Confused on How to Calculate How Many Lanes I Am Using

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no1statistician

Commendable
Aug 21, 2016
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I'm a bit new to building my PC and I think I may have a problem on overusing my bandwidth for my lanes which may be causing random video card crashes and/or usb slots.

My motherboard is an ASUS z-170a and my CPU is an Intel I5-6600k. What I have plugged in is an XFX Rx 480 (requires additional power) into pci-e x16 lane, Inateck Superspeed 4 Ports PCI-E to USB 3.0 Expansion Card (requires additional power) into PCI-E x4 lane, and 1 Silicon Power SSD S-55 (requires additional power) plugged into the motherboard by a SATA cable. Can someone please explain how I can calculate if I have enough bandwidth in my lanes to support this?
 
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no1statistician

Commendable
Aug 21, 2016
21
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1,520
Sure Fuzzy, a motherboard and a CPU can support "x" number of PCI-E lanes (like bandwith). I think mine is 16 and each device you plug in takes "y" number of these "x" lanes. You cannot go past the maximum number of lanes. I'm wondering if I went past the maximum number of lanes supported by my motherboard and CPU.
 
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Snipergod87

Snipergod87

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May 26, 2009
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You can't go beyond, other devices will simply not work. It also depends what is plugged into the PCI-E lanes for the CPU and PCH. GPU's always go direct to the CPU, storage is generally PCH (M.2 can be different) and some other PCI-Express slots can either be PCH or CPU, either way it will divide them up as necessary. A "Lane shortage" is not the problem.
 
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