How Many PCIe Lanes Do I Have? A Guide to Know

Share on:

PCIe is the abbreviation of Peripheral Component Interconnect Express

Various PCIe slots have various physical configurations, such as x1, x4, x8, x16, and x32. The number after the x indicates the number of lanes in that PCIe slot. For example, a PCIe x8 slot has eight lanes and can move data at eight bits per cycle, and so on.

Basically, the PCIe lanes number depends on your processor and the motherboard chipset. The easiest way to know how many PCIe lanes you have is to review the specifications of the components.

How Many PCIe Lanes Do I Have

Is It Important to Know How Many PCIe Lanes I Have?

It’s quite important to know the number of PCIe lanes when you need to add a new card to the PCIe slot. If there are limited PCIe lanes, and you force to install components that occupy more than that, the components will become less productive.

You should also keep in mind that the number of available PCIe lanes in the system is not equal to the lanes that you can use. The motherboard controllers and components use the maximum of lanes.

Here, you can see, in terms of PCIe generation, the higher the generation becomes; the more bandwidth, transfer rate, and frequency rate they consist.

How to Know About My Available PCIe Lanes?

You’ve to check your CPU and the motherboard chipset’s specification document to find out the total available amount of PCIe lanes on your computer. 

1. Available PCIe lanes (CPU)

The CPU lanes power-ups the main PCIe slots of the motherboard. The processor may have lanes within the quantity of 16 to 128 according to high, low, and average quality. The AMD Ryzen processor in general has 24 lanes while the Intel Core may have from 16 to 20 lanes.

Look at the table to see the number of available PCIe lanes on modern CPUs.

ProcessorGenerationPCIe LanesSupported Version
Intel Core11th20V4.0 and 5.0
Intel Core11th20v3.0
Intel Core10th16v3.0
Intel Core9th16v3.0
Intel Core XCasade Lake48v3.0
Intel XeonCasade Lake48v3.0
AMD Ryzen5000 Series24v4.0
AMD Ryzen3000 Series (Non-G Suffix) (Zen 2)24v4.0
AMD Ryzen3000 Series (G-Suffix) (Zen+)12v3.0
AMD Ryzen2000 Series24v3.0
AMD Threadripper3000 Series64v4.0
AMD Threadripper (WX)3000 Series128v4.0

Motive of CPU PCIe lanes

The CPU lanes basically power-ups the main PCIe x16 slot along with the secondary x8 slot. These slots are generally used by the graphics card

In fact, the similar bandwidth gets divided in terms of more than one card. In case, there is just a single slot, the graphics card will use the whole bandwidth.

2. Available PCIe lanes (Motherboard Chipset)

In essence, motherboards are constructed on a certain chipset. The number of PCIe Lanes varies depending on the architecture of the chipset. You can check the manufacturer’s website to learn how many PCIe lanes a particular chipset offers. 

These are categorized as a workstation, high, mid, and budget. More PCIe lanes can afford more PCIe slots or components to a chipset. Such as USB ports, WIFI, etc. 

Look at the table to see the number of PCIe lanes on modern chipsets.

ManufacturerChipsetPCIe LanesCategory
AMDX57016High Performance
B55010Mid Range
IntelZ69028 -12x v4.0 -16x v3.0 High Performance
H67024 -12x v4.0  -12x v3.0High Performance (Minus overclocking support)
B66014 -6x v4.0 -8x v3.0Mid Range
H61012 -12x v3.0Budget
Z59024High Performance
Z49024High Performance
B46016Mid Range / Mainstream
B56012Mid Range / Mainstream

You can’t use all of the PCIe lanes listed here as PCIe slots. The controllers and other elements built into the motherboard occupy most of the lanes.

Motive of chipset PCIe lanes

The fact is chipset lanes can’t handle high bandwidth devices, but they are quite feasible while using high-speed I/O devices like x1 or x4.

The motherboard’s integrated systems are generally controlled by chipset lanes like modem, USB controller, SATA controller, etc.

Frequently Asked Questions (FAQs)

How do I check my GPU PCIe lanes?

The solution is quite easy. 

  • Install a hardware diagnostic application. 
  • Launch the application and go for the bus section.
  • Look for the PCIe bus number of the working PCIe lanes.

How do I check my NVME PCIe lanes?

Use one of these methods to check your NVMe PCIe lanes –

  • Check the motherboard yourself.
  • Use a relevant third-party application.
  • Read the hardcopy user manual.
  • Read the online specification sheet.

How many lanes are in PCIe?

Every PCIe connection has 1, 4, 8, 16, or 32 lanes for transmitting data as a standard. With more PCIe lanes, the bandwidth will rise proportionally.


Knowing about your available PCIe lanes is essential before inserting any sub-components. We hope this article has provided you with the relevant information that’ll help you to know about your available PCIe lanes. 

About The Author

Leave a Comment

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.