OCZ Vertex 2 - 34nm NAND versus slower 25mm 64Gbit NAND

eva2000 · 15-02-2011, 01:51 PM

Was out of the loop regarding NAND developments and while visiting OCZ tech support forums was caught by surprise with several threads mentioning that certain capacity OCZ Vertex 2 ssds have switched from fast 34nm NAND memory to much slower 25nm 64Gbit NAND memory - almost 43% slower in writes on 120GB Vertex 2 with slower 25nm 64Gbit NAND memory!

Here's 3 threads to read to get up to speed folks.

Guru3d

Drives are now shipping with 25nm NAND. This is the next die shrink the industry has been preparing to move to. One effect of the die shrink is the traces being closer together. Because of this the NAND is not as robust as the previous generation in regards to the voltage needed for writes and erases. This made necessary a reduction in the rated P/E cycles. The most common P/E cycle rating being 3000 now instead of the previous 5000.

To still provide a drive with a reasonable life expectation the amount of NAND set aside for over-provisioning has been increased by a few GB. So, for instance on a 120GB drive, if you see an unformatted capacity of 115GB this is perfectly normal.

Any questions concerning the move to 25NM NAND as it relates to drive size should be asked in this thread. Any new threads started related to this will be closed with a link posted to this thread. Also, please remember this is the support section of the forum. If you have a suggestion or complaint about the use of 25nm NAND use the appropriate section of the forum for those posts. Any post of a non-technical nature in this thread will be removed. Thanks

I understand when price of 34nm NAND rises or they are EOL, that replacements are needed, but to still badge them under Vertex 2 name isn't the right move. They should do what they did with Agility series, slower alternative NAND were pushed to Agility/Agility 2 series and make a new line for slower 25nm NAND memory

Maybe EOL the Vertex 2 name ? Or add revision number to it ??

What do you guys think ?

scottath · 15-02-2011, 03:21 PM

I bought a vertex 2 60gb today and its one of the "E" drives.
i never noticed until i saw this article/thread.

im confused now as to where to go.....
my drive has a formatted capacity of 51.24gb.

The drive is in my laptop (older laptop, sata1 i think for a start) so performance isnt exactly paramount - but its still crap that there is this form of "false advertising" happening........

I bought the vertex 2 as it was one of the fastest drives around, and now ive ended up with something that can be up to 45% slower than (falsely) advertised.......

also involves a reduction in the P/E cycle rating. thus it will die quicker ???? once again - false advertising?

where does this leave me.....????

Attached Atto and AS SSD benchmarks: Laptops SB is the SB600 chipset

eva2000 · 15-02-2011, 04:10 PM

ouch you bought it today... hurry back to store for a refund or exchange maybe ? or follow ocz instructions at http://www.ocztechnologyforum.com/fo...OCZ-SSD-drives to pay for upgrade to 25nm 32Gbit version ? not sure if that only gives more disk capacity or if performance is still slower ?

Looks pretty low there performance wise.

seems news of this is starting to really spread http://www.google.com.au/search?q=ocz+vertex+25nm

scottath · 15-02-2011, 04:41 PM

only have a return at the store - and thats at a 15% cost.....
other option is an additional $10 + shipping.....what a rip esp when there was no saving over current prices of the other models.....

from that thread too - it would seem that there is no real performance difference either - just a slight size increase......hmm - screwed or screwed.
lucky this is for my somewhat aging laptop and not my sig rig or id be mega upset - im still a little pissed off though.

re-running all the tests with it in my gaming system now to see how slow it really is.....

EDIT: attached the tests from within my gaming system - quite a bit better but still lacking over some of the reviews i looked up.

eva2000 · 16-02-2011, 02:10 AM

Yeah you're caught between 2 unfavourable options although 15% restocking fee is cheaper way. Or you could honestly explain to retailer the device isn't fit for it's purpose linking to the comparison result thread i posted and the web site ocz product page spec listing and demand a refund in full

Someone has highlighted another potential issue what of the revo/revo x2 units if they can unannounced 25nm 64Gbit NAND too http://www.ocztechnologyforum.com/fo...-REVO-X2-25-nm - that would really piss off folks forking out $$$$ for revo/revo x2 PCI-E devices as well!

scottath · 16-02-2011, 08:41 AM

found a review comparing the 25 and 32nm 60gb drives:
http://www.storagereview.com/ocz_ver...czssd22vtxe60g

looks like in the long run it will make little difference to my application of it in my aging laptop - but wont be getting (this gen) vertex 2 for my gaming rig

eva2000 · 16-02-2011, 09:13 AM

thanks for the link... wow even the packaging of the actual ssd went cheaper end

The new design makes use of a plastic cover and metal plate, where the older model had a metal body with a flat metal plate that screwed into place.

so went from 16x 4GB Hynix H27UBG8T2ATR MLC 34nm NAND to 8x 8GB Micron 29F64G08CBAAA MLC 25nm NAND

Just nasty

Don't agree with reviewers conclusion if your intended use in web/database server environments though.

scottath · 17-02-2011, 10:16 AM

Enabled ahci on the drive as a slave on gaming system. got much better results but still nothing like the claimed speeds / the old speeds.

Code:

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read :   180.831 MB/s
Sequential Write :    37.890 MB/s
Random Read 512KB :   174.938 MB/s
Random Write 512KB :    38.042 MB/s
Random Read 4KB (QD=1) :    17.659 MB/s [  4311.4 IOPS]
Random Write 4KB (QD=1) :    38.036 MB/s [  9286.2 IOPS]
Random Read 4KB (QD=32) :    51.710 MB/s [ 12624.4 IOPS]
Random Write 4KB (QD=32) :    38.103 MB/s [  9302.4 IOPS]

Test : 500 MB [K: 29.6% (15.1/51.1 GB)] (x5)
Date : 2011/02/17 11:14:14
OS : Windows 7  [6.1 Build 7600] (x64)

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