The difference between new and older CPUs is pretty easy to explain.
Older microarchitectures have 64-bit mmx/sse execution units and split 128bit sse ops into 2 64bit microops.
Newer archs have 128bit sse units.
- AMD K8: 2 64bit units
- intel Core/Core2: 3 64bit units
- AMD K10: 2 128bit units
- intel nehalem: 3 128bit units
K10 = Opterons with 4 or more cores, Phenom, Phenom II, Athlon II
nehalem = xeon 34xx/35xx/36xx/55xx/56xx/65xx/75xx, i3/i5/i7
Thanks for clearing that up. I read the link someone posted about AMD making that change around 2007, but I didn’t know what the story was for Intel.
There’s no hope for Core/Core2 then. They only have half the SSE2 hardware.
Strange that Intel has 3 128bit units, but AMD with 2 128bit units is the faster one.
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