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#21
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On Wed, 19 May 2004 09:30:57 +0200, Jan Vorbrüggen
wrote: opteron is amazing in that it has its switching technology built in via ht. Yawn - the 21364 had that how many years ago? Considering that the 21364 only just started shipping a few months before the Opteron... not much (Jan. 2003 for the Alpha EV7, April 2003 for the Opteron). Also there is a grand total of *ONE* system being sold with the Alpha EV7 processor, the HP GS1280, and it'll set you back a cool million dollars or so. In short, not really a worthwhile comparison. For all intents and purposes, the 21364 is a non-existent product. ------------- Tony Hill hilla underscore 20 at yahoo dot ca |
#22
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In article ,
Tony Hill wrote: In short, not really a worthwhile comparison. For all intents and purposes, the 21364 is a non-existent product. Can we please stop wasting everyone's time by telling other posters that their example is irrelevant because it doesn't ship in enough volume, etc? It's pointless. -- greg |
#23
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On 18 May 2004 23:59:57 +0100 (BST), Thomas Womack
wrote: ....snip... I'm not sure I'd call a system with two dual-core CPUs a quad system, though I'm not quite sure where that prejudice comes from; I suppose that part of the issue of a quad system is the enormous motherboard required physically to fit four sockets, four cooling systems, four sets of memory ... on memory-intensive tasks I think I'd rather have more memory subsystems than more cores, dual-core Opterons will be no less memory-starved than 800MHz FSB Noconas. Tom With each dual-core chip containing the same dual channel memory controller as the current crop of socket 940 chips, each core would have the same memory bandwidth as current socket 754 Athlon64. While not quite as impressive as A64 FX/Opteron, A64 xx00+ is still a formidable CPU and doesn't seem to really badly suffer from insufficient memory bandwidth. If I could get a quad A64 on the cheap (comparably priced to the dual Opteron 242/MSI Master2-far I am building now), I'd go for it without much thinking. Unfortunately it's not possible technically (the number of HT links enabled on each CPU etc.) But 2 dual core Opterons would closely resemble that hypothetical quad A64, just better because it would have 2 heatsinks/fans less. As for having more memory subsystems than cores, here is an article comparing lowly (among dual boards) MSI K8T Master2-far to higher end Tyan K8W Tiger and yet even higher Tyan K8W Thunder. http://www.neoseeker.com/resourcelink.html?rlid=68739 Contrary to expectations, the more expensive Thunder with both CPUs connected to own memory is not any better than its humble competitors with one CPU accessing the memory through the other (give or take a fraction of a percentage point). |
#24
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Tony Hill wrote:
On Tue, 18 May 2004 15:54:33 -0600, Rob Stow wrote: Never anonymous Bud wrote: Where did you find a price? I can't locate ANYONE that has that MB available. $1545 at Lynn Computer, up from $1495 a couple of weeks ago. They are taking orders only - no stock yet. http://www.lynncomp.com Ahh the infamous Lynn Computers. They ALWAYS take orders for thing, regardless of whether or not they plan on getting them in stock! That store is constantly listing products that won't ship for months. If *any* vendor doesn't have something in stock I don't order from them. At best I'll ask them to call or e-mail me when they do actually have something to sell. And with any vendor, if the product isn't at my door within 24 hours of the promised delivery date I call in to cancel the order. As far as Lynn goes, I've ordered three Tyan S2885 motherboards and 6 Opty processors to put on those - two orders altogther - and both orders arrived 3 days later. Not that bad for cross border shipping (US to Canada). I suspect it takes 24 hours to get to Regina and then another 48 hours to cover the last 70 km from Regina to Moose Jaw. |
#25
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#26
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i agree that the 2 core opterons will likely open the floodgates on
4-way heaven and begin the price falls. |
#27
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Tony Hill wrote:
Hopefully that time might be coming soon, that's what started this whole thread. The trick is that next year AMD is expecting to ship dual-core Opterons that are pin-compatible and infrastructure-compatible with existing single-core Opterons. If all goes according to plan they will be drop-in replacements for current Opterons, so all you would need for a 4-core machine is a "2 processor" motherboard (whether or not that makes a true "4 processor" system or just a "2 processor with dual cores" machine depends on your point of view). Those 2P motherboards start at only ~$200, though good ones will cost you more like $500. No word yet on the price of the chips, but they might sell for $350 a piece, and most likely will sell for less than $700 a pop (2 cores for $700 will keep in your price range of single-core for $350). That's another thing, dual-core 2-way processors. However, I think these server makers are actually looking to getting down the price of a true 4-way processor system down to the $5000 range. Yousuf Khan |
#28
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On Thu, 20 May 2004 01:45:39 GMT, (Greg Lindahl)
wrote: In article , wrote: Contrary to expectations, the more expensive Thunder with both CPUs connected to own memory is not any better than its humble competitors with one CPU accessing the memory through the other (give or take a fraction of a percentage point). Given that you didn't give any details at all, the most likely ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^ Have you not noticed the link? Just in case I am providing it here again: http://www.neoseeker.com/resourcelink.html?rlid=68739 Please note that I bear no responsibility for either the content of that article or the methodology the authors applied to their benchmarks. I just found the comparison interesting and worth noting in the groops. explanation is pilot error. I know that STREAM on Linux 2.6 with the bios interleave set off and a user-level utility to confine the processes appropriately is much improved. And my testing with various HPC codes also showed significant improvement. -- greg |
#29
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"Andi Kleen" wrote in message ... snip. As far as I can see the main difference in practice right now is that there is a PCI-E connector and there isn't one for HT. And the error handling issues Del noted (hopefully be fixed with HT 2.x) Ok and HT hotplug would be nice too. -Andi Can't have much wire and a connector in a 56 ps skew+jitter allocation (at 1.6 Gb/s), with no provision for aligning clock and data. :-( The last draft of V2.0 goes to 2.8 Gb/sec still with no alignment. I'll have to look at the "networking extensions", but the 8131 doesn't have any recovery. Maybe there is a new version coming. del |
#30
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