Author: Robert Hyatt
Date: 10:36:26 12/17/02
Go up one level in this thread
On December 17, 2002 at 12:35:42, Vincent Diepeveen wrote: >On December 17, 2002 at 12:14:49, Matt Taylor wrote: > >>On December 17, 2002 at 11:30:36, Robert Hyatt wrote: >> >>>On December 17, 2002 at 11:28:27, Matt Taylor wrote: >>> >>>>On December 17, 2002 at 11:20:38, Enrique Irazoqui wrote: >>>> >>>>>Deep Fritz 7 runs about 8% faster on a dual Xeon 2400 (detected as 4 cpus)than >>>>>on a dual AMD MP 2200+ (2x1800 GHz). Both with DDR 333. >>>>> >>>>>Enrique >>>> >>>>Which board/chipset? I haven't seen any SMP boards that support better than a >>>>133 MHz FSB, and it's been a bitter disappointment. >>>> >>>>-Matt >>> >>> >>>hard to compare FSB clock speeds when double-pumping and quad-pumping are thrown >>>in. I think it stupid of Intel to say "quad-pumped 133" since it really isn't >>>133. It is >>>4 X 133. >> >>Do that and you get the DDR nonsense. "Oh it's a 333 MHz bus." No. It's a 166 >>MHz bus. It smells, looks, tastes, and acts like a 166 MHz bus. It has the >>latency of a 166 MHz bus. It has twice the throughput, but it is still a 166 MHz >>bus. It is DDR, but it is not 333 MHz. I'd imagine you could get rich off of all >>this false advertising. >> >>It is really difficult to define what they mean by "quad-pumped." Whether >>through ignorance or whatnot, I hear people refer to DDR as "double-pumped" and >>RDRAM as "quad-pumped," but RDRAM uses a dual-channel DDR bus. Either I'm >>missing something or the whole idea of "pumped" is ambiguous. Maybe the people I >>talk to are idiots. I don't know. > >RDRAM has 15T latency, DDR ram has 11 T latency. >if i remember well CAS2 DDR ram has 10T latency and registered ddr ram >cas 2.5 has 12T latency. I do not know about speeds of ECC registered >RDRAM but it must be a lot worse than 15T latency. > >Still a lot of the Xeons are working at quad pumped RDRAM, so that's 100Mhz >even if we jump 100 meters high. Hardly _any_ xeons are running with RDRAM. Look at Intel's web site. Look at the chipsets. No new chipsets are supporting RDRAM, they are DDR... > >100Mhz and 15T latency is a lot worse than 133Mhz and 10T latency. > >Best regards, >Vincent
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