Is pcie 1x a bottleneck to a gigabit Ethernet port

[Spudwell06]

I was looking at a single port 1000 mb/s network adapter, but I only have a pcie 1x slot

Would pcie 1x be a bottleneck or not?

[Master Disaster]

Yep, PCIe 1x has a max throughput of 250MBpS in each direction. You need at least 4x for Gigabit.

[mariushm]

No.

 

Gigabit ethernet is 1gbps or 125 MB/s 

 

1 pci-e lane is : 

pci-e 1.0 is 250 MB/s 

pci-e 2.0 is 500 MB/s

pci-e 3.0 is 985 MB/s 

pci-e 4.0 is 2 x 985 MB/s 

 

So even the most ancient, slowest pci-e x1 slot would have twice as much bandwidth as a gigabit network card would need.

 

Even on old PCI, it wasn't really a big deal.  Standard PCI 32 bit 33 Mhz had a maximum of 133 MB/s shared between all PCI devices. You could still get 110-120 MB/s just fine.

[Moonzy]

5 minutes ago, Master Disaster said:

Yep, PCIe 1x has a max throughput of 250MBpS in each direction. You need at least 4x for Gigabit.

gigabyte and gigabit

 

also depends on PCIE gen

PCIE 4.0 has almost 2 gigabyte per second bandwidth on x1 lane

[Master Disaster]

3 minutes ago, mariushm said:

No.

 

Gigabit ethernet is 1gbps or 125 MB/s 

 

1 pci-e lane is : 

pci-e 1.0 is 250 MB/s 

pci-e 2.0 is 500 MB/s

pci-e 3.0 is 985 MB/s 

pci-e 4.0 is 2 x 985 MB/s 

 

So even the most ancient, slowest pci-e x1 slot would have twice as much bandwidth as a gigabit network card would need.

 

Even on old PCI, it wasn't really a big deal.  Standard PCI 32 bit 33 Mhz had a maximum of 133 MB/s shared between all PCI devices. You could still get 110-120 MB/s just fine.

D'oh, you're right. For whatever reason I read Gigabit but my brain registered it as Gigabyte. Haven't had my morning coffee yet (that's my excuse and I'm sticking to it)

[Archer42]

7 minutes ago, Master Disaster said:

Yep, PCIe 1x has a max throughput of 250MBpS in each direction. You need at least 4x for Gigabit.

You confused bytes with bits.

1Gb/s is 128MB/s, so no, pci-e x1, even 1.0, is not even close to being a bottleneck.

[mariushm]

1 minute ago, Archer42 said:

You confused bytes with bits.

1Gb is 128MB/s, so no, pci-e x1, even 1.0, is not even close to being a bottleneck.

It's 1 gbps or  1,000,000,000 bits  or 125,000,000 bytes.  That's 125 MB/s ( /1000)  or  119.2 MiB/s  (/1024)

 

Math is hard.

[Archer42]

6 minutes ago, mariushm said:

Math is hard.

Well, yeah, 125. Should think a bit more before typing

Also never got used to binary units being renamed to GiB, MiB and such, especially since windows still continues to call them GB and MB and most people continue calling them GB and MB too, as a result.

[Spudwell06]

Cool! I can use my pcie 3.0 1x slot to have a full 1000mb/s

 

Thanks for all the information!

[Sir Asvald]

4 hours ago, Master Disaster said:

Haven't had my morning coffee yet (that's my excuse and I'm sticking to it)

My excuse is that the coffee has not processed yet. So, please come back in a hour or so...or I will be crazy