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#1
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What's the difference between an Opteron and an Athlon 64?
Well, they're both 64 bits and both use an x86-based instruction set and
both made by AMD so what exactly is the difference? Is it like the difference between a Pentium and a Xeon? Thanks and excuse my naivety. Wes |
#2
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"Wes Harrison" wrote in message ...
Well, they're both 64 bits and both use an x86-based instruction set and both made by AMD so what exactly is the difference? Is it like the difference between a Pentium and a Xeon? Thanks and excuse my naivety. Wes The Opteron has multi-cpu support, the Athlon64 truely does not. The Opteron has duel channel ddr memory the Athlon64 has one. The Athlon64 can use unbuffered memory the Opteron cannot. CPU socket... That´s about all I can think of off the top of my head Carlo |
#3
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"Nate Edel" wrote in message
... Carlo Razzeto wrote: The Opteron has multi-cpu support, the Athlon64 truely does not. True for the Opteron 24x and 84x series; the Opteron 14x is in practice single-cpu only. The Opteron has duel channel ddr memory the Athlon64 has one. IIRC, the Athlon64 FX has dual channel memory as well -- it's more of a Socket 754 vs Socket 940 difference. The Athlon64 can use unbuffered memory the Opteron cannot. CPU socket... Also AFAICT a Socket 754/940 difference: the Athlon 64 FX also seems to require registered memory. Also, currently shipping Opterons have a 333mhz FSB, while Athlon 64 and Athlon 64 FX both have a 400mhz FSB; there are, however, 400mhz FSB Opterons in the pipeline. Finally, the available clock rates are different: the Athlon 64 is available only in 2.0ghz, the Athlon 64 FX only in 2.2ghz, while the Opterons are available in 1.4,1.6,2.0, or 2.2ghz speeds. Thank you both for your replies. So what would be the difference in application of the two processors? Wes |
#4
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"Wes Harrison" writes:
Well, they're both 64 bits and both use an x86-based instruction set and both made by AMD so what exactly is the difference? Is it like the difference between a Pentium and a Xeon? Opterons have 3 HyperTransport channels, Athlon64/FX-51 has one. Opterons and Athlon64 FX-51 has a 144-bit wide memory bus while Athlon64 has a 72-bit wide memory bus. Athlon64s may appear with smaller caches but AFAIK the only currently available one (3200+) has 1MB of L2. *p |
#5
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According to Per Ekman :
Opterons have 3 HyperTransport channels, Athlon64/FX-51 has one. Does that make any performance difference? Curious, Stephen |
#6
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"Stephen Lee -- post replies please" wrote in message ... According to Per Ekman : Opterons have 3 HyperTransport channels, Athlon64/FX-51 has one. Does that make any performance difference? Curious, Stephen It makes a multi-cpu/no multi-cpu difference. Opteron line cpu's can support multi-processeors... No A64/AFX cpu can. Carlo |
#7
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"Stephen Lee -- post replies please" wrote in message ... According to Per Ekman : Opterons have 3 HyperTransport channels, Athlon64/FX-51 has one. Does that make any performance difference? It would likely make a significant difference if you used them, none at all if you didn't. Other than connecting additional CPUs on the other HT channels, the onlt other significant current application is to put the AGP port on its own channel. DS |
#8
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"Nate Edel" wrote in message ... ...although there's also the question of how many of the HT links implement the coherency protocol; the 84x implements it on all three links, the 24x on one of them, and the 14x on none of the three. Which, of course, means that the 14x is _not_ multi-processor capable. That's fine, and the current AthlonFX would be a modified 14x Opteron, but that of course will change soon, so I've been purposly ignoring the current FX as you've noticed.... The other question is whether this is _really_ a hardware difference, or whether (and this goes for the 2nd and 3rd links on the A64FX, too) it's purely a matter of the processor-ID and what the chipsets will/won't support. There is a difference because the A64 and future AFX's do/will lack the extra HT link *physically* there for there is a real difference. -- Nate Edel http://www.nkedel.com/ "But Marge! I've never felt so accepted in my life. These people looked deep into my soul and assigned me a number based on the order in which I joined." Carlo |
#9
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Nate Edel wrote:
Carlo Razzeto wrote: The Opteron has multi-cpu support, the Athlon64 truely does not. True for the Opteron 24x and 84x series; the Opteron 14x is in practice single-cpu only. The Opteron has duel channel ddr memory the Athlon64 has one. IIRC, the Athlon64 FX has dual channel memory as well -- it's more of a Socket 754 vs Socket 940 difference. The Athlon64 FX51 is essentially an Opteron 148 with a different name, including being a Socket 940 CPU. -- Mike Smith |
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