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DevangJoshi

help with understanding pci lanes

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Posted · Original PosterOP

Hi everyone I'm building my first PC and my journey has been way out of order so far. I started by getting an ASUS x299 prime deluxe motherboard because I wanted to just go crazy. My question is, how many pcie lanes will my system use?

 

I plan on running one gpu, one - two M.2 drives and one - two sata drives. I guess my real question is am I limited by the number of pcie lanes the CPU has? If a CPU has 28 pcie lanes, can I only add hardware that uses a total of 28 pcie lanes?

 

Noob question for sure but it could make a difference on the CPU I get (I'm getting anxious to get the system up and the CPU is the last bit)

 

Here is my part list:

 

4 dimms of ram

1 gpu

2 m.2 drives

1 SSD

1 HDD

Thanks!

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That is cpu lanes for video card or other pcie devices that utilize cpu lanes such as nvme

 

The chipset has its own pcie lanes although i am not sure how many but for your setup you dont have to worry about it.


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agreed. even if your GPU uses 8 lanes instead of 16 because of another device... you're not going to notice a difference.


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13 minutes ago, DevangJoshi said:

Hi everyone I'm building my first PC and my journey has been way out of order so far. I started by getting an ASUS x299 prime deluxe motherboard because I wanted to just go crazy. My question is, how many pcie lanes will my system use?

 

I plan on running one gpu, one - two M.2 drives and one - two sata drives. I guess my real question is am I limited by the number of pcie lanes the CPU has? If a CPU has 28 pcie lanes, can I only add hardware that uses a total of 28 pcie lanes?

 

Noob question for sure but it could make a difference on the CPU I get (I'm getting anxious to get the system up and the CPU is the last bit)

 

Here is my part list:

 

4 dimms of ram

1 gpu

2 m.2 drives

1 SSD

1 HDD

Thanks!

PCI-E lanes are lanes for your PCI-E slots (including M.2) your average modern day GPU will eat 16 PCI-E 3.0 lanes (though unless you are running something on the level of a 2070 for faster your GPU can get away with 8 ) and an M.2 NVME will usually eat 4 so assuming you have 2 NVME drives (the most possible lanes that your current setup could consume)  and that you have a modern GPU your PC will probably consume 24 lanes.


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