Quick Answer
If your firewall mini PC mainly handles home routing, VLANs, and standard OPNsense or pfSense services, the Intel N100 is usually an economical and power-efficient choice.
If you need heavier VPN workloads, IDS/IPS, multiple network services, Proxmox, or virtual machines, the Intel Core i3-N305 is a better fit.
The Intel N100 has 4 cores / 4 threads, boosts up to 3.40 GHz, and has a 6 W TDP. The Core i3-N305 has 8 cores / 8 threads, boosts up to 3.80 GHz, and has a 15 W TDP.
However, this does not mean the N305 will automatically deliver twice the firewall throughput of the N100.
1. N100 vs N305 Specifications
| Specification | Intel N100 | Intel Core i3-N305 |
|---|---|---|
| Cores | 4 | 8 |
| Threads | 4 | 8 |
| Max Turbo | 3.40 GHz | 3.80 GHz |
| Cache | 6 MB | 6 MB |
| TDP | 6 W | 15 W |
| AES-NI | Yes | Yes |
| Intel VT-x | Yes | Yes |
| Intel VT-d | Yes | Yes |
Both processors support AES-NI, Intel VT-x, and VT-d.
For firewall users, the main differences are therefore core count, parallel processing capacity, power consumption, and cooling requirements.
2. When Is the N100 Enough?
If the firewall has a clearly defined role, the N100 is a very practical choice.
Typical workloads include:
- NAT
- Basic firewall rules
- DHCP
- DNS
- VLAN routing
- Multi-WAN
- OPNsense
- pfSense
- Light VPN use
Four CPU cores provide enough processing room for a dedicated firewall without turning the appliance into a high-power platform.
The N100's low-power characteristics also make it well suited to compact fanless firewall mini PCs, provided the chassis has an appropriate thermal design.
3. When Does the N305 Make More Sense?
The N305 becomes more attractive when the firewall is no longer doing only firewall work.
For example:
- Multiple VPN tunnels
- IDS/IPS
- Traffic inspection
- Network analytics
- Multiple security services
- Proxmox
- Virtual machines
- Firewall + additional services
The N305 has eight cores compared with four on the N100, giving it more CPU resources for concurrent workloads.
This becomes especially useful when:
Firewall services and other workloads are competing for CPU resources.
If you plan to run the firewall as part of a Proxmox host rather than installing it directly on bare metal, the N305 is generally the more natural choice.
4. N100 or N305 for VPN?
Both the N100 and N305 support Intel AES-NI, so either processor can serve as a foundation for encrypted network workloads.
However, actual VPN throughput also depends on:
- VPN protocol
- Encryption algorithm
- Number of tunnels
- Packet size
- Software implementation
- Other services running at the same time
If VPN is only used occasionally for remote access, the N100 may already be sufficient.
If VPN is one of the firewall's primary workloads and you want more performance headroom, the N305 is the better choice.
5. Which One Should You Choose for IDS/IPS?
IDS/IPS can significantly change firewall hardware sizing.
A basic firewall may primarily perform:
Route → Check Rule → Forward
IDS/IPS adds deeper traffic inspection, which means the CPU has more work to do.
OPNsense's official hardware sizing guidance also notes that intrusion detection and prevention can significantly affect hardware requirements.
If you expect to run heavier IDS/IPS workloads continuously, we would generally choose:
N305 over N100.
6. N100 vs N305 for a Proxmox Firewall
Both CPUs support VT-x and VT-d, so both provide virtualization-related features.
Their practical roles, however, are different.
If an N100 runs OPNsense directly:
Most of the CPU resources can be dedicated to the firewall.
If you run Proxmox, the processor also has to support:
- Proxmox host
- OPNsense VM
- Other VMs
- Containers
- Monitoring
- DNS services
In this situation, the N305's eight cores provide considerably more room for resource allocation.
Quick Selection
| Workload | Better Fit |
|---|---|
| Dedicated Home Firewall | N100 |
| Basic OPNsense / pfSense | N100 |
| VLAN + Light VPN | N100 |
| Heavy VPN | N305 |
| IDS/IPS | N305 |
| Proxmox + OPNsense | N305 |
| Multiple VMs / Services | N305 |
7. Does a 10GbE Firewall Automatically Need an N305?
No.
A 10GbE interface only means:
The link can negotiate at 10GbE.
It does not guarantee that the CPU can process a full 10Gbps firewall workload under every condition.
If you are building a faster or more complex firewall, the N305 gives you more CPU headroom than the N100, but the complete workload still needs to be evaluated.
FAQ
Is the Intel N100 Enough for OPNsense?
For basic routing, VLANs, standard firewall rules, and light services, the N100 is a practical low-power choice.
Is the N305 Worth the Upgrade?
If you need heavy VPN, IDS/IPS, Proxmox, or multiple services, the N305's additional CPU resources are more useful.
For a basic router, that extra performance may remain unused.
Which CPU Is Better for a Fanless Firewall?
The N100 is easier to cool passively because of its lower power consumption.
The N305 can also be used in compact systems, but chassis design and thermal management become more important under sustained load.
N100 or N305?
The decision can be summarized simply:
If the firewall has one primary job, start with the N100.
If the firewall is becoming a multi-service server, choose the N305.
That is more useful than choosing a CPU purely by port count or advertised network speed.
Related Guide: CWWK Firewall Mini PC Guide
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