CPU and MB PCIe Lane Question 2x16???

[Sasqui]

I'm sure someone knows the answer to this, and @Xx Tek Tip xX was having a problem running any PCIe card at x16 in thier rig.

So, the way I read it, my 4790k CPU only supports 1 x16 PCIe lane according to intel https://ark.intel.com/products/80807/Intel-Core-i7-4790K-Processor-8M-Cache-up-to-4-40-GHz-

...or is that 1x16 + 2x8 + 2x4??

My MSI z97 U# Plus board says it supports 2 x16 PCIe cards. I'm confused, lol

 

[dorsetknob]

Supports 1 Card at PCIx16 or 2 cards at PCIx8 or 1 card at PCI8x + 2 at PCIx4

 

[Deleted member 178884]

Thanks for the tag,
My question : Why did msi not allow x16 on one gpu? Yet other board manufacturers allowed x16 on a 7740x

 

[Sasqui]

Supports 1 Card at PCI16x or 2 cards at PCI8x or 1 card at PCI8x + 2 at PCIx4

What 4 series CPUs have more than 16 PCIe lanes?

My question : Why did msi not allow x16 on one gpu? Yet other board manufacturers allowed x16 on a 7740x

Hey, did you check any other X299 boards to see if they have the same restriction?

My Vega 64 runs at x16 according to GPUz. I assume if I plug any other PCIe devices in it'll drop to x8 or x4

 

[Deleted member 178884]

Hey, did you check any other X299 boards to see if they have the same restriction?

My Vega 64 runs at x16 according to GPUz. I assume if I plug any other PCIe devices in it'll drop to x8 or x4

X299 mark 2 allows x16 hang up

What 4 series CPUs have more than 16 PCIe lanes?

According to overclock.net - none.
https://www.overclock.net/forum/8-i...-lga-1150-pci-express-max-lanes-question.html

What 4 series CPUs have more than 16 PCIe lanes?

Sounds to me like the only fix is changing platforms, crazy. The only platform with plenty of lanes is the threadripper platform. (64 from the cpu)

 

[newtekie1]

My Vega 64 runs at x16 according to GPUz. I assume if I plug any other PCIe devices in it'll drop to x8 or x4

With your Z97 U3 Plus, if you plug anything into the 2nd blue PCI-E slot, then the main slot with your Vega will run at x8. If you plug anything into the black PCI-E slots, the main slot will stay at x16.

There are Z97 boards that provide more slots, that don't pull from the main one, but for some reason MSI put a stupid amount of regular old school PCI slots on that board...

 

[Deleted member 178884]

Try what newtekie1 said first, in regards to upgrades (although it's not worth it really):
With intel your limited, to the HEDT. Both the 8700k and 9900k run the same lane configuration as that 4790k you have, Your option is HEDT unless ryzen's 2700x is enough, it has 20 PCI lanes usable.

 

[newtekie1]

Your option is HEDT unless ryzen's 2700x is enough, it has 20 PCI lanes usable.

Even Ryzen isn't really an option because the extra 4 lanes are dedicated to the M.2 slot on Ryzen boards. So you don't really get to use those extra lanes for expansion cards, except maybe on a very few rare motherboards that don't have an M.2 slot.

If you want more PCI-E lane and don't want to fork out the cash for HEDT, Intel's platform is definitely the way to go. As long as you aren't using those lanes for graphics.

 

[Deleted member 178884]

Even Ryzen isn't really an option because the extra 4 lanes are dedicated to the M.2 slot on Ryzen boards. So you don't really get to use those extra lanes for expansion cards, except maybe on a very few rare motherboards that don't have an M.2 slot.

Yeah forget he mentioned x16 by 2 which adds up to 32 lanes required, HEDT is the only thing that will provide that.