Upgrading to 10gbe
There's lots of used / new old stock 10gbps cards out there, for cheap, under 70$
Look for x520 based cards for example, single port cards start from around 33$, here's an example : https://www.ebay.com/itm/131847037922 or another example : https://www.ebay.com/itm/292072484816
2 port cards from around 50-60$, here's an example : https://www.ebay.com/itm/144716011844
or another https://www.ebay.com/itm/142146627614 or another https://www.ebay.com/itm/165289540157 or another
Another alternative would be the Solarflare cards ... the company was bought by Xilinx so they're no longer sold, and some models are quite cheap these days. But stick to 7th and 8th generation for drivers and firmware updates. Drivers are still available here : https://www.xilinx.com/support/download/nic-software-and-drivers.html#sfn5000-8000
For example an ebay seller sells SFN7122F 2 port x 10g sfp+ for $20 each (plus 19$ shipping to Canada) : https://www.ebay.com/itm/304643386227
or this deal for $20 for SFN7120 plus two transceivers (plus $23 shipping) : https://www.ebay.com/itm/256021324011
You can get high profile brackets for 5$ https://www.ebay.com/itm/394055344847
For RJ45 (regular ethernet cables), you could spend $60-70 on x540-T2 , dual port 10g cards :
example : https://www.ebay.com/itm/374565197595
or https://www.ebay.com/itm/143592056280
(note these cards won't support 2.5g and 5g but they're so cheap you could just add 10g cards in all your machines)
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