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What is the difference betwwen two Xeon CPUs with stepping 11 and 7?

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http://serverfault.com – Would you please explain me what kind of differences between these two CPUs have: 1) processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Xeon(R) CPU E5345 @ 2.33GHz stepping : 11 cpu MHz : 2324.000 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxs (HowTos)