PCI-e lanes bottleneck? ...more I read more I am confused

[Healadin]

Hello,

 

I have laptop MSI GE62VR, it has i7 6700hq that has 16 lanes and gtx 1060 3gb (desktop gare) GPU. I have added m.2 ssd (samsung 960 evo) and according to MSI specs it uses 4 lanes. CPU is cappable of running in 1x16, 2x8, 1x8+2x4 lanes modes according to intel site. I wonder when I added SSD I just forced it from 1x16 to 1x8+2x4 mode and probably "cut" some GPU lanes. Can it lower GPU performance?

 

laptop spec and CPU spec

https://www.msi.com/Laptop/GE62VR-6RF-Apache-Pro.html#hero-overview
https://ark.intel.com/products/88967/Intel-Core-i7-6700HQ-Processor-6M-Cache-up-to-3_50-GHz

[NTDaws]

Short Answer, Yes.

[WereCat]

x8 is plenty for any GPU

[Brooksie359]

3 minutes ago, Dawson Wehage said:

Short Answer, Yes.

what are you talking about? 8 lanes of pcie 3.0 is more than enough for any modern gpu.

[access denied]

4 minutes ago, Healadin said:

Hello,

 

I have laptop MSI GE62VR, it has i7 6700hq that has 16 lanes and gtx 1060 3gb (desktop gare) GPU. I have added m.2 ssd (samsung 960 evo) and according to MSI specs it uses 4 lanes. CPU is cappable of running in 1x16, 2x8, 1x8+2x4 lanes modes according to intel site. I wonder when I added SSD I just forced it from 1x16 to 1x8+2x4 mode and probably "cut" some GPU lanes. Can it lower GPU performance?

 

laptop spec and CPU spec

https://www.msi.com/Laptop/GE62VR-6RF-Apache-Pro.html#hero-overview
https://ark.intel.com/products/88967/Intel-Core-i7-6700HQ-Processor-6M-Cache-up-to-3_50-GHz

You could sell that M.2 and get an ordinary SSD and (If you don't use the disk drive only, I assume that laptop has one) use the DVD slot to put the SSD there.

[Brooksie359]

1 minute ago, NoNamer12345 said:

You could sell that M.2 and get an ordinary SSD and (If you don't use the disk drive only, I assume that laptop has one) use the DVD slot to put the SSD there.

but why though?

[NTDaws]

1 minute ago, Brooksie359 said:

what are you talking about? 8 lanes of pcie 3.0 is more than enough for any modern gpu.

It can lower performance. Not by much, but it can. 

[Healadin]

1 minute ago, NoNamer12345 said:

You could sell that M.2 and get an ordinary SSD and (If you don't use the disk drive only, I assume that laptop has one) use the DVD slot to put the SSD there.

well that was my original idea, then I found out it has this PCI-e slot and its like 5x faster than regular ssd

[HelplmChoking]

6 minutes ago, Healadin said:

Hello,

 

I have laptop MSI GE62VR, it has i7 6700hq that has 16 lanes and gtx 1060 3gb (desktop gare) GPU. I have added m.2 ssd (samsung 960 evo) and according to MSI specs it uses 4 lanes. CPU is cappable of running in 1x16, 2x8, 1x8+2x4 lanes modes according to intel site. I wonder when I added SSD I just forced it from 1x16 to 1x8+2x4 mode and probably "cut" some GPU lanes. Can it lower GPU performance?

 

laptop spec and CPU spec

https://www.msi.com/Laptop/GE62VR-6RF-Apache-Pro.html#hero-overview
https://ark.intel.com/products/88967/Intel-Core-i7-6700HQ-Processor-6M-Cache-up-to-3_50-GHz

 

So it will decrease the available bandwidth to/from the GPU, but the GPU will never (especially a 1060) use all 16 PCIe 3.0 lanes, so the actual performance won't change.

[Brooksie359]

1 minute ago, Dawson Wehage said:

It can lower performance. Not by much, but it can. 

not it can't all test comparing the performance between 16x and 8x 3.0 were within statistical error. only 1 to 2 fps diffrence is too small to say that the pcie lanes were the cause. 

[HelplmChoking]

2 minutes ago, Dawson Wehage said:

It can lower performance. Not by much, but it can. 

Not on a 1060 it won't.

[Mira Yurizaki]

Two things

• M.2 NVME uses the chipset's PCIe lanes, not the processor's PCIe lanes. Unless you're using an X99 board.
• You can run even a GTX 1080 at PCIe 3.0 x4 speeds and it won't really hamper it all that much: https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_PCI_Express_Scaling/

So in other words, adding an NVME SSD to your computer won't affect the GPU's PCIe lane allocation. And even if it did, it's not going to appreciably affect performance.

[Brooksie359]

http://www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-performance-impact-on-gpus this is a test showing that ti wont have any affect on the performance. there are 1 or 2 fps difference in some of the test but that cant be determined as the result of the pcie lane differences. 

[access denied]

You can just literally benchmark it, do a test with the M.2 and do it without. And that will be your answer!

[Healadin]

2 minutes ago, NoNamer12345 said:

You can just literally benchmark it, do a test with the M.2 and do it without. And that will be your answer!

yeah that would be good idea, but I already moved system there and formatted original hdd

[Healadin]

20 minutes ago, WereCat said:

x8 is plenty for any GPU

also hi fellow slovak guy

13 minutes ago, Brooksie359 said:

http://www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-performance-impact-on-gpus this is a test showing that ti wont have any affect on the performance. there are 1 or 2 fps difference in some of the test but that cant be determined as the result of the pcie lane differences. 

shame there cannot be two answers as best answer (well it wouldnt make sence in being "best answer" but would mark yours too)

 

also thanks for all the answers guys