That CPUs have differences in performance, and so do Perl versions?

# This is perl, v5.10.1 (*) built for i486-linux-gnu-thread-multi

# negative
       Rate    d    c    e    a    b
d 1219274/s   --  -7% -15% -20% -31%
c 1315339/s   8%   --  -9% -13% -26%
e 1441482/s  18%  10%   --  -5% -19%
a 1519028/s  25%  15%   5%   -- -15%
b 1778883/s  46%  35%  23%  17%   --

# positive
       Rate    d    e    c    a    b
d 1300194/s   --  -3%  -6% -13% -13%
e 1336169/s   3%   --  -3% -10% -10%
c 1375954/s   6%   3%   --  -7%  -8%
a 1486080/s  14%  11%   8%   --  -0%
b 1492276/s  15%  12%   8%   0%   --
[download]

The winner here is, quite unexpectedly, B.

Another cpu, also on Perl 5.10.1 but amd64, says B is 80% faster than the worst contender (E) when negative; and A is 51% faster than E (B having the second place at 42% faster) when positive.

Third cpu with Perl 5.14.4 gives a negligible win for E -- D being the low anchor. So I think we can conclude that the Perl version matters the most?