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Answered: Is PCIe Backward Compatible?

Learn about PCI-Express version and lane backward compatibility.

PCI-Express Kevin Jones / TechReviewer

Last Updated: January 7, 2023

Written by Kevin Jones

Are PCIe Versions Backward Compatible?

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PCI-Express versions are backward compatible, meaning that you can use a PCIe 4.0 graphics card or storage device on a PCIe 3.0 or PCIe 2.0 system. However, PCI-Express will use speeds based on the lowest of the two versions for communication. For example, if you use a PCIe 3.0 NVMe SSD with a PCIe 4.0 system, the SSD would be running at PCIe 3.0 speeds.

Reducing the PCIe version would halve the max potential bandwidth. However, you may not experience a performance impact if your device is not using the available bandwidth.

You can refer to the following table to determine the bandwidth limit and decide whether that is adequate for your needs.

PCI-Express Speeds (Rounded)
x1 Bandwidth x2 Bandwidth x4 Bandwidth x8 Bandwidth x16 Bandwidth
PCIe 1.0 250 MB/s 500 MB/s 750 MB/s 2 GB/s 4 GB/s
PCIe 2.0 500 MB/s 1000 MB/s 2 GB/s 4 GB/s 8 GB/s
PCIe 3.0 1 GB/s 2 GB/s 4 GB/s 8 GB/s 16 GB/s
PCIe 4.0 2 GB/s 4 GB/s 8 GB/s 16 GB/s 32 GB/s
PCIe 5.0 4 GB/s 8 GB/s 16 GB/s 32 GB/s 63 GB/s
PCIe 6.0 8 GB/s 16 GB/s 32 GB/s 63 GB/s 126 GB/s

Check out my Recommended Intel and Recommended AMD PCIe 5.0 CPUs and motherboards below.

Are PCIe Versions Forward Compatible?

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PCIe versions are forward compatible, meaning that you can use a newer PCIe device with an older system. However, PCI-Express will use speeds based on the lowest of the two versions for communication.

Check out the table above to determine what the throughput limit would be for a specific configuration.

Multiple PCIe Versions for CPU/Motherboard

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Some CPUs and motherboards provide PCI-Express lanes at multiple PCIe versions. In these cases, you can choose which devices need the most bandwidth to decide which should be connected to the highest version PCIe lanes. While laying out your system, keep in mind that PCIe speeds will be based on the lowest PCIe version between the slot/port and the device.

PCIe Slot Compatibility

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You can insert a PCIe add-in card (AIC) into a slot that supports a higher number of lanes. In this case, it would use up to the number of PCIe lanes that the card has. For example, you could insert an x4 PCIe network card into an x16 PCIe AIC slot, and it would run at full x4 speed.

Lane Availability

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In various scenarios, a PCIe device may not use the maximum number of lanes for which the device was designed. For example, some motherboards have x8 PCIe ports that are only electrically wired for x4 lanes. In another case, a system may have limited lanes provided by the CPU, distributed based on availability or configuration.

Devices will negotiate the number of lanes to use, based on system availability, and should still perform fine at a reduced overall bandwidth in most cases. Refer to your motherboard's documentation and CPU specifications to determine PCIe lane quantities and allocations.

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Thinking of upgrading your CPU to support PCIe 5.0? Here are our recommendations:

Best Intel 13th Gen High-Performance CPU and Motherboard

  • Our recommended Intel 13th gen high-performance enthusiast CPU: Intel Core i9-13900K Intel Core i9-13900K Check Price on Amazon Amazon Affiliate Link
    • Up to 5.8 GHz max-turbo stock speed: perfect for games, video editing, and high-intensity tasks.
    • 24 cores (8 Performance + 16 Efficiency): This combination makes it a great all-around system that can handle any task you throw at it.
    • Virtualization features make it great for running virtual machines.
    • Check the latest price of the Intel Core i9-13900K on Amazon (affiliate link).
    • For the Intel Core i9-13900K CPU, you'll need a motherboard with overclocking support to overclock the CPU. Motherboards with the Z790 chipset typically support CPU overclocking. Otherwise, you can use a motherboard with Intel's other 600-series desktop chipsets (e.g., Z690, H670, B660, H610).
  • Our recommended motherboard to pair with the i9-13900K: MSI MEG Z790 ACE Gaming Motherboard MSI MEG Z790 ACE Gaming Motherboard Check Price on Amazon Amazon Affiliate Link
    • PCIe 5.0 support
    • It supports up to 128 GB of DDR5 memory (DDR5 provides the fastest memory speeds)!
    • 2.5 Gbps Ethernet port is faster than any home Internet speed available with tons of room to spare for file transfers.
    • Wi-Fi 6E makes it easy to reach the fastest speeds and future-proof your Wi-Fi system.
    • Bluetooth 5.3 is great for streaming music to Bluetooth headphones.
    • Five x4 NVMe M.2 slots, which is fantastic! One of these supports PCIe 5.0 speeds, and the rest run at PCIe 4.0 speeds.
    • USB 3.2 Gen 2x2 offers 20 Gbps USB speeds!
    • Check the latest price of the MSI MEG Z790 ACE Gaming Motherboard on Amazon (affiliate link).

Best Runner-Up Intel 13th Gen CPU and Motherboard

  • Our recommended Intel 13th gen high-performance CPU: Intel Core i7-13700K Intel Core i7-13700K Check Price on Amazon Amazon Affiliate Link
    • Up to 5.4 GHz max-turbo stock speed: perfect for games, video editing, and high-intensity tasks.
    • 16 cores (8 Performance + 8 Efficiency): This combination makes it a great all-around system that can handle almost any task.
    • Virtualization features make it great for running virtual machines.
    • Check the latest price of the Intel Core i7-13700K on Amazon (affiliate link).
    • For the Intel Core i7-13700K CPU, you'll need a motherboard with overclocking support to overclock the CPU. Motherboards with the Z790 chipset typically support CPU overclocking. Otherwise, you can use a motherboard with Intel's other 600-series desktop chipsets (e.g., Z690, H670, B660, H610).
  • Our recommended motherboard to pair with the i7-13700K: ASUS ROG Strix Z790-E Gaming WiFi 6E ASUS ROG Strix Z790-E Gaming WiFi 6E Check Price on Amazon Amazon Affiliate Link
    • PCIe 5.0 support
    • It supports up to 128 GB of DDR5 memory (DDR5 provides the fastest memory speeds)!
    • 2.5 Gbps Ethernet port is faster than any home Internet speed available with tons of room to spare for file transfers.
    • Wi-Fi 6E makes it easy to reach the fastest speeds and future-proof your Wi-Fi system.
    • Bluetooth 5.3 is great for streaming music to Bluetooth headphones.
    • Five x4 NVMe M.2 slots, which is fantastic! One of these supports PCIe 5.0 speeds, and the rest run at PCIe 4.0 speeds.
    • USB 3.2 Gen 2x2 offers 20 Gbps USB speeds!
    • Check the latest price of the ASUS ROG Strix Z790-E Gaming WiFi 6E on Amazon (affiliate link).

Best Value Intel 13th Gen CPU and Motherboard

  • Our recommended Intel 13th gen best value CPU: Intel Core i5-13600K Intel Core i5-13600K Check Price on Amazon Amazon Affiliate Link
    • Up to 5.1 GHz max-turbo stock speed: great for games, video editing, and high-intensity tasks.
    • 14 cores (6 Performance + 8 Efficiency): This combination makes it a great all-around system that can handle almost any task.
    • Virtualization features make it great for running virtual machines.
    • Check the latest price of the Intel Core i5-13600K on Amazon (affiliate link).
  • Our recommended Value motherboard to pair with the i5-13600K: MSI MAG B760 Tomahawk WiFi DDR4 Gaming Motherboard MSI MAG B760 Tomahawk WiFi DDR4 Gaming Motherboard Check Price on Amazon Amazon Affiliate Link
    • PCIe 5.0 support
    • It supports up to 128 GB of DDR4 memory.
    • 2.5 Gbps Ethernet port is faster than any home Internet speed available with tons of room to spare for file transfers.
    • Wi-Fi 6E makes it easy to reach the fastest speeds and future-proof your Wi-Fi system.
    • Bluetooth 5.3 is great for streaming music to Bluetooth headphones.
    • Three x4 NVMe M.2 slots, which is fantastic! These slots all support PCIe 4.0 speeds.
    • USB 3.2 Gen 2x2 offers 20 Gbps USB speeds!
    • Check the latest price of the MSI MAG B760 Tomahawk WiFi DDR4 on Amazon (affiliate link).

Best Intel 12th Gen High-Performance CPU and Motherboard

  • Our recommended Intel 12th gen high-performance enthusiast CPU: Intel Core i9-12900K Processor 16 Cores (8P+8E) up to 5.2 GHz Intel Core i9-12900K Processor 16 Cores (8P+8E) up to 5.2 GHz Check Price on Amazon Amazon Affiliate Link
    • Up to 5.2 GHz: perfect for games, video editing, and high-intensity tasks.
    • 16 cores (8 Performance + 8 Efficiency): Quite a few cores considering the frequency! This combination makes it a great all-around system that can handle almost any task.
    • Virtualization features make it great for running virtual machines.
    • Check the latest price of the Intel Core i9-12900K on Amazon (affiliate link).
    • For the Intel Core i9-12900K CPU, you'll need a motherboard with overclocking support to overclock the CPU. Motherboards with the Z690 chipset typically support CPU overclocking. Otherwise, you can use a motherboard with Intel's other 600-series desktop chipsets (e.g., H670, B660, H610).
  • Our recommended motherboard to pair with the i9-12900K: GIGABYTE Z690 AORUS Master GIGABYTE Z690 AORUS Master Check Price on Amazon Amazon Affiliate Link
    • PCIe 5.0 support
    • It supports up to 128 GB of DDR5 memory (DDR5 provides the fastest memory speeds)!
    • 10 Gbps Ethernet port is faster than any home Internet speed available with tons of room to spare for file transfers.
    • Wi-Fi 6E makes it easy to reach the fastest speeds and future-proof your Wi-Fi system.
    • Bluetooth 5.2 is great for streaming music to Bluetooth headphones.
    • Four x4 NVMe M.2 slots, which is fantastic! Three of these run at PCIe 4.0 speeds, and one at PCIe 3.0 speeds.
    • USB 3.2 Gen 2x2 offers 20 Gbps USB speeds!
    • Check the latest price of the GIGABYTE Z690 AORUS Master on Amazon (affiliate link).

Best Intel 12th Gen Value CPU and Motherboard

  • Our recommended Intel 12th gen value CPU: Intel Core i5-12600K Intel Core i5-12600K Check Price on Amazon Amazon Affiliate Link
    • Less than half the price of the i9-12900K, but still excellent performance at up to 4.9 GHz.
    • 10 cores (6 Performance + 4 Efficiency): This core count makes it suitable for everyday multi-threading tasks, such as having tons of browser windows open.
    • Virtualization features make it great for running virtual machines.
    • Check the latest price of the Intel Core i5-12600K on Amazon (affiliate link).
    • For the Intel Core i5-12600K CPU, you'll need a motherboard with overclocking support to overclock the CPU. Motherboards with the Z690 chipset typically support CPU overclocking. Otherwise, you can use a motherboard with Intel's other 600-series desktop chipsets (e.g., H670, B660, H610).
  • Our recommended motherboard to pair with the i5-12600K: GIGABYTE Z690 AORUS PRO GIGABYTE Z690 AORUS PRO Check Price on Amazon Amazon Affiliate Link
    • PCIe 5.0 support
    • It supports up to 128 GB of DDR5 memory!
    • Three NVMe M.2 slots, which is excellent! These all run at PCIe 4.0 speeds.
    • 2.5 Gb Ethernet port is faster than most home Internet speeds with room to spare for file transfers.
    • USB 3.2 Gen 2x2 offers 20 Gbps USB speeds!
    • Check the latest price of the GIGABYTE Z690 AORUS PRO on Amazon (affiliate link).
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Best Feature CPU and Motherboard

Runner-Up CPU and Motherboard

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Before purchasing memory, review your motherboard specification to verify which speeds are supported. For example, if a DDR4 motherboard stated that it supports "DDR4 3400(O.C.) / 3333(O.C.) / 3300(O.C.) / 3200 / 3000," that would mean that it could support DDR4-3400, DDR4-3333, and DDR4-3300 with memory overclocking, and DDR4-3200 and DDR4-3000 at stock speeds. Motherboard specifications also indicate the maximum capacity per stick of RAM (DIMM) and across all slots.

Get RAM recommendations
for a specific Intel CPU:
Get RAM recommendations
for a specific AMD CPU:
  • At an effective frequency of 3200 MHz, this memory hits the fastest supported stock DDR4 speeds. Corsair Vengeance LPX DDR4 Corsair Vengeance LPX DDR4 Check Price on Amazon Amazon Affiliate Link
  • It is also available in other (effective) frequencies for overclockers, including 3600 MHz and 4000 MHz.
  • Lower-speed versions are also available on Amazon, in various capacities, including DDR4-2933 (affiliate link), DDR4-2666 (affiliate link), and DDR4-2400 (affiliate link).
  • The low-profile form factor ensures that the heat spreaders don't get in the way of other devices, including your CPU heatsink.

Other Considerations When Building a PC

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Want to brush up on other new technologies to consider when building a computer? Check out these articles:

Learn More About PCI-Express

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Want to brush up on the latest PCIe products, versions, and features? Check out the articles in this PCI-Express series: