I know that Toshiba MeP-h1works at 1Ghz clock speed. But is there any
other processor cores with about 1.5Ghz clock speed available? IBM?
Intel? AMD? MIPS?
IBM, Intel and AMD all sell some 1.5GHz chips, as does Freescale
(formerly Motorola's semiconductor devision). There are probably a
handful of others as well, 1.5GHz isn't all that high of a speed
anymore. It's more a question of what ISA you're looking for, what
features you need, power consumption constraints, etc. If you're very
flexible on those sorts of things, a simple Intel Celeron-M processor
would probably do the trick. They're available in the ~1.5GHz range
and are quite easy to find for well under $100.