WatchGuard Firebox M370 vs Firebox M390 Bridging the Gap Between Scalable and Flexible

WatchGuard Firebox M370 vs Firebox M390: Bridging the Gap Between Scalable and Flexible

WatchGuard Firebox M370 vs Firebox M390 Bridging the Gap Between Scalable and Flexible

WatchGuard Firebox M370 vs Firebox M390: Bridging the Gap Between Scalable and Flexible

June 9, 2025

Every business needs the right tools to face modern cyber threats, and comparing the WatchGuard Firebox M370 vs WatchGuard M390 is a good start. While the M390 is a bit newer to the market, the M370 specs can still hold their own.

Many businesses have already made the jump from the Firebox M370. Whether it’s due to their business growing or staying ahead of EOL dates, the M370 won’t last forever. This article dives into WatchGuard Firebox M370 vs Firebox M390 so you can find the middle ground between scalable and flexible.

The WatchGuard Firebox M-Series

You’ll find several firewall options from WatchGuard’s M-Series. Even though both of these firewalls are relatively strong, they’re still on the entry-level end for this particular series from WatchGuard.

Understanding the difference in these firewall models can help you prepare your business for the right choice. Maybe you’re facing an EOL date or simply need to upgrade to better hardware; the WatchGuard M-Series acts as a great stepping stone.

What is the WatchGuard Firebox M370?

Advanced security features are expected here, but it comes down to the fine print in every detail. The firewall can support on-premise demands as well as cloud-manageed and hybrid environments with ease.

Here are a few specs that shine a light on what this firewall is capable of:

  • Firewall Throughput (UDP): 8 Gbps
  • VPN Throughput (UDP): 4.6 Gbps
  • Antivirus Throughput: 3 Gbps
  • IPS Throughput (full scan): 2.5 Gbps
  • Concurrent Connections: 3,300,000
Firebox M370

This can sound like more than enough for small to mid-sized organizations. It makes sense, considering this is a Firebox WatchGuard that was brought to the table to serve up to 150 users at once. If the Firebox M370 just isn’t cutting it, then it’s time to look into if the M390 would be a better fit.

What is the WatchGuard Firebox M390

Delivering a little bit more wiggle room with your network security, the Firebox M390 is just a bit stronger in most of its specifications. The M390 actually came several years after the M370 had already been on the market. With some companies facing an EOL date for the M370 in 2028, many of them are already prepping to upgrade their hardware.

This is what a jump would look like from the WatchGuard Firebox M370 to the newer M390 firewall model:

 

  • Firewall Throughput (UDP): 18 Gbps
  • VPN Throughput (UDP): 5.2 Gbps
  • Antivirus Throughput: 3.1 Gbps
  • IPS Throughput (full scan): 3.3 Gbps
  • Concurrent Connections: 4,500,000
M390

These numbers alone are hard to argue with in this comparison.  WatchGuard is a diverse network security solutions company, and this is a great example of the range of their products. There is no doubt that the M370 is more than suitable for many businesses. 

Unfortunately, if you were to get one right now, you’d only get a few more years of use out of it. The M390, on the other hand, will have quite a bit more time on the market.

Comparing the WatchGuard Firebox M370 vs Firebox M390

Another ideal option for small to mid-sized companies, the M390 is pretty powerful, considering its place in the M-Series lineup. WatchGuard Firebox tech can get a lot more impressive than this, but the M390 is a lot more feature-rich than you might expect. To see how the M390 could be a better option for your company’s security, take a look at how the specs below compare.

SpecificationsFirebox M370Firebox M390
Firewall Throughput (Gbps)818
VPN Throughput (Gbps)4.65.2
Antivirus Throughput (Gbps)33.1
IPS Throughput (Gbps)2.53.3
UTM (full scan) (Gbps)1.72.4
Concurrent Connections3,300,0004,500,000
New Connections per Second51,00098,000
Interfaces88

No need to worry about scalability here, as there are plenty of other WatchGuard firewalls, you can move up to over time. Regardless of the options that are out there, your final decision should be guided primarily by what your network security needs at this point in time.

Let’s Wrap Up

Whether you have an existing Firebox or you’re just getting started with WatchGuard, both of these firewalls shouldn’t disappoint. However, in a clear comparison, it’s the WatchGuard M390 that comes out tall.

Its specs are hard to beat in this case, and it simply surpasses what the M370 can do. If you’re looking to learn more about these Firebox models or other firewall solutions, our team is just a click away for a helpful chat.

Picture of Written by Lucas Modrall

Written by Lucas Modrall

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