Does lock-step and interleaving work on 840 boards with SDRAM via MRH-S repeaters or is lock-step limited to RDRAM? I have a Supermicro PIIIDME ww.supermicro.com/PRODUCT/MotherBoards/840/PIIIDME.htm
It says that interleaving works, and I believe I need all 4 DIMM sockets populated for that. Memory bus is 100 no matter what FSB is. Does this make a theoretical bandwidth of 1.6GB w/SDRAM?
Next, what about lock-step with all 4 DIMMs? Does that allow 3.2GB/s? Or how about 1.6GB/s assuming no interleaving is active. I’ve read all the Intel tech docs on the 840 and they don’t seem to mention anywhere that lock-step is limited to RDRAM (which does 3.2GB/s w/o interleaving.) In fact, I believe the topic is avoided because they don’t want anybody to know that you can get such bandwidth from SDRAM with much lower latency–assuming lock-step works.
Any recommended memory benchmarks would be nice too (Sandra crashes.)