Sonicwall speed quality curiosity

I have recently replaced a old Sonicwall TZ180 with a newer Sonicwall TZ105, and I have noticed that my speed test from the old firewall was 20mbps to 30mbps and now with the TZ105 is 50mbps to 60mbps, I'm just very curious based on what reason, will anyone here happen to know? I know that both units have a 10/100 wan port, I just don't know what would cause such improvement.

PS: I've reset the TZ180 to factory default and tried again, same results.
Cheers
-jdff
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jdffAsked:
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arnoldCommented:
According to the spec, the tz105 has a higher throughput 200Mbs firewall.  What is your wan connection speed?
http://www.sonicwall.com/us/en/products/TZ-105.html#tab=specifications

Do both in your test had DPI enabled?
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jdffAuthor Commented:
Comcast business 60mbps.
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arnoldCommented:
The older model, has a lower max throughput, 90 Vs 200 of the 105.
speedtest.net has a mini version that can be downloaded and setup on an internal web server you could use that to test the max throughout on the tz180 .

more speculation than anything else, the new one has claims that deal with a better mechanism to deal with packet assembly that could explain the improvement.
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JohnBusiness Consultant (Owner)Commented:
I had to replace a Cisco RV042 with a Cisco RV042G to get higher internal throughput to match the increase in my ISP speed. This is the same thing as you have seen here with your upgrade.
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jdffAuthor Commented:
It does make sense, I guess that's about it. Thank you all.
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JohnBusiness Consultant (Owner)Commented:
@jdff  - You are very welcome and I was happy to help.
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