Hi There,
Unfortunately my background is hardware electronics design, so my definition of 64 bit tends to be a bit more "under the hood" than most.
Having worked, many years ago for <cough> Cyrix </cough> (remember them) as a CPU/motherboard design consultant at the time of the launch of the 6x86 CPU, the 6x86 at that time was the first CPU to have speculative execution etc etc. So I did my time in CPU design, on this basis I judge true 64bit or not.
Thanks for the comments, I guess I am purist on what really should carry the 64bit label or not.....
P.
Ryan Sweet wrote:
On Tue, 3 May 2005, Peter Farrow wrote:
Thanks Ryan,
I have already posted a reply while you were typing your...
go take a look......
Right, and while your comments are generally correct, specifically when discussing HPC applications for the processors concerned, a) the original comments were not sufficiently useful to draw the distinction, b) even if HPC specialists (this is my day job also) may decide to draw such a distinction between EM64T and opteron (and I would say that certainly not all of the folks on the various beowulf lists would use the term 64bit the way you were using it), the fact is that the industry in general, and Intel/RedHat/Dell (the three comanies featuring in this discussion) have settled upon a different definition of a 64bit CPU than you have.
Also, as for the speed of EM64T when runnin 32bit versus 64bit, once again the HPC mantra must be "it depends upon your application", because I have seen a number of cases where it can go either way.
and yes, I use both EM64T and opteron, yet for much the same reasons that you have already given, we tend to lean heavily to the opteron.
regards, -Ryan
P.
Ryan Sweet wrote:
On Tue, 3 May 2005, Peter Farrow wrote:
You may of course believe what you like.......
M. Farrow,
I am quite convinced that M. Baker-LePain is not discussing matters of belief, but of fact (fact that was on Intel's roadmap two years ago and has been a released product for nine months). Please it is preferable if you don't begin arguments, but if you choose to have an argument at least start with a remotely tenable position.
http://www.intel.com/products/processor/xeon/index.htm
It is true that the original xeons were 32bit cpus, but Intel chose to keep the Xeon name for its EM64T technology.
regards, -Ryan
Joshua Baker-LePain wrote:
"based on the same x86_64 technology that AMD introduced with their Opterons."
If you didn't top post, you wouldn't have to re-type my quote.
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