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[Various] 750 Evo Review - Page 3

post #21 of 65
scratch 750 off my list
I'm wish 3D xpoint was releasing to consumers this year instead of a few years

I thought controller failure starts around 600TB written
post #22 of 65
Quote:
Originally Posted by hhuey5 View Post

scratch 750 off my list
I'm wish 3D xpoint was releasing to consumers this year instead of a few years

I thought controller failure starts around 600TB written
controller doesn't have an endurance limit, or even if it does it'd last way longer than your life.

NAND write endurance though depends on the write cycles, each write cycle erodes the cells, after a certain amount of write cycles the cells will rupture and leak their charge.
in general, its a hit or miss, since not all NANDs are manufactured perfectly, but theoretically speaking they can last for a long time.
e.g. lets say a 256GB SSD has an endurance of 4000 cycles, MLC has 2bits per cell which makes it (( 256GB / 2 ) * 4000 cycles) = 500TB endurance limit.
Edited by epic1337 - 2/22/16 at 11:18pm
post #23 of 65
Quote:
Originally Posted by epic1337 View Post

controller doesn't have an endurance limit, or even if it does it'd last way longer than your life.

NAND write endurance though depends on the write cycles, each write cycle erodes the cells, after a certain amount of write cycles the cells will rupture and leak their charge.
in general, its a hit or miss, since not all NANDs are manufactured perfectly, but theoretically speaking they can last for a long time.
e.g. lets say a 256GB SSD has an endurance of 4000 cycles, MLC has 2bits per cell which makes it (( 256GB / 2 ) * 4000 cycles) = 500TB endurance limit.

I get the NAND part but don't get why the controller fails? a short circuit?
post #24 of 65
Quote:
Originally Posted by hhuey5 View Post

I get the NAND part but don't get why the controller fails? a short circuit?
firmware bug is the most likely culprit, otherwise probably a voltage spike or a thermal overload (overheating).
the controller is the same as a PC's CPU, the CPU failing is highly unlikely as its very stable so long as you run it within spec.
post #25 of 65
Quote:
Originally Posted by hhuey5 View Post

I get the NAND part but don't get why the controller fails? a short circuit?
Usually controller freaks out because of some reason and bricks itself.thumb.gif
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post #26 of 65
Quote:
Originally Posted by epic1337 View Post

you're forgetting that 750 EVO uses only 1NAND(120GB) and 2NAND(250GB), where as 840 EVO uses more than that.
in terms of endurance, it'll be notably less than 840 EVO, approximately half but thats still 200TB~400TB.


in terms of "worth", its priced $4~$6 below 850 EVO.
considering it's overall endurance is inferior, plus the drive's speed is also somewhat inferior, i don't see saving a mere $4~$6 would be worth it.

What has that to do with anything ? Thats just a packages. Within a package there are usually more dies stack on to each other (up to 16)
http://images.anandtech.com/doci/8522/Screen%20Shot%202014-09-11%20at%2022.13.21.png

840EVO and 750 have the same die density (128Gbit) so for a given capacity, they have the same parallelism. The only difference is newer controller and smaller fab nand.
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post #27 of 65
Quote:
Originally Posted by hojnikb View Post

What has that to do with anything ? Thats just a packages. Within a package there are usually more dies stack on to each other (up to 16)
http://images.anandtech.com/doci/8522/Screen%20Shot%202014-09-11%20at%2022.13.21.png

840EVO and 750 have the same die density (128Gbit) so for a given capacity, they have the same parallelism. The only difference is newer controller and smaller fab nand.

never heard of denser NAND has less endurance?
post #28 of 65
Quote:
Originally Posted by epic1337 View Post

never heard of denser NAND has less endurance?
Thats not what you were implying though.

By the looks of it, you were implying because 750 has less packages, it has to be less durable and slower. Which is absolutely not the case.
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post #29 of 65
Quote:
Originally Posted by hojnikb View Post

Thats not what you were implying though.

By the looks of it, you were implying because 750 has less packages, it has to be less durable and slower. Which is absolutely not the case.

i was implying that the much more denser and fewer NAND of 750 EVO would be inferior to 840 EVO which users sturdier and more NAND.
in theory, you can perform better channel interleaving with more NAND, which affects both performance and wear leveling.
post #30 of 65
Quote:
Originally Posted by epic1337 View Post

i was implying that the much more denser and fewer NAND of 750 EVO would be inferior to 840 EVO which users sturdier and more NAND.
in theory, you can perform better channel interleaving with more NAND, which affects both performance and wear leveling.

Except, thats not the case. Both drives use 128Gbit dies, so for a given capacity, they have the same parallelism and the same number of dies.
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