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Flash SSD vs RAM SSD Prices

Ratio of pricing - for enterprise FC SAN rackmount RAM SSDs to SLC flash SSDs

update by Zsolt Kerekes, editor

source - news stories and interviews on StorageSearch.com Note enterprise MLC - where available is cheaper than SLC. That's where things start to get complicated with the comparisons - because the cost of over-provisioning MLC to get the same reliability as SLC complicates the picture. And no type of flash SSD delivers the same low latency - even if the IOPS are similar to RAM.

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flash SSD Jargon Explained
RAM Cache Ratios in flash SSDs
Choosing the Wrong SSD Supplier
RAM v Flash SSDs - which is Best?
flash wars in the enterprise SSD market
Clarifying SSD Pricing - where does all the money go?
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The Changing Relationship of Flash & DRAM SSDs

by Jim Handy, Objective Analysis
... Objective Analysis profile
(published here August 2007)

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.
ram versus flash price predictions  - article on STORAGEsearch.com
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.
see also:-

SSD news
the Fastest SSDs
the SSD Buyers Guide
the Top 10 SSD OEMs
RAM versus Flash SSDs - which is Best?
SSD Myths and Legends - "write endurance"
Are MLC SSDs Safe in Enterprise Server Apps?
Z's Laws - Predicting Future Flash SSD Performance

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SSD Pricing - where does all the money go?
SSDs are among the most expensive computer hardware products you will ever buy and comprehending the factors which determine SSD costs is often a confusing and irritating process...
Clarifying SSD Pricing - where does all the money go? - click to read the article ...which is not made any easier when market prices for apparently identical capacity SSDs can vary more than 100x to 1!

Why is that? ...read the article to find out
...
Who makes the fastest SSDs?
Speed isn't everything. It comes at a price.
But if you do need the speediest SSD (chip, card, module or rackmount) then wading through the web sites of hundreds of SSD oems to shortlist products slows you down.

And the SSD search problem will get even worse as we head towards a market with over 1,000 SSD oems.
the fastest SSDs  sorted by interface and form factor - click to read article ... Relax - I've done the research. And this whizzy wish list is updated daily from storage news and direct contacts from oems. ...read the article,
...
the Problem with Write IOPS in flash SSDs
the "play it again Sam" syndrome

Flash SSD "random write IOPS" are now similar to "read IOPS" in many of the fastest SSDs.

So why are they such a poor predictor of application performance?

And why are users still buying RAM SSDs which cost an order of magnitude more than SLC? (let alone MLC) - even when the IOPS specs look similar.
the problem with flash SSD  write IOPS This article tells you why the specs got faster - but the applications didn't. And why competing SSDs with apparently identical benchmark results can perform completely differently. ...read the article
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