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Xeon E5 instruction flags?

I was looking at this CPU and it says the only instruction flag it supports is AVX. But then I found this CPUz analysis and it says it supports SSE among a host of other flags. So what's the deal? Is the Intel site wrong? I can't imagine a CPU only supporting one instruction flag.
 
Why doesn't the Intel website say that?

For most things, everything is a super set of the previous set. It says 64-bit instruction set, but it supports the previous 3 instruction sets. (real, virtual x86, protected mode)

Do you want video cards to say they are DirectX 11.2, 11.1, 11.0, 10.1, 10, 9, ... compatible? That could be pretty tedious!!!
 
In another forum this guy was really adamant about telling me that the only flag it supported was AVX. LMAO!

I think this forum has a lot more better minds and I find more useful information.
 
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