Supermicro & E3-1245 v3 = 16 max PCI Express Lanes?

[foxhunt]

I have a Supermicro X10SAT motherboard with a E3-1245 v3. I am running 2 PCIe x8 9210-8i SAS controller cards and would like to add a PCIe x8 10Gbe SFP+ Intel card. I've never ran into a PCIe limitation.

E3-1245 v3 says "Max # of PCI Express Lanes is 16"
https://ark.intel.com/products/75462/Intel-Xeon-Processor-E3-1245-v3-8M-Cache-3_40-GHz

Supermicro X10SAT says "3x PCI-E 3.0 x16 slots and 3x PCI-E 2.0 x1 (in x4) slots"
https://www.supermicro.com/products/motherboard/Xeon/C220/X10SAT.cfm

This is a freenas box. Any suggestions or do I need to upgrade?

 

[Denpepe]

From the looks of it if they need to be x8 you are out of luck, if you use all 3 x16 slot's it runs at x8/x4/x4.

 

[foxhunt]

From the looks of it if they need to be x8 you are out of luck, if you use all 3 x16 slot's it runs at x8/x4/x4.

Thanks for confirming how it splits up the PCIe lanes. My next build I'll keep this in mind.

Looks like the least expensive step would be for me to switch to a 16 port x8 HBA instead of using 2 8 port x8 HBA. Stupid how the E5 Xeons have 40 lanes when I don't need that much of a processor especially considering the wattage.

 

[Denpepe]

Thanks for confirming how it splits up the PCIe lanes. My next build I'll keep this in mind.

Looks like the least expensive step would be for me to switch to a 16 port x8 HBA instead of using 2 8 port x8 HBA. Stupid how the E5 Xeons have 40 lanes when I don't need that much of a processor especially considering the wattage.

I know there are some mainstream boards that have PCIe slots going trought he PCH chip and as such can circumvent some of the restrictions imposed by intel regarding to lanes, not sure if there are boards for you like that around though.