- Oct 14, 1999
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Is it true that K8's memory controller can only be programmed with hardcoded from the factory? Apparently the memory controllers in Opteron can be configured to run only one way, with it configured to run in dual-channels with paired ECC memory in the big boys. It also could be setup to run each 64-bits of memory controller independent of the other, but that requires more overhead by the processor and the advantages are neglible.
All of the lesser K8 chips (754-pins) will run with one memory controller. All of the better K8 chips, 939 and 940 pin models will run with both memory controllers intact, but the ECC can either turned "on" or "off" depending on the needs. The difference between the upper end K8's are that they will either run with ECC "on" (Opteron 1xx) or "off" (Athlon 64/Athlon 64 FX) because the builtin memory controller doesn't support flexible configurations. Its a shame that an onboard CMOS can't control the settings for the memory controllers.
All of the lesser K8 chips (754-pins) will run with one memory controller. All of the better K8 chips, 939 and 940 pin models will run with both memory controllers intact, but the ECC can either turned "on" or "off" depending on the needs. The difference between the upper end K8's are that they will either run with ECC "on" (Opteron 1xx) or "off" (Athlon 64/Athlon 64 FX) because the builtin memory controller doesn't support flexible configurations. Its a shame that an onboard CMOS can't control the settings for the memory controllers.
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