What's the difference between 3 GHz and 3E GHz?

[real_ki]

Please take a look at this Intel web site:
http://processorfinder.intel.com/Lis...483&SearchKey=

You will see that for the processor speed some has E added to it like 3 GHz vs. 3E GHz, and 3.20 GHz vs. 3.20E GHz. Looking at their spec info, I don't really see any differences between the E and non-E speed.

Anyone here happen to know the difference between E and non-E processor speed? And if so, which is better (assuming the bus speed and cache are same)?

At first I thought the E was for Extreme Edition, but I don't think that is it because I found a separate set of list like the one above site shows for the P4 Extreme Edition.

Look forward to hear from the experts...
Thanks!

[123456]

The x.x0E processors use the older 478 socket while the non-E ones use the newer LGA775 socket.

[jlreich]

The E means it is a s478 Prescott core. The best and last core of the s478 era with it's faster FSB, smaller process size, and hyper threading. The ones without an E can also be s478 but are the earlier cores usually with a slower FSB. You won't find a s775 with an E on the end even though Prescott cores lived on into the early s775 days.

[real_ki]

Cool. Thanks, jlreich! So basically the ones with E are probably better than the ones without E.

[jlreich]

Yes, but make sure your system supports the 800MHz FSB. You will usually see something on the motherboard box or manual about being "Prescott ready".

[6Sons]

Thanks, i have learned much as well.

[real_ki]

Thanks again jlreich.
And yes, my mobo does support 800MHz FSB.