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Subject: Re: I mean affordable SMP!

Author: Vincent Lejeune

Date: 17:07:03 03/12/00

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On March 12, 2000 at 18:01:28, Robert Hyatt wrote:

>On March 12, 2000 at 17:03:53, Tom Kerrigan wrote:
>
>>On March 11, 2000 at 09:01:19, Vincent Lejeune wrote:
>>
>>>>EV6 is both good and bad.  Good for performance.  bad for price.  it is a 256
>>>>bit bus.  Which is not cheap, from a memory point of view...
>>>>
>>>>Supposedly the athlon is pin-compatible with an alpha, at least that was the
>>>>original promise, so the el-cheapo machine could be built based on the athlon,
>>>>but when performance was needed, the athlon could be replaced with a real
>>>>21264 (or higher) alpha chip to really go fast.
>>>
>>>The athlon is pin-compatible as promised but it is "not electrically compatible"
>>>with the alpha processors , as it was said since the biginning of the
>>>developpement of the Athlon. According this, there's NO motherboard where could
>>>plug an athlon or a alpha, and I bet there will be not one, because the 2
>>>products don't target the same users : Ahtlon for home/office automation and
>>>Alpha for workstations/research computers/university
>>
>>I was pretty sure that pin-compatible meant electrically compatible. Otherwise
>>AMD wouldn't make such a big deal about having processors that are
>>pin-compatible with Intel. The whole deal with the AMD 486, K5, etc. was that
>>they could be dropped into Intel mobos.
>>
>>I was also pretty sure that one of the reasons why the Athlon uses the EV6 bus
>>is to make EV6 hardware cheap, so Alpha systems would become cheaper, and people
>>would buy lots of Alphas to upgrade their Athlons...
>>
>>-Tom
>
>
>That was my original thought/hope when I first saw the AMD announcement on
>EV6 compatibility.  I can't imagine a cpu chip that is compatible with the EV6
>but which won't replace an alpha or vice-versa...  IE both plug into the same
>socket, interface with the same bus.  Would seem (to me) that they would both
>be compatible replacements for each other...???

I've read the opposite in an article about the Athlon : The Athlon is "not
electrically compatible" with the alpha processors !
Now, more investigation will confirm or annul this statement ...
I've no time to invest in this search but if someone could, he would bring the
truth
Thanks in advance ;)



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