How does I/O performance on Intel E5 procs change with and without QPI

HikeOnPast asked:

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.


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.

My answer:

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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