With so many Latitude models mentioned in discussion I am getting a bit confused. I have had E6330, E6430S, E6320, E7240/7250, E7270, 7480/7490.

have to resort to wiki.  The first number is class.  The second number indicates the size of the screen, the third number for year of release, which roughly corresponds to Intel cpu gen (or +1)

e.g., 6330: 3rd gen, 6320: 2nd gen, 7240: 4th gen, 7250: 5th gen, 7270: 6th gen, 7480: 7th gen, 7490: 8th gen.

the fourth number is most commonly 0, but occasionally 1 for slightly higher spec, or 5 for AMD.

**00	**10	**20	**30	**40	**50/60	**70	**80	**90
2008/09	2010	2011	2012	2013	2015	2016	2017	2018
2019	2020	2021		2014

Premium Ultrabook
15"	(ultrabook)											9510	9520
14"												9410	9420

Ultrabook
15.6"	(ultrabook)												7520
14"					6430u	E7440	E7450	E7470	7480	7490	7400	7410	7420
13.3"								7370	7380	7390	7300	7310
12.5"	(ultrabook)					E7240	E7250	E7270	7280	7290

High-End
15.6"	High-End	E6500	E6510	E6520	E6530	E6540
14"		E6400	E6410	E6420	E6430	E6440
13.3"		E4300	E4310	E6320	E6330
12.5"		E4200		E6220	E6230

Midrange
15.6"	E5500	E5510	E5520	E5530	E5540	E5550	E5570	5580	5590	5500	5510	5520
									5591	5501	5511
14"	E5400	E5410	E5420	E5430	E5440	E5450	E5470	5480	5490	5400	5410	5420
									5495
									5491	5401	5411
13.3										5300	5310	5320
12.5"						E5250	E5270	5280	5290

Entry-level
15.6"	Mainstream					3540	3550/3560	3570	3580	3590	3500	3510
14"						3440	3450/3460	3470	3480	3490	3400	3410
13.3"						3340	3350		3380	3390	3301
	Entry										3300	3310