Replacing a FortiGate 3700D with a FortiGate 900G?

Hello,

The best is to confirm with:

https://support.fortinet.com/welcome/#/lifecycle

Anthony

Your question is not so clear if it’s actually a question. 
If you’re questioning about the Management’s proposal and concerning about the performance difference, you need to compare both datasheets 

The performance of 900G seems to be slightly higher than 3700D, which is 3 generations older than G-Series. 

http://fortilab.pl/wp-content/uploads/2018/10/FortiGate_3700D.pdf
https://www.fortinet.com/content/dam/fortinet/assets/data-sheets/pdf/fortigate-900g-series.pdf
 

Toshi

Not enough information here. What are your current connections and user base? System resources? Need more or less? Work with your Fortinet account team and Fortinet partner.

Hi ​@ceva156 

Please refer datasheet of both devices.

What is the expected load you are looking for in the new 900G?