Which FortiGate Model is Right for My Business? A Sizing Guide

One of the most frequent questions we encounter from IT leaders across the Kingdom is: "Which FortiGate model is right for my business?"

Choosing the correct FortiGate firewall model is a high-stakes decision. If you select a model that is undersized, it will become a network bottleneck, frustrating users and slowing down business operations. If you over-spec the hardware, you are sinking capital expenditure (CapEx) into capacity that will never be used.

While a detailed traffic analysis by a certified Fortinet partner is essential, this guide outlines the three critical engineering factors that dictate a professional sizing decision.

Factor 1: Threat Protection Throughput vs. Marketing Throughput

The first mistake many organizations make is sizing based on the "Firewall Throughput" number at the top of a datasheet. In the modern Saudi enterprise environment—where fiber speeds in cities like Riyadh and Jeddah are rapidly increasing—basic stateful throughput is a misleading metric.

The only metric that matters is Threat Protection Throughput. This reflects the firewall’s performance with all critical security engines—IPS, Antivirus, and Application Control—running simultaneously. If your internet line is 500 Mbps but your firewall can only perform threat inspection at 200 Mbps, you have effectively paid for an internet connection you cannot use securely.

Factor 2: User Density and Concurrent Sessions

It is no longer enough to count "heads" in the office. You must account for device density and session load. The modern professional typically carries three devices: a laptop, a smartphone, and a tablet. Each device maintains multiple concurrent sessions with cloud services like Microsoft 365, Salesforce, and Zoom.

A business with 100 users might actually be supporting 400+ active devices. An appropriately sized FortiGate must have enough RAM and CPU cycles to maintain these session tables without dropping connections or causing latency.

Factor 3: Architectural Complexity (SD-WAN and Segmentation)

Your network's specific topology will dictate the hardware requirements. Sizing for a single-site office is vastly different from sizing for a regional hub.

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Understanding the FortiGate Series

To help narrow your search, Fortinet hardware generally falls into three categories:

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Get an Expert Sizing Recommendation from ITBuilders

A datasheet can only tell you part of the story. To ensure your investment is optimized, you need an assessment that looks at your actual traffic patterns, your compliance roadmap, and your three-year growth plan.

ITBuilders is a leading FortiGate provider in Riyadh and across KSA. Our certified engineers don't just "sell boxes"; we perform structured assessments to ensure you invest in a model that provides maximum performance and security value. We help you avoid the bottleneck of undersizing and the waste of oversizing.

Don't guess your capacity. Know it.

Request a free firewall sizing consultation → call 920-020-750, email [email protected], or visit itbuilders.com.sa.