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Intel E series vs. I5

Seems like in the good old days, you could simply look at the clock speed and know which computer was faster.  But now, as we try to buy the right computer for office users, we are confronted with a wide array of confusing choices.  Specifically, the user wants Lenovo desktops, and at the low end, I see all kinds of models with E3400, 5500, 5700, 5800, 7500, and more--yet the clock speeds are all over the map, ranging from 2.6 to 3.2.  So in the E series, when you're trying to buy the fastest one, do you look at the "3400" or "5500", etc. to determine which is faster, or do you go with the faster clock speed...or how exactly DO you know which is fastest?

And then, for more money, they offer a few models that have I5 or I7 processors.  Would all of these be faster than the E series?  And if I have a choice of models with an I5, for example, can I just go with the fastest clock speed to know I'm getting the fastest computer?
2 Solutions
The i7's are the top-of-the line;  i5's are excellent and certainly "enough" for virtually any office use;  and the E series are the previous generation.

You can compare the "horsepower" of any CPU's you're considering here:
(Just search for the model's you're looking at to find the CPUMark rating)

For example, if you search for "i5" you'll see the performance of the various i5 models.   The i5-2500 is a superb performer, with a PassMark score of 6468 -- more than double any of the E series CPUs.
Hmmm.... I think when you're saying Lenovo E3400, or E550 the Exxxx designation is for the model series for Lenovo, not the processor.

For example:

an E3400, look at the proc specs, yes it's a 2.8 GHz, but it's a Celeron processor, IMHO, a horrible processor.  OK so maybe it's ok for very basic tasks for people with time and patience.

Now look at this:

Again lok at the proc specs, still a 2.8 GHz, but it's a Dual core Pentium.  Not a bad proc, but outdated.  I've got an old one of these at home and it's still getting the job done.  It's better than a Celeron, but not as good as an I5, or an I7.

FWIW, if you can get at least an I3 in your machine you will be happier.  I'd recommend an I5 though, will be good a multi-tasking and is pretty quick.  If you need serious horse power then I'd go I7.  It all depends on what you need to do.

So basically to wrap up, you have to look at not just the Clock speed, but the model line of the processor.  Newer model will have more core's, for example, dual core, quad core, hex core.  So the clock speeds are the same, but there are more processor cores in a single chip now.  Also there are other features being thrown into them, like Hyper-Threading, higher levels of cache, less power demands, etc again depending on the model line.

Hope this helps.

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