What's the different between Scorpion and pure A9 CPU?

[Carter07]

Cortex A9 is faster than scorpion principally because it's an out of order architecture (not partial), has more L2 cache and more bandwidth (in most soc implementations).

I have both cpus and I found that 1ghz cortex A9 performs like a 1.5ghz scorpion (measured with fps meter in 3 games).

In floating point calcolations scorpion may have a slightly advantage but I don't think ppsspp uses (yet?) NEON.
I don't know either if floating point operations are important for emulators in general.
Maybe Henrik can tell us more.