OK, I've done some more research. Looks like you're right, but so was I.
Athlon XP _was_ the top-line 32-bit CPU (and Duron was the value-priced
one, i.e. Celeron competitor). However, the Athlon 64 line has now
completely taken over the "top-line" segment from AMD. The Duron has been
discontinued already, and the Athlon XP is being discontinued under that
name. The Semprion is mostly a rebranding of the Athlon XP, except that
it's now being marketed as the "value" alternative -- kind of the new
Duron (Celeron competitor).
The first Semprions (using Socket A) are really just rebranded Athlon XPs,
as you say. However, as subsequent Semprions are moving to the newer
Socket 754, they're nonetheless using the Thoroughbred Athlon core instead
of the marginally superior Barton core of the latest XPs (to keep costs
down). These Semprions also have a smaller L2 cache, presumably for the
I had been under the impression that Athlon 64 CPUs were still in the
'early adopter' market. Looks like I was wrong; they're mainstream
This makes things a bit more complicated vis-a-vis getting a new OS/2 box.
For years, I'd had my heart set on an Athlon XP for "my next box". If I'd
kept to my anticipated timetable, that would have happened for sure. My
current box dates from early 1999, so by rights I should have upgraded
some time in 2003. However, I got a new laptop that year, so I decided to
push the upgrade of my main box back to 2004. Except... for some reason,
I never did get around to upgrading. You know, s_t happens...
So now I have the choice of getting a dead-end architecture (Athlon XP)
with a mainboard that undoubtedly won't allow any CPU upgrade in the
future... or getting a bleeding-edge Athlon 64, which as I gather is still
largely unproven for extensive OS/2 use.
At least... I've heard a few tales of difficulty regarding Athlon 64 CPUs
and OS/2, but not that many (either good or bad). I'd assumed that's
because the AMD64 is not yet widely used. But if I'm wrong (and it looks
like I was), then TONS of people must be using it. Does that mean that
there are lots of people using OS/2 on AMD64 and not having any trouble?
I suppose the other option is dual Athlon MPs... but I'm reluctant to go
with SMP (or dual-core) because of the complications it can introduce.
Remove hat to reply (reply-to address).