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We announced with Intel back in November that we would be getting early access to Skylake [1]. Today's announcement is that we're ready to let more people in the door.

[1] https://cloudplatform.googleblog.com/2016/11/power-up-your-G...

E3 is not a server SKU, it's meant for workstations and it's more similar to i7 than E5. It lacks various features including ECC RAM which, I suppose, is a no-starter for cloud hosting. Also some virtualization capabilities are missing, notably accelerated interrupt injection (APICv+posted interrupts).

E3 does support ECC RAM. I'm running a Haswell Xeon E3-1225 with 16GB ECC RAM as my workstation.

I believe that the ability to use ECC RAM is actually the main differentiator between i7 and E3.

I've seen E3's in low end servers like the Dell T20...