scottz Posted November 21, 2005 Share Posted November 21, 2005 I just put together a Supermicro PDSGE 955X board with a Pentium D 840 and a pair of XMS2 CM2X1024 6400PRO sticks. It turns out I'm having trouble with using Dual DDR2 with this combination. I have these in the blue slots for interleaved memory as Supermicro suggests and I'm getting some pretty abysmal scores using default SPD ( 5-5-5-15 @ 667 ) Using Everest v2.20.405 and SiSoft Sandra 2005 SR3 1069 for testing I get the following: In "dual channel mode" I get: Everest Read = 2105MB/s (slower than a 1.7 P4 with PC2100) Write = 386MB/s (slower than a 1.6 P4 with PC133) Latency = 252ns (Yuck!) Sandra RAM Bandwidth Int Buf'd iSSE2 = 5048 RAM Bandwidth Float Buf'd iSSE2 = 2073 Turns out I get roughly the same scores when both sticks are installed in any combination of slots. In single channel (1 stick installed) Everest Read = 5107MB/s Write = 1981MB/s Latency = 89.6ns Sandra RAM Bandwidth Int Buf'd iSSE2 = 4515 MB/s RAM Bandwidth Float Buf'd iSSE2 = 4500 MB/s I tested both sticks one at a time and there were no differences. Big difference in scores here. Any ideas? Link to comment Share on other sites More sharing options...
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