Here are single port 10GbE OCP mezzanine cards if you want to look at mounting holes to help guide decisions Intel Network Card X520DA2OCP Ethernet Server Adapter 801940477644 | eBay
Mellanox ConnectX-3 10 GigaBit SFP+ Network Adapter MCX341A-XCAN | eBay
Even the 10GbE ones (especially the $20 Mellanox single port) may be useful if you are buying a newer server. Supermicro does not support OCP mezzanine cards, but Tyan, Gigabyte Server, ASRock Rack, ASUS, some Dell EMC servers, QCT, Inspur and others are supporting OCP.
BCM957304M3040C NetXtreme® C-Series Dual-Port 25G Network Adapter Card | eBay
Many server vendors companies either have or are moving to OCP mezzanine cards, so this may be a great opportunity to pick up cheap 25GbE compatible cards.
Here are single port 10GbE OCP mezzanine cards if you want to look at mounting holes to help guide decisions Intel Network Card X520DA2OCP Ethernet Server Adapter 801940477644 | eBay
Mellanox ConnectX-3 10 GigaBit SFP+ Network Adapter MCX341A-XCAN | eBay
Even the 10GbE ones (especially the $20 Mellanox single port) may be useful if you are buying a newer server. Supermicro does not support OCP mezzanine cards, but Tyan, Gigabyte Server, ASRock Rack, ASUS, some Dell EMC servers, QCT, Inspur and others are supporting OCP.
