The only thing you need to worry about is the difference between the I and E models. The E models exhaust front to back which is quieter than the I models (back to front). Otherwise, the differences (32/48/56 port) and Advanced license only is relevant to licensing. You can use the guide to enable all features for free. So, you'll be able to utilize all 48 SFP+ ports, both breakout QSFP+ ports (8 more 10G ports), and all four 40G QSFP+ ports, and also use the advanced L3 features. So, any ICX6550 will give you 56 10G ports and four 40G ports.
The other difference you may see is that some switches may not come with two power supplies and two fans. On the ICX6610, there are 3 revisions of the power supply - A, B, and C. The A revision is significantly louder, even when mixed with a B or C. I'm not sure if this applies to the ICX6650. Anyone know?
To understand your statement correctly, the 32/48/56 is the number of aggregate ports or SFP+ ports only?
The following description is what is confusing me:
The description says 48 in it be but s described as having 56 ports.ICX6650-48-I-ADV 56 Port
Licensing, I get it now!
Thanks, I had to read better!