In a comment to a recent Memory Guy post I stated that NAND flash can reduce DRAM requirements, even in PCs. Some readers have told me that they wonder how this could be, so I will write this post to explain.
Some years ago Objective Analysis noticed that clever server administrators were able to use SSDs to reduce their systems’ DRAM requirements. Not only did this save them money, but it lowered power and cooling requirements as well.
Thinking that this might work on other kinds of computers, we commissioned a number of benchmarks to be performed on a PC.
These benchmarks found that after a system already has a certain minimum amount of DRAM, users can get a bigger performance boost by adding a dollar’s worth NAND flash than they can get by adding a dollar’s worth of DRAM.
In every case the minimum amount of DRAM was very small.
It seems that DRAM makers are still unaware of the impact NAND flash will have on DRAM revenues. Even though many are paying a lot of attention to the impact of the Tablet PC on Notebook PC shipments, few understand that even a healthy notebook market will start to place a decreasing focus on the system DRAM in the near future.
The reason why is simple, and it’s explained in great detail in a report: How PC NAND will Undermine DRAM. In a nutshell, once a basic minimum DRAM requirement has been met, NAND flash yields a greater performance return per dollar than does DRAM. This is illustrated in the graphic to the left.
Forget about the fact that NAND flash is nonvolatile, and that it offers Continue reading