[SOLVED] PCI-E Lanes 16/16/8

[Abrekiz]

I'm shopping for a motherboard in the LGA2066 family, thinking of getting the I9-10900X. However, that processor supports 48-lane PCI-E... but I can't seem to find any motherboards that offer 3 x PCI-E running @ x16... For example, I'm looking at the X299 XPOWER GAMING AC, it shows that the most it does is 16/0/16/8.

The only reason I care, is because if I decide tomorrow to put 3 video cards in there with SLI (not looking to discuss the pro and cons of SLI atm), then all 3 cards would run at x8, because it can only do the lowest of the 3...right? What am I missing?? Can someone please enlighten me?

Thanks to everyone who takes the time to read this!

 

[rgd1101]

it mean it run 2 at 16 and 1 at 8

 

[Abrekiz]

Yup, I get that part. But since the CPUI has 48 lanes, shouldn't there be at least 1 mobo out there that support 3 x16 ?

 

[rgd1101]

it use some for connection to the chipset and ram. so no.

 

[Abrekiz]

AHA! so the lanes are not dedicated to PCI-E, they are shared with the chipset and ram...

And what about the part of the slowest PCI-E will throttle back the others in an SLI config will be the speed for all (might need to re-post in v-card section), is that information accurate?

 

[rgd1101]

AHA! so the lanes are not dedicated to PCI-E, they are shared with the chipset and ram...

And what about the part of the slowest PCI-E will throttle back the others in an SLI config will be the speed for all (might need to re-post in v-card section), is that information accurate?

each gpu will run at their slot speed

 

[Abrekiz]

@rgd1101 Thanks for the quick responses!