Review Intel SSD 665p M.2 NVMe SSD Review: QLC Flash Refined

levijonesm

Prominent
Jun 10, 2018
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Hi Sean, may I ask how the direct-to-QLC write speed of 185 MB/s was calculated? From the graph "Sequential Steady State Write Workload", I see 287 GB written after 15 minutes. This works out to 319 MB/s.

Also, in your review of the 660p here, the sustained write speed of the 660p seems to be 175 MB/s (not 125 MB/s mentioned in this review). Just some points of clarification please. Thanks.

A direct-to-QLC speed of 185 MBps is perfectly acceptable to me, once the price drops a bit to 660p levels. The improvements in cache recovery and power efficiency are welcome too. Thanks for the very good review.
 

seanwebster

Contributing Writer
Editor
Aug 30, 2018
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Hi Sean, may I ask how the direct-to-QLC write speed of 185 MB/s was calculated? From the graph "Sequential Steady State Write Workload", I see 287 GB written after 15 minutes. This works out to 319 MB/s.

Also, in your review of the 660p here, the sustained write speed of the 660p seems to be 175 MB/s (not 125 MB/s mentioned in this review). Just some points of clarification please. Thanks.

A direct-to-QLC speed of 185 MBps is perfectly acceptable to me, once the price drops a bit to 660p levels. The improvements in cache recovery and power efficiency are welcome too. Thanks for the very good review.
I write to the drive after a secure erase with iometer - 128KB sequential workload @QD32. I average the cache speed before performance drops and then after it drops I average the remaining writes. (the charts seem to be mixed up slightly - check the last iometer charts for the rest of the write saturation charts until it gets fixed - there you will see the write cliff and better understand the cache)

The 660p review you are referring to is the 2TB model. We don't have the write saturation chart on the 1TB 660p review because it was added into the performance testing in later reviews (along with some minor adjustments here and there). I included the missing data from the 660p review here, and it is included now in various other reviews I've done since. It has a slower base write speed than the 2TB model after its cache exhausts. The 1TB 660p has a base write speed that hovers around 110-130 for the most part.

We should be getting the 2TB 665p in the coming weeks so, it will be interesting to see how it has improved as well.
 

thisisaname

Distinguished
Feb 6, 2009
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While 287 GB/900 seconds is 319MB/s he was talking about direct-to-QLC speed so you remove the first 142MB 120 seconds ( the filling of the cache) the sum becomes 143 GB / 780 seconds giving 185.9MB/s
 

dimar

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Mar 30, 2009
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Shouldn't you say 5 years or 300TBW /600TBW warranty, whichever comes first? Would Intel service the drive if it gets to the TBW point?
 

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