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One thing to consider is that different instances of the same class may be deployed on widely varying hardware. For c1.xlarge instances we've seen very different cache size and CPU specs (cat /proc/cpuinfo) and now always try to get on the machines with a 20mb cache - our benchmarks show these to be better for our needs.

I have heard anecdotally that it's not uncommon for large players to bulk-start instances and then kill all of the ones that don't have the latest hardware.

Update: I just looked at 4 random c1.xlarge instances we have running, and found 3 different types of underlying hardware:

1. Intel(R) Xeon(R) CPU E5410 @ 2.33GHz w/ 6144kb cache

2. Intel(R) Xeon(R) CPU E5506 @ 2.13GHz w/ 4096kb cache

3. Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz w/ 20480kb cache

Of these cores, the E5410 is from 2007, E5506 is from 2009 and the E5-2650 is a Sandy Bridge from last year.

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