While laying out a new system, it's come to my realization that I don't have as much of an understanding on PCI-E bandwidth as I thought I did.
I'm looking at a Z690 based motherboard to build a new machine off of. It has 1 x16 PCIe 5.0, 2 x16 PCIe 3.0 and 1 x1 PCIe 3.0 slots (the x1 is not open ended). Unfortunately, the two x16 3.0 slots are limited to x1 and x4 according to the specs.
I have a X520-SR2 dual 10gbe (PCIe 2.0 x8), a IBM M5110 (LSI 2303, PCIe 3.0 x8) and a LSI 9207 (PCIe 3.0 x8) for this machine.
I'm having trouble wrapping my head around the difference between GT/s and GB/s. The 2.0 spec is 5GT/s per lane, which an online calculator shows to be 40GB/sec, but even a x16 can only do 8GB/sec throughput according to the table I'm looking at here. I'm confused at the correlation.
Ultimately I'm trying to figure out how hosed I am on bandwidth on the board. I *think* my best option is to put the M5110 in the x16 5.0 slot (internal drive array, fast disks), the X520 in the x16/x4 slot (I'd like to get the full 10gbe out of it) and the 9207-8e in the x16/x1 slot? I'm not thrilled at the idea, but the external drive shelfs house pretty slow 2.5" SMR drives, so at the end of the day it's not going to need a ton of bandwidth in the first place.
Guidance would be great
I'm looking at a Z690 based motherboard to build a new machine off of. It has 1 x16 PCIe 5.0, 2 x16 PCIe 3.0 and 1 x1 PCIe 3.0 slots (the x1 is not open ended). Unfortunately, the two x16 3.0 slots are limited to x1 and x4 according to the specs.
I have a X520-SR2 dual 10gbe (PCIe 2.0 x8), a IBM M5110 (LSI 2303, PCIe 3.0 x8) and a LSI 9207 (PCIe 3.0 x8) for this machine.
I'm having trouble wrapping my head around the difference between GT/s and GB/s. The 2.0 spec is 5GT/s per lane, which an online calculator shows to be 40GB/sec, but even a x16 can only do 8GB/sec throughput according to the table I'm looking at here. I'm confused at the correlation.
Ultimately I'm trying to figure out how hosed I am on bandwidth on the board. I *think* my best option is to put the M5110 in the x16 5.0 slot (internal drive array, fast disks), the X520 in the x16/x4 slot (I'd like to get the full 10gbe out of it) and the 9207-8e in the x16/x1 slot? I'm not thrilled at the idea, but the external drive shelfs house pretty slow 2.5" SMR drives, so at the end of the day it's not going to need a ton of bandwidth in the first place.
Guidance would be great