need motherboard for i7 700k and SLI x16x16 (1080ti)

[Frey]

hello, i need a motherboard with x16x16 for i7 700k, my motherboard has only SLI x8x8

[Omega]

Messaggio originale di tacoshy:

Messaggio originale di Omega:

he did it because he is an enthousiast, not because having two GPUs running in X16 makes him happy.

ask him... he would have gone with another CPU he picked the i9 specifically to have 32+ lanes.

Yes that is always one of the reasons people buy these things. Excuses I say. You don't need the lanes.

Why did you buy it? ->"It has this one feature I never use and don't need"

The main reason he bought it is for the bragging rights of owning one of the most expensive enthusiast CPUs available. Same reason you want to buy one.

[Frey]

so do you think I can stay with x8x8 ?
i play at 4K

[Omega]

Messaggio originale di Koly™:

so do you think I can stay with x8x8 ?
i play at 4K

If you switch to x16 x2 you will only lose performance due the the ultra high-end hardware being less capable at gaming then what you currently have.

x8 vs x16 doesn't make any difference in performance, 1fps at most.

[Frey]

Messaggio originale di Omega:

Messaggio originale di Koly™:

so do you think I can stay with x8x8 ?
i play at 4K

If you switch to x16 x2 you will only lose performance due the the ultra high-end hardware being less capable at gaming then what you currently have.

x8 vs x16 doesn't make any difference in performance, 1fps at most.

ok thanks

[Monk]

Yeah I wanted the pcie lanes, some info had suggested it would make a difference, seems I was mistaken, however I also wanted them to run nvme drives, I'm pretty sure that the 1080ti's are very close to the limit of x8, but evidence does suggest it's not there yet.

I would point out to the op however to ask if he REALLY needs / wants sli, as it does make little actual sense.

[Revelene]

Messaggio originale di Koly™:

so do you think I can stay with x8x8 ?
i play at 4K

The frame difference will be minimal.

GamersNexus did an article about this topic, but with a Titan V.

https://www.gamersnexus.net/guides/3176-dual-titan-v-bandwidth-limit-test-x8-vs-x16

Considering that the Titan V is more powerful than the 1080 Ti, and that the overall performance difference with the Titan V with x8 vs x16 was about 13%... the difference for the 1080 Ti would be less, insignificant, and not worth the price of an enthusiast grade cpu upgrade.

[TehSpoopyKitteh]

Messaggio originale di Koly™:

hello, i need a motherboard with x16x16 for i7 700k, my motherboard has only SLI x8x8

Technically speaking, you'll want a motherboard that has 32 lanes of PCIe in total. If you're using 2x SLI, you'll be still using 16 lanes (8 lanes each). With 4x SLI, you would be using 4 PCIe lanes each.

An upgraded bios on an Asrock Z170 Extreme 7+ should suffice for what you are looking for. If not, just use PCPartPicker's "Build a System" feature to figure out and filter your motherboard options. Make sure it's a z270 chipset...

[Frey]

i dont really understand but x16x16 is probably better.

[Omega]

Messaggio originale di Koly™:

i dont really understand but x16x16 is probably better.

Not for your use case.

Messaggio originale di The Spoopy Kitteh:

Messaggio originale di Koly™:

hello, i need a motherboard with x16x16 for i7 700k, my motherboard has only SLI x8x8

Technically speaking, you'll want a motherboard that has 32 lanes of PCIe in total. If you're using 2x SLI, you'll be still using 16 lanes (8 lanes each). With 4x SLI, you would be using 4 PCIe lanes each.

An upgraded bios on an Asrock Z170 Extreme 7+ should suffice for what you are looking for. If not, just use PCPartPicker's "Build a System" feature to figure out and filter your motherboard options. Make sure it's a z270 chipset...

No 1151 mobo has enough lanes for true x16 x2.

And BIOS updates will not add lanes to a mobo.

[TehSpoopyKitteh]

Messaggio originale di Omega:

Messaggio originale di Koly™:

i dont really understand but x16x16 is probably better.

Not for your use case.

Messaggio originale di The Spoopy Kitteh:

Technically speaking, you'll want a motherboard that has 32 lanes of PCIe in total. If you're using 2x SLI, you'll be still using 16 lanes (8 lanes each). With 4x SLI, you would be using 4 PCIe lanes each.

An upgraded bios on an Asrock Z170 Extreme 7+ should suffice for what you are looking for. If not, just use PCPartPicker's "Build a System" feature to figure out and filter your motherboard options. Make sure it's a z270 chipset...

No 1151 mobo has enough lanes for true x16 x2.

And BIOS updates will not add lanes to a mobo.

It won't add lanes to a motherboard...I'm talking about the CPU the OP wants regarding that...And I did mention that the OP would still only be using 8 lanes per video card with 2 of them in there if there were a total of 32 lanes on the motherboard available.

[tacoshy]

the OP already has a CPU... he also has a Z270 Motherboard? Why going for another Motherboard or even worse an odler motherboard. Just meaningless information that has no relevance to the OP's issue.

[Monk]

Right now running a pair of 1080ti's on a 7700k on a regular z270 board at x8 and x8 is fine, I was mistaken about that, however, it seems that the 1080ti will likely be the last top end card you can sli on x8 (titan V has shown issues I believe)
So for now I would just use what you have and worry about a new motherboard and CPU when you make the next upgrade.

If however you really want more pcie lanes, then prepare to dig deep, your choices are an x99 mobo with a 6850k (full 44 pcie lanes), but that will only clock to around 4.6GHz, but is by far the cheapest option (4-600 ish)

AMD threadripper 1900X will offer all the pcie lanes you need at 60 to the CPU and a further 4 to the chipset, but costs a bit more, pair it with a x399 motherboard (carefully checking which model as some have very bad clamps for the CPU). This should cost around 5-800.

Finally you have the x299 i9 7900X (and up) that offer a full 44 pcie lanes to the CPU (along with 24 for the chipset), performance will be roughly on par with a 7700k clock for clock but will need to be delidded to really shine, the downside is you'll be looking at 1300 bucks atleast

[Frey]

Messaggio originale di Monk:

Right now running a pair of 1080ti's on a 7700k on a regular z270 board at x8 and x8 is fine, I was mistaken about that, however, it seems that the 1080ti will likely be the last top end card you can sli on x8 (titan V has shown issues I believe)
So for now I would just use what you have and worry about a new motherboard and CPU when you make the next upgrade.

If however you really want more pcie lanes, then prepare to dig deep, your choices are an x99 mobo with a 6850k (full 44 pcie lanes), but that will only clock to around 4.6GHz, but is by far the cheapest option (4-600 ish)

AMD threadripper 1900X will offer all the pcie lanes you need at 60 to the CPU and a further 4 to the chipset, but costs a bit more, pair it with a x399 motherboard (carefully checking which model as some have very bad clamps for the CPU). This should cost around 5-800.

Finally you have the x299 i9 7900X (and up) that offer a full 44 pcie lanes to the CPU (along with 24 for the chipset), performance will be roughly on par with a 7700k clock for clock but will need to be delidded to really shine, the downside is you'll be looking at 1300 bucks atleast

nice thanks very much.
yes i have to wait for the gtx 1180Ti, in 1 year i think.
and then i will change CPU and motherboard.

[Monk]

Probably, if you want to stick with sli (I will be), if they make any breakthroughs in the x299 side by then I'll likely upgrade that also, but, it's unlikely at this point.

[vadim]

Messaggio originale di Omega:

It's like saying that you have a single cable running from a switch to your router giving you gigabit speeds on all devices connected to that switch. Yeah you have gigabit speeds but the devices have to share the bandwidth.

Well, you are right. And you should agree that its much-much better to have single gigabit connection than ten 100Base-Ts. Because its nearly impossible for all devices to use all bandwidth at the same time. Moreover, you will be able to send multicast traffic to all devices at the full speed.
The same is true about PLX multiplexer. I tested it and it dramatically increases bandwidth.
Take into account that similarly to IP multicast multi-GPU graphics often needs to load the same data to the both cards.