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    Subjectre: AMD (fwd)

    >Pentium = All Pentium optizmizations
    >AMD 5x86 = All 486 Stuff, no Pentium stuff.


    >A Pentium is a Pentium, a AMD5x86 is a 486, just made run to quadrupled in
    >speed, no added Pentium instructions or anything.... AMD5x86 can do
    >everything a 486 can, but can't do everything a Pentium can, because it
    >dosen't have any Pentium instructions. here are answers to your questions, in

    >1) No. AMD5x86 only has 486 instructions. Pentium has Pentium
    > instructions.

    >2) A AMD5x86 can't do everything a Pentium can, because it doen't have
    > any Pentium instructions.

    >3) I would say the Pentium is worth the extra $$$. If you get that 5x86
    > now, you'll regret it later down the road. If you get the Pentium,
    > you'll regret it a lot later down the road :>

    There is more to the issue than that. Apparently the AMD586 has a better
    cache than any of the 486 CPUs and therefore performs much better than a 486,
    especially under high load. A friend of mine who wrote a data warehousing
    applocation found that his application ran faster on a AMD586-133 than on an
    Intel Pentium 100. The Pentium 100 won all standard bench-mark tests that he
    put to it though...
    I upgraded one of my servers from a 486-33 with 16megs RAM to a AMD586-133
    with 32megs. Before the upgrade the system load was at a minimum of 3 when the
    machine was in use, and often went above 5. After the upgrade system load was
    down to less than 0.1 for most of the time. I believe that this indicates that
    the 586-133 is more than 4 times faster than the 486-33, but this is far from a
    scientific test.
    If you buy an AMD 586 then you can use a cheap 486 motherboard and only need
    a single SIMM. You save money on CPU, motherboard, and memory.

    I run 3 Linux servers in 24*7 operation. They all have AMD586 CPUs and all
    run as well as can be expected (only problems I get are from bugs in the Linux
    kernel such as the socket FIN_WAIT2 problem we all know about).

    Russell Coker

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