DFI DS levels

[ReelMonza]

DRAM Configuration Low RegisterFunction 2: Offset 90h

D_DRV (D_DRV)—Bit 1. Controls the drive strength of the DRAM device outputs when the DRAM
is driving on a READ command. This bit is required by the DRAM in the Extended Memory
Register Set (EMRS) command. It applies to all outputs.
0 = Normal Drive (default)
1 = Weak Drive (beware)

How can there be 7 drive strengths for DFI when AMD64 memory controller D_DRV is one bit only ?

I mean, why DFI has so many levels for drive strength ?

[[cTx]Philosophy]

good question my ram seems to fail perfectly great at 7 ds or 9 although it seems to run a bit longer at 9

just venting frustrations on ur post, not a flame though :p

Im just not a happy camper with these ballistix replacements at all..

[Comp-Freak]

Isn't drive strenght regulated by the motherboard with resistors? (or combo motherboard/cpu) In that case you can make more options.

[ahmad]

DRAM Configuration Low RegisterFunction 2: Offset 90h



How can there be 7 drive strengths for DFI when AMD64 memory controller D_DRV is one bit only ?

I mean, why DFI has so many levels for drive strength ?

My understanding is its either weak or normal. The rest is related to how much current the board gives it based on the setting.

For me: higher voltages = weak, low voltages = normal.