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DDR2 Article at Xbitlabs.com

JSSheridan

Golden Member
Edit: Link to article

I spent some time reading over the article, which I think was very good. It explains how SDRAM works quite clearly. I also have some questions concerning the future of system memory. In DDR2 memory, 4 SDR inputs are multiplexed onto 1 DDR output at 2x the frequency. Will future memory work by multiplexing more than 4 inputs, either 8 or 16 at 4x or 8x the frequency, or is there another way to increase the performance of SDRAM. There is the ability to increase the actual clock of the memory cells, but that method is trivial (obvious.) I remember Via(?) was pursuing QDR memory modules back in '02, is that likely to be adopted? I imagine that the more SDRAM evolves, the more it will resemble RDRAM.

On another line of thought, what kind of research are we doing to find a replacement to DRAM? That's enough from me. Thanks. Peace.
 
DDR2 is a good start to faster memory with better responce times. Right now the performance of the DDR2 is not what it can be, the speed are relative to the PC3200 already out in the market. The future is here though and it will be only a short time before faster speed are reached.

Figure QDR to be dead. Nobody jumped on that bandwagon and without major manufacturer support it died. Motherboard manufacturers will not follow QDR because of the the different architecture. I have not heard too much about QDR so my info is limited.

As far as DDR2 resembling RDRAM it will never happen. The signal rise and fall of RDRAM versus DDR2 is totally different. RDRAM rises and falls every half cycle and DDR2 rises and falls on every cycle. With RDRAM there needs to be a termination chip installed if all slots are not filled, waste of money, and with DDR2 all slots do not have to be populated.

Just my thoughts.
 
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