Questions about Dell Latitude Line

rohitparker,

Unfortunately, there are no external sites for viewing these systems. You would need to bring each one up on our sales page at the link below.

Dell Sales

One somewhat efficient way I've found for comparing system is to look at their datasheets or spec sheets, which I find by simply Googling for example "Latitude 7480 datasheet" or "Latitude 7480 spec sheet".  When they're available (and unfortunately they aren't always), they're PDFs that provide a summary of the system and then a table with detailed specs, and since the tables are usually in a consistent format, comparisons are pretty easy -- although again, they have to exist.  Failing that, if you're not familiar with Dell's model numbering conventions, that might at least help somewhat, so I'll describe that.

The first digit is the series designation.  For systems of the same generation, a 7000 Series will be better than a 5000 Series, which will be better than a 3000 Series.  Often "better" refers to how light it is, build quality (chassis materials, keyboard quality), available ports (Thunderbolt 3, USB-C, etc.), available hardware options from the factory (NVMe SSDs vs. SATA SSDs vs. spinning HDDs), availability of enterprise features like vPro, etc.

The second digit is the display size.  "4" means 14-inch, "5" means 15-inch, and so on.

The third digit is the generation.  So the Latitude 7490 is simply the next generation of the Latitude 7480.

The final digit is the variation.  Sometimes Dell will offer a given model with both Intel and AMD processors, for example, in which case the AMD version might be a Latitude 7482 or 7483, for example.  However, it's pretty rare to see this anywhere in Dell's product line these days, especially with laptops.  In other cases, the last digit might indicate a different form factor, e.g. there's an XPS 9570 and a 9575; the latter is a 2-in-1 convertible tablet model, and it actually differs quite a bit in other hardware specs too.  Lastly, with some Inspiron models, there's only one variation available, but the sole variation uses a non-zero digit, e.g. Inspiron 7577.

The biggest difference between the 5490 and 5491 appears to be the CPU - the 90s use the Kaby Lake-G CPU, while the 91s have the option at least of the Coffee Lake H CPUs.  Bearing in mind both use the same 3  or 4 cell battery, the battery runs on the 90s will be far higher (these are 15 W processors) than they will be on the 91s (these CPUs draw up to 45W).

And unless the 91s have appreciably upgraded heatsinks -- expect the 91s to run a lot warmer than the 90s do.  Anything drawing 3X the power will generate 3X the heat, all else equal.