>Added cost?? Not sure on this one, doesn't the fpu version also include a
>bigger cache? (this is a BIG win if we don't have a second level cache.)
I believe it does include a larger cache.
[...lots of benchmarks deleted...]
Looking at some old mail from Steve, I see numbers of US$180 for the
40MHz '51 versus US$450 for the 40MHz '81. Obviously, the numbers have
probably changed since then, but the big gap is probably still there.
Seeing as we have a US$500 "cap" on the board, using the '81 would
severely limit the design...
On the general topic of benchmarking 486dx66's versus R3Ks: one thing
to remember is that the R3K is the _old_ MIPS architecture - equivalent
to the 386 in x86 terms. MIPS has most definitely moved onto the R4K
now, which offers >Pentium performance. Also note that the R4K _can_
execute the older 32 bit R3K code...
Pat -- "There's only one thing left to do Mama, I got to ding a ding dang
my dang a long ling long" (Jesus Built My Hotrod -- Ministry)
GCS d* -p+ c++ l++ m--- s+/- !g w- t- r