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They said the same thing about 40G but hey, I've loved it for bridging the gap between my two (10G and 100G, respectively) Mikrotik switches. You can have a doz
by tucnak 11mo ago
They said the same thing about 40G but hey, I've loved it for bridging the gap between my two (10G and 100G, respectively) Mikrotik switches. You can have a dozen Gigabit ports, as well as up to four true 10G devices on your aggregation switch, and neither would be bottlenecked by traffic to and from the backside. This has been a massive boon. However, when it comes to 2.5G, I struggle to find one good reason to use it; such a tiny step-up in bandwidth, and for what?
- JoshTriplett 11mo ago> However, when it comes to 2.5G, I struggle to find one good reason to use it; such a tiny step-up in bandwidth, and for what? Portability and heat. You can get a small USB 2.5G adapter that produces negligible heat, but a Thunderbolt 10G adapter is large and produces a substantial amount of heat. I use 10G at home, but the adapter I throw into my laptop bag is a tiny 2.5G adapter.
- johncolanduoni 11mo agoI’m sure it depends on the model, but in my experience if you force a 10G copper transceiver to 2.5G the insane heat generation goes away. I don’t have any Thunderbolt 10G adapters, but I’m kind of surprised they’re much larger. A SFP+ transceiver is the same size as a SFP one.
- JoshTriplett 11mo agoI think a major reason for the size is for heat dissipation, because it has to be prepared to handle the heat of a full 10G copper connection. Mine runs hot.
- 0x457 11mo agoMost of my cables coming out of the aggregation switch are DAC and fiber, but there is no 10G copper because my PC came with 10G copper NIC integrated. Anyway, the difference in heat between this transceiver is shockingly large. I knew it runs hot before I deployed it, but I wasn't aware that you have to wait for it to cooldown before unplugging, or you get burnt.
- fulafel 11mo agoThe power has come down a lot and drops in shorter runs, from ~15w per port at the max 100M cable length back in 2006, to ~2w with todays tech and short cable run. There's of course fiber too...
- johncolanduoni 11mo ago40G on Mikrotik is just channel bonding of 4 10G links at layer 2. It’s not like the vast majority of 100G that does layer 1 bonding. I really don’t know why they did it other than to have a bigger number on the spec sheet - I can’t imagine they save any money having a weird MAC setup almost nobody else uses on a few low-volume models.
- u8080 11mo ago1x PCIE 3.0 has 8 Gbps raw speed - for 2.5Gbps duplex Ethernet you'll need 6~7 Gbps of raw link to CPU. For 5Gbps and higher, you'll need another PCIE line - and SOHO motherboards are usually already pretty tight on PCIE lanes. 10GbE will require 4x3.0 lanes
- johncolanduoni 11mo agoAre motherboards commonly using PCIe 3.0 for onboard peripherals these days? I wouldn’t expect it to save them much money, but my PCIe knowledge is constrained to the application layer - I know next to nothing about the PHY or associated costs.
- u8080 11mo agoYes, i.e. https://tech4gamers.com/wp-content/uploads/2022/10/B650-AORUS-ELITE-AX-Block-Diagram-896x1024.jpg https://tech4gamers.com/wp-content/uploads/2022/10/B650-AORU...
- tucnak 11mo agoThis is got to be it!
- fulafel 11mo agoPCIe is full duplex. And there's no requirement for ethernet ports to be able to do full tilt. Even with a 1x PCIe 3.0, a 10G port will be much much better than a 2.5G one. (But PCIe 3.0 of course is from 2010 and isn't too relevant today - 4.0, 5.0, 6.0 and 7.0 have 16/32/64/128 Gbps per lane respectively)
- u8080 11mo agoIt is relevant, SOHO boards still use PCIE 3.0 to attach NICs, i.e. https://tech4gamers.com/wp-content/uploads/2022/10/B650-AORUS-ELITE-AX-Block-Diagram-896x1024.jpg https://tech4gamers.com/wp-content/uploads/2022/10/B650-AORU... Agree that 10G would be still better, but OEMs couldn't write 10G on their hw while it is capped to 7Gb
- 11mo ago