Author: Matt Taylor
Date: 09:11:11 03/20/03
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On March 20, 2003 at 10:45:33, Robert Hyatt wrote: >On March 20, 2003 at 06:58:18, Frederic Louguet wrote: > >>I have a Dual Xeon 2.8 Ghz here (Dell WS450) with 533 Mhz bus, chipset E7505, >>1 GB ram (2 x 512 PC2100 dual-channel non ECC non Registered), Windows XP Pro >> >>ScienceMark 2.0 beta indicates a maximum memory latency of 88.86 ns and a >>2865 MB/s memory bandwith. >>I don't run Linux and I don't have LMBench but maybe the ScienceMark results are >>similar. > > >What about LM Bench? > >My dual 2.4's, 2.8's have the E7500 chipset and are reporting 150ns (fastest is >145) >with 400mhz FSB and registered ECC RAM (DDR). The 3.06's here have the same >chipset as yours, with the same 533mhz FSB, but latency is _still_ at 145ns >roughly. > >Perhaps it is the registered / ECC ram that is slowing things down, although I >would not >use non-ECC memory on any critical machine. Mission-critical, you mean, and Crafty isn't mission-critical... I've got ECC ram, and I've never experienced a failure in all of the last 9 months that I've had it. (Failures generate machine check exceptions which get logged for me, and the only machine checks I have logged were generated by internal ECC checks on the registers in my Athlon.) Non-ECC is faster. I believe it's the registered part that makes it so slow. I -think- you can buy ECC unregistered, but most companies won't make it because most people want both at the same time. This is what Micron said, anyway. I'm pretty sure I've seen ECC unregistered, but it's not terribly popular. There are usually restrictions on unregistered ram. I have 4 DIMM sockets and can only use 2 unless I use registered ram. Most other DDR boards I've looked at have the same restriction, from the Abit KG7 to the latest & greatest. -Matt
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