Цитата:
Сообщение от mrepik
обещаного 3 года ждут. да и дорого, блин
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Возможно, ждать действительно еще три года. До 2011-го.
The Changing Relationship of Flash & DRAM SSDs
by Jim Handy, Objective Analysis
It does us a disservice to compare SSDs made with DRAM and NAND in today's light and to assume that this is the way things will always be.
The greatest cost component of any SSD is its memory. Flash SSDs use NAND, and RAM SSDs use DRAM.
NAND has been on a steeper price decline than DRAM for its entire existence. The price of a gigabyte of DRAM declines (on average) 32% per year. There are indications that this decline may slow. Meanwhile, NAND's price per gigabyte declines faster, at an average of 50% per year. While NAND used to be more costly than DRAM, in 2004 it crossed below DRAM.
Today a gigabyte of NAND costs less than 1/3rd as much as a gigabyte of DRAM and the gap between the two is growing.
Large system makers, those most likely to use RAM SSDs, want to balance resources in their systems to get the greatest performance per dollar, and they are very likely to use three forms of mass storage in their systems: RAM, flash, and conventional HDD. Today, with the 3:1 price difference between NAND and DRAM it makes sense to use a certain amount of both technologies, but those amounts greatly depend upon the system's task.
By the end of 2012, when a gigabyte of NAND costs 1/19th as much as a gigabyte of DRAM, the optimum balance of flash/RAM will be very different.
System analysts and IT managers need to understand how their systems use disk storage in order to optimize their balance of flash to RAM. These users should perform their benchmarks in such a way that they can ride the downward trends in both RAM and flash pricing to get the highest performance for the lowest cost, taking advantage of the growing price delta between the two technologies.
Источник:
http://www.storagesearch.com/ssd-ram-v-flash.html