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GTX 980 SLI, Intel 5820k and bottlenecks

aur0n

I am upgrading my setup to Haswell/x99. My plan is to buy a GTX 980, Intel 5820k and, in the ner future, put another 980 to play games at 4K res.

 

I have read many articles about 5820k and its fewer PCIe lanes (28) compared to its big brothers (40 for 5930k and 5960x). My question is: for a dual SLI setup, this number of maximum lanes is it gonna bottleneck performances in a a noticeable way? Or is it noticeable only for 3-way or 4-way SLI configurations?

 

Thanks in advance.

 

 

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It makes little difference beside 1 or 2 FPS. I have a 5820K and three GTX 980. All running in 8x.

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I am upgrading my setup to Haswell/x99. My plan is to buy a GTX 980, Intel 5820k and, in the ner future, put another 980 to play games at 4K res.

 

I have read many articles about 5820k and its fewer PCIe lanes (28) compared to its big brothers (40 for 5930k and 5960x). My question is: for a dual SLI setup, this number of maximum lanes is it gonna bottleneck performances in a a noticeable way? Or is it noticeable only for 3-way or 4-way SLI configurations?

 

Thanks in advance.

It does not actually make a difference in fps. It does mean you won't be running 4 way sli. However you shouldn't be running more than 2 in the first place really. 

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I'm very happy with 4770k and just 1x980 MSI gaming. maybe there is something you want me to test ??  I only have 16PCI lanes with 4770k

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I am upgrading my setup to Haswell/x99. My plan is to buy a GTX 980, Intel 5820k and, in the ner future, put another 980 to play games at 4K res.

 

I have read many articles about 5820k and its fewer PCIe lanes (28) compared to its big brothers (40 for 5930k and 5960x). My question is: for a dual SLI setup, this number of maximum lanes is it gonna bottleneck performances in a a noticeable way? Or is it noticeable only for 3-way or 4-way SLI configurations?

Whether you run two or three cards they will be running in 8x mode. However they are PCIe 3.0 lanes, and PCIe 3.0 8x for each 980 is more then enough

"Rawr XD"

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Should be perfectly fine.

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  • 3 months later...

i have the setup you are describing and have had no issues at all, 980 asus strix in sli with 5820k, you will be fine. There is more technical detail i can provide but the sentence above kinda covers simply the jist of it :)

 

if you want me to test some stuff for you i can :)

 

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I have a 2500k, and nothing I've come across causes it to bottleneck other than my gpu.

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Whether you run two or three cards they will be running in 8x mode.

 

Not exactly true.  For 2-way SLI, my 5820k and ASUS Rampage V Extreme run the primary card at 16x and the second card at 8x.  If you go to three cards, they do have to run at 8x.

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i have the setup you are describing and have had no issues at all, 980 asus strix in sli with 5820k, you will be fine. There is more technical detail i can provide but the sentence above kinda covers simply the jist of it :)

 

if you want me to test some stuff for you i can :)

 

"i offer myself as tribute"

Don't necro threads that are over a month old. It is against CoC

"Rawr XD"

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As mentioned above especially with Linus' videos it's not a huge impact on performance. You can argue that at 3x/4x-way SLI it can be, but otherwise for 2-way nope. I use a 4770k + 2x 980's and I see no bottle-neck when running benchmarks or playing games.

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I run a 5820K and 980 Classy 3 way SLI. Runs fine 

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I works with up to three cards in PCIe 3.0 x8/x8/x8 just fine. A 2way SLI on with i7 5820K rocks! The only thing where you have to be careful if you want 3way SLI. Because some X99 don not support 3way SLI with a 5820K.

 

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For now, pci-e x8 have no impact on the fps with GPUs.

The problems you may encounter tho are :
-If you upgrade in a year or two for a new GPU, won't they "require" pci-e x16 for significant gains? As of now latest generations were about performance/cost, energy saving and features, rather than raw performance. What if in march green and red team release uber cards (for good price) that would need a pci-e x16 for good performances on high resolution for incoming games? That might be a problem.
-If in six months good nvme pci-e SSDs with nand technology (m2 or not) become really great and affordable (like 3/4x faster), won't you have problems, like you'd have to sacrifice one GPU, or some GPU bandwith for it?

These are the two biggest concerns you should have about the 5820k, but for now you should be good.

 

Personnally I think that haswell-e and 980s are ofc great (the greatest) but they aren't future proof at all.
The server derived procs bring little improvements and are mostly about features that aren't put to good use yet (like pci-e ssds, ddr4, ...).

295x2 is better than 2 980s in SLI for high resolution/multi display, that is also important, but none of nvidia or amd brings a "good" solution for high resolution for demanding games already as of now.

Go for cheaper parts (socket 1150 with 970) or wait a bit. But that's just my two cents

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