On Wednesday 08 April 2009, Jan Heichler wrote: ... > JL> Peter Kjellstrom wrote: ... > >> Can anyone confirm that mixing different sizes of dimms, even when > >> keeping to a by-three-symmetric configuration, actually does degrade > >> performance? > >> > >> That is, first hand information that config 1 will be slower than config > >> 2: > >> > >> 1: two sockets, 3x 1G and 3x 2G per socket RDIMM (total 18G @1066) > >> 2: two sockets, 6x 1G(or 2G) per socket RDIMM (total 12G (or 24G) @1066) > >> > >> /Peter > > JL> I can confirm it because I've got it on a test box I've been running :) > > Can you give us the result of a stream-benchmark? with 12 x RDIMM in > asymmetric config and 6 x RDIMM ? both running at 1066?
Note that both my configs 1 and 2 above are 12xRDIMM and "symmetric". The only thing that differs is wether it's purely one DIMM size or two. 12x vs 6x @1066 is a completely different config and I wouldn't be surprised to see a performance difference. /Peter
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