M.2 x4 SSD's ?

I'm still really confused by the motherboard manual stating that an m2 x4 will affect GPU performance. GPU needs 16 lanes, m2 needs 4 that leaves 8 not used... Why do I need 40 lanes?
 
Still though the 5820 supports 28 lanes, if you go sli 16+8=24 dont you have 4 more for the m.2? And still that is better than other processors that have 20 lanes support and have to break the sli to 8+8+4 lanes.
 
DavieJG & aposotlis I was attempting to word the same questions earlier, its still a bit unclear which is why I asked surely an 5820k/1GPU and an M2x4 would still have the bandwidth left over?

Or perhaps we are forgetting that sata or something else takes up some bandwith !

Starting to see a 5820K is pretty bandwidth crippled and the 5930k with 40 lanes would allow at least you to use your set up a fair lot better !

Oh on a side note I noticed some X99 mobos like the gigabyte boards do not have m2 4x support they max out at 10g while the asus ones mention they have 4x and 32g
 
Some mobos have 2 M.2 sockets so the 'theft' of PCI-E lanes would be even worse.

Didn't realise that the M.2 NGFF on my MSI Z97 would disable 2 of the SATA ports either, until I read the ****** manual LOL. It's only got 6 altogether! :eek: Like an idiot I assumed the M.2 was in addition to everything else rather than subtracting from the SATA & PCI-E availability.

Not a huge deal but worth looking out for in future I think...
 
R3X said:
DavieJG & aposotlis I was attempting to word the same questions earlier, its still a bit unclear which is why I asked surely an 5820k/1GPU and an M2x4 would still have the bandwidth left over?

Or perhaps we are forgetting that sata or something else takes up some bandwith !

Starting to see a 5820K is pretty bandwidth crippled and the 5930k with 40 lanes would allow at least you to use your set up a fair lot better !

Oh on a side note I noticed some X99 mobos like the gigabyte boards do not have m2 4x support they max out at 10g while the asus ones mention they have 4x and 32g
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I still think it will be better than having a mainstream processor. Is there a source somewhere that explains what else is using these lanes?
 
Not sure about any source tbh not really sure how the plumbing works out with bandwith perhaps sata ports and sata express can also eat into that bandwith?

Otherwise why is the M2 slot making sata ports not usable ?

But I do agree with your maths on 5820k and say SLI/Crossfire and 16x/8x config and still having a 4x (out of 28 lanes) being available, only reason why I can think that motherboard manufacturers are adding that disclaimer in the manual is something else may be using up the bandwith just like a sata drive or sata express drive.

It hurts my head even considering it ! which is why I like the 5930k with 40 lanes.
 
Indeed but how do the mainstream processors work this with 20 lanes? Only thing i can think is different is that the z97 mobos support only m.2 x2 with only the asrock extreme supporting the m.2 x4
 
Yeah thats the confusing part 4770/4790k is 16 lanes so surely that would mean 1 single PCI 3.0 GPU would take all that bandwith up ?

But then obviously one can't have sata slots or m.2 devices switch off! perhaps it does use some of the pci lanes bandwidth up or when it only requires too.

Interesting about the m.2 x4 on Z97 extreme asrock board I digged into the manual to see it they mention about any other pci lane bandwith loss but not really mentioned anything with the m.2 x4 slot only the other m2 x2 slot mentions 4x bandwidth is lost.

Perhaps given the nature of all this bandwidth and since not much difference anyhow perhaps any 4790k/z97 or 5820/5930k/x99 solution is still fine for now at least! If one does not wish to chance anything 5930k is £110-130 more then 5820 :)
 
R3X said:
Not sure about any source tbh not really sure how the plumbing works out with bandwith perhaps sata ports and sata express can also eat into that bandwith?

Otherwise why is the M2 slot making sata ports not usable ?

But I do agree with your maths on 5820k and say SLI/Crossfire and 16x/8x config and still having a 4x (out of 28 lanes) being available, only reason why I can think that motherboard manufacturers are adding that disclaimer in the manual is something else may be using up the bandwith just like a sata drive or sata express drive.

It hurts my head even considering it ! which is why I like the 5930k with 40 lanes.
Click to expand...

The other hardware using pcie lanes is the nic. You need a board with a PLX chip which expands the number of lanes available.
 
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