Interleaved memory in application to nForce 420-D, 850e, and 32-bit RIMMs

[Athlon4all]

I was talking in the DDR400 vs PC1200 thread in GH, and I am very confused on a couple things in regards to nForce and 850e/32-bit RIMMs and I was wondering if anyone could fill me in.

1: What is nForce 420-D's memory controller?? Is it Dual Channel DDR like E7500? Is it simply nothing more than Interleaved Memory controller?? Or what???
2: In 32-bit RIMM's, both 16-bit channels from the 850e chipset are run to a single RIMM slot correct??? Whats the benefit??? Originally, I thought that the 32-bit RIMMs would have internally dual 16-bit channels that would double the RIMM's bandwidth (ie PC1066 would get 4.2GB/ps per each chipset channel), and they would eliminate the need for a dual channel 850 chipset, but that doesn't quite make sense, but there still are some unanswered questions that I have. Like really what is the benefit or difference with 32-bit RIMM's? Other than not neededing to install them in pairs, I don't see the benefit. The Chipset still needs to be a dual channel chipset correct??? 2 pairs of 16-bit traces still have to be run from the chipset to the ram correct???
3: What exactley does the term "Dual Channel" mean??? What is the difference between Dual Channels and say 2 interleaved memory controllers like what nForce may be?

Thanks guys for any info you can provide🙂

 

[Locutus4657]

As far as I understand your questions
1). nForce is a dual channel DDR memory controller like the intel one you mentioned
2). 32 Bit rambus means each memory modual is 32 bits, a dual channel implementation would be 64 bits wide, twice the bits as the origianl rambus thus it'll be much faster
3). Dual channel means they force you to install memory in pairs because the data path from the memory to the CPU is twice as wide as the memory moduals them selves...

Originally posted by: Athlon4all
I was talking in the DDR400 vs PC1200 thread in GH, and I am very confused on a couple things in regards to nForce and 850e/32-bit RIMMs and I was wondering if anyone could fill me in.

1: What is nForce 420-D's memory controller?? Is it Dual Channel DDR like E7500? Is it simply nothing more than Interleaved Memory controller?? Or what???
2: In 32-bit RIMM's, both 16-bit channels from the 850e chipset are run to a single RIMM slot correct??? Whats the benefit??? Originally, I thought that the 32-bit RIMMs would have internally dual 16-bit channels that would double the RIMM's bandwidth (ie PC1066 would get 4.2GB/ps per each chipset channel), and they would eliminate the need for a dual channel 850 chipset, but that doesn't quite make sense, but there still are some unanswered questions that I have. Like really what is the benefit or difference with 32-bit RIMM's? Other than not neededing to install them in pairs, I don't see the benefit. The Chipset still needs to be a dual channel chipset correct??? 2 pairs of 16-bit traces still have to be run from the chipset to the ram correct???
3: What exactley does the term "Dual Channel" mean??? What is the difference between Dual Channels and say 2 interleaved memory controllers like what nForce may be?

Thanks guys for any info you can provide🙂