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I am in the process of specifying a low-mid range server (which we will purchase multiples of). The application is essentially a software router, so it is very NIC-based I/O intensive. Processor selection is proving challenging.

In comparing the Intel E5-1410 (4C, 2.8GHz) to a price-comparable E5-24xx proc like the E5-2407 (4C, 2.2GHz), one notable difference is that the 2407 has a QPI bus, while the 1410 does not. Details are sparse, although it is clear that the 1410 can only be run in a single die configuration.

I understand that the QPI bus is used to share IO across processors/cores. It appears that the 1410 has integrated IO in lieu of QPI, but it seems impossible to find even a rough metric with regards to I/O performance between the two processor variants.

How might I go about doing price/performance evaluation of the two processor variants? I'm sure that I'll need to test for my particular use case, but I'm having a challenging time finding even general information on relative performance.

EDIT:

The 14xx series does not support memory sparing and memory mirroring, which is supported by the 24xx series. Still looking for details WRT IO capability.

The E5-2407 has a single 6.4GT/s QPI connection good for 204.8 Gbit/s.

The E5-1410 has a single DMI 2.0 connection good for only 20 Gbit/s.

If you care about IO you NEED the 2407 ok.

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    • The E5 platform has an on-die PCI-E 3.0 controller, one of the big changes of the new E5 platform. A great advantage is that PCI-E traffic doesn't have to traverse QPI links anymore (as was the case with Nehalem and Westmere). From a technical POV you should get all the IO goodness you'll need with any of the E5s.
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    • In the case of IO QPI/DMI is for hooking up a PCI-E root complex to the cores/memory. DMI 2.0 equals (it essentially is) PCI-E 2.0 4x. If any of the components you care about needs more bandwidth then you won't be able to get more than that.

Buy one of each and test them. I think that's about the only way you can be sure how your particular application will perform.

I didn't find anything more in a quick Google search than you did.

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    • Agreed, but my question is targeted at structural/spec differences between the two processor families rather than "what will run my app the fastest?"

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