Intel 530 vs Samsung 840 pro
Posted 27 December 2013 - 08:02 AM
Posted 27 December 2013 - 09:42 AM
Intel and Samsung build both great SSDs, I personally don't like Sandforce, so I would go with the 840 Pro.
Posted 27 December 2013 - 09:55 AM
Thanks very much for the answer,
A lot of people do not like the SandForce controller, why? Another question, Samsung and Intel SSDs are the best or is there any other brand that produces quality SSD? I have read that Mushkin SSDs are very good, what do you think?
Posted 27 December 2013 - 11:55 PM
> A lot of people do not like the SandForce controller, why?
Evidently, when SandForce Nand Flash controllers were initially designed,
the designers were acutely aware that Nand Flash memory supports
a limited number of Program / Erase ("P/E") cycles before it fails.
At ~34nm, the number of P/E cycles with MLC was about 5,000.
At ~24nm, the number of P/E cycles with MLC was about 3,000.
At ~19nm, the number of P/E cycles with TLC is now about 1,000.
(We'll leave SLC (single-level cell) Nand Flash out of this discussion, because
that particular breed of Nand Flash is much more expensive
than MLC and TLC varieties.)
Therefore, SandForce controllers were designed to do real-time compression
of raw data output by a host controller, as a way of minimizing
the actual amount of raw data that is stored in Nand Flash chips.
The net effect of this design decision is that SandForce controllers
have historically performed noticeably better with raw data that is compressible,
and not as well with raw data that is incompressible.
The Nand Flash controllers in Samsung's SSDs do not perform real-time compression;
and, moreover, they perform equally well with compressible and incompressible data.
Another very annoying feature of certain firmware installed with early
SandForce controllers was a very abrupt and serious decline in performance
if the Media Wear Index ("MWI") reached zero before the end of the factory warranty period.
Presumably, that particular firmware logic was enabled to keep such SandForce SSDs
still running during their factory warranty periods, even though they should
have started to exhibit "wear-out" symptoms because of an excessive number of P/E cycles
that reduced MWI to zero.
For reasons like these, I have shifted away from SandForce SSDs in favor of Samsung's SSDs,
and I'm very interested in trying 2x or 4x Plextor M5 Pro 256GB SSDs in a RAID-0 array: consequently,
I don't know for sure whether or not current SandForce controllers still exhibit the latter problem.
In general, it is fair to say that Nand Flash SSDs benefit a lot whenever
superior "wear leveling" logic is implemented in their firmware, and
this is particularly true of MLC and acutely true of TLC Nand Flash memory.
Plextor's best M5 Pro SSDs also do very well "After 30 Min. Idle"
as reported by the excellent reviewers at xbitlabs.com :
Notice how widely those SSDs vary on that one metric.
Plextor's excellent scores can be very important on systems that do not support
the TRIM command, and particularly on RAID arrays that do not support TRIM.
In my own opinion, the industry needs to adopt a standard protocol
which executes the TRIM command on any and all RAID arrays of SSDs, e.g.
by using the "boot mode" that is supported in Windows and in third-party software
like the excellent freeware Partition Wizard: whenever the C: system partition
is checked by requesting the OS to "automatically fix file system errors",
Windows will schedule that task during the next STARTUP and
launch a "boot mode" task that takes exclusive control of that partition
before reaching the Windows Desktop.
Such a "boot mode" is an excellent place for TRIM commands to be issued,
perhaps on a User-defined schedule.
Edited by MRFS, 27 December 2013 - 11:58 PM.
Posted 28 December 2013 - 05:04 AM
Posted 28 December 2013 - 10:12 AM
I'd recommend that you consider Samsung 840 Pro, Plextor M5P Extreme and Corsair Neutron GTX.
Edited by MRFS, 28 December 2013 - 10:13 AM.
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