> GZIP/MP3 - could this be a function of I/O more than processor speed. Pi2 with 1GB will have less RAM to do encoding. Valid test, but may show up I/O short comings of Pi.
Good point. All the (micro)SD cards used are class 10 ratings. So I suppose the I/O conditions are the same for all three hardware.
> CPU multi-core test may be more down to the 1GB Ethernet than the cores as using OpenSSL and Apache. Pi Ethernet is from USB, so not fast.
Not true. Apache testing is done via local loopback interface. So Ethernet speed is not a factor. Also, openSSL is a cryptographic operation, which is purely CPU dominant.