B and D should show the same frequency. Think of it as something like memory timings for the northbridge itself.
Try 3.2B/D though and see if you can overclock the CPU further at settings that you're comfortable with. If you try to do it without lowering the multi you won't know whether it's the RAM or your CPU settings holding you back.
Also try lowering the CPU multiplicator to 6 or 7 and stay with the 4.0B/D multiplier and increase your FSB to see how high your RAM can go.
I wouldn't worry though about using a lower multi for the RAM though since it doesn't actually provide any noticeably performance difference. Here's an explanation I worte for someone else:
Quote:
Now the bandwith of the RAM to NB is the same if the 2.0 system memory multiplier is used, i.e. DDR2 667 for a 333 (1333 quad-pumped) FSB CPU, DDR2 800 for a 400 FSB CPU. If you increase the RAM speed without increasing the FSB, data is transferred faster to the NB from RAM, but the NB can't pass it on any faster to the CPU than before though resulting in no performance benefit (there's a litte benefit actually, as latency is improved if RAM speed goes up, but it's small ~5% or so).
If you're not overclocking get DDR2 800 RAM, if you plan on overclocking in the future get 1066 DDR2 (runs at 533 MHz so you can increase your FSB to 533 (2133 quad pumped) without having to overrclock the RAM). The reason why faster DDR2 RAM exists is solely for overclocking purposes, as slower will limit the maximum overclock of your CPU.
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