For a new Raspberry Pi network-services host, the Raspberry Pi 5 is the strongest default if you want Gigabit Ethernet, more RAM configurations, and the option of PCIe storage. The Raspberry Pi 4 Model B is still a practical choice: it also has Gigabit Ethernet, USB 3.0, microSD boot, and configurations up to 8 GB of RAM. Choose memory and storage for the services and activity you expect, and use a power supply suited to the exact board and its peripherals.
Raspberry Pi 4 or Raspberry Pi 5?
Both models provide Gigabit Ethernet, so their basic wired-link specification is the same. The clearest hardware distinction for a network-services build is that Pi 5 adds a single-lane PCIe FFC connector and offers a 16 GB RAM configuration. Pi 4 remains capable of using microSD or USB storage and is available with up to 8 GB RAM.
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| Choice factor | Raspberry Pi 4 Model B | Raspberry Pi 5 |
|---|---|---|
| RAM configurations | 1, 2, 3, 4, or 8 GB (Raspberry Pi product specifications) | 2, 4, 8, or 16 GB (Raspberry Pi hardware documentation) |
| Ethernet | Gigabit | Gigabit (1 Gb/s) |
| Storage interfaces and boot | microSD and USB 3.0 | microSD, USB 3.0, and a single-lane PCIe FFC connector |
| Recommended power supply | 5 V at 3 A; official 15 W USB-C supply | 5 V at 5 A; official 27 W USB-C supply. With a 5 V/3 A supply, downstream USB current is limited to 600 mA (Raspberry Pi getting-started guide) |
| Power over Ethernet | PoE-capable with a compatible HAT | PoE+-capable with a compatible HAT |
Specifications identify available hardware; they do not establish which board will deliver a particular server speed or handle a particular number of services. Choose Pi 4 if its RAM options and storage connections suit your planned setup and you do not need the PCIe path. Choose Pi 5 if its additional RAM configuration or PCIe storage option is useful. Actual application throughput depends on the network and workload as well as the board.
How much RAM does a Raspberry Pi network server need?
There is no universal minimum supported by the published specifications. Raspberry Pi lists Pi 4 configurations from 1 GB through 8 GB, and Pi 5 configurations from 2 GB through 16 GB; those figures describe models, not the requirements of DNS, a VPN, a file server, Home Assistant, containers, or any combination of them.
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Size memory around what will run at the same time and how it will be used:
- Count the services and applications you plan to keep running together.
- Allow for concurrent clients and any caches or datasets the software keeps in memory.
- Account for containers, if you plan to use them, and for a desktop or other software running on the same host.
- After deployment, check actual memory use during ordinary and busier periods. That gives you a better basis for adjusting the configuration than a service-count rule unsupported by the specifications.
Should you boot from microSD, USB storage, or NVMe?
microSD is Raspberry Pi’s most common boot medium and is a straightforward choice for a simple service setup with limited writes. Newer models also support booting from USB mass storage and network boot (PXE); Raspberry Pi 5 adds a PCIe route for NVMe storage. Raspberry Pi’s getting-started guide notes that faster storage devices with higher read and write speeds improve overall performance.
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- microSD: A simple local boot option for a modest setup. The cited guidance does not set a service-specific capacity or endurance threshold.
- USB SSD: An option when you want more local storage or faster storage than your chosen card provides. Check the drive’s power draw and boot compatibility.
- PCIe/NVMe on Pi 5: An additional storage route, but it may require a compatible adapter or expansion board. Confirm the specific hardware and boot support before building around it.
- Network boot: A supported boot option on newer models, but it depends on the network setup and is not the same as storing the system locally.
Interfaces and boot support do not guarantee that every drive or adapter will work in every configuration. The official guidance does not establish a network-server lifespan or write-endurance rating for these choices.
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Pi 4 and Pi 5 both specify Gigabit Ethernet. For a fixed host that needs to be reachable consistently, wired Ethernet is a sensible default when practical. Raspberry Pi’s getting-started guide says to connect a cable to a router, hub, or switch; Raspberry Pi OS automatically connects. The guide also covers headless setup over Wi-Fi or Ethernet, with remote access through SSH or Raspberry Pi Connect.
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The Gigabit port specification is not a promise of sustained application throughput: real performance depends on the network path, other devices, and the service itself. For services clients must reliably find, arrange a stable address through the router or your network design. That is practical network administration, not a board performance guarantee.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What power supply should you use?
Use a supply matched to the board, then account for attached devices. Raspberry Pi says its models require 5.1 V and that current needs vary by model and peripherals. Its getting-started guide recommends an official Raspberry Pi supply: 5 V at 3 A for Pi 4 Model B, and 5 V at 5 A for Pi 5. The named official USB-C supplies are 15 W for Pi 4 and 27 W for Pi 5.
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Pi 5 can also operate with a 5 V/3 A supply, but Raspberry Pi specifies a 600 mA downstream USB peripheral-current limit in that configuration. With a 5 V/5 A supply, its downstream USB limit can reach 1.6 A. A USB SSD, external disk, modem, or other high-draw device can therefore affect the power plan. If attached devices exceed the board’s stated USB limit, Raspberry Pi recommends an externally powered USB hub.
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Low-voltage warnings can result from a low-quality supply or cable. Raspberry Pi cautions that inadequate power can cause unpredictable behavior or storage corruption, making power quality relevant to a host expected to run continuously.
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Using Power over Ethernet
PoE is optional, not necessary for an ordinary wired setup. Pi 4 Model B supports PoE (IEEE 802.3af-2003), and Pi 5 supports PoE+ (IEEE 802.3at-2009), but both need a compatible HAT to draw power through Ethernet. Check that the switch or injector matches the required standard and has enough total power budget for the installation.
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