ADATA XPG SX930 (120GB, 240GB & 480GB) SSD Review: JMicron JMF670H Debuts
by Kristian Vättö on July 16, 2015 10:00 AM ESTRandom Read Performance
For full details of how we conduct our Iometer tests, please refer to this article.
Random read performance is quite average and only Samsung has a notable advantage in this field, which is partly due to 3D V-NAND and its lower latencies.
Power consumption is on par with the BX100 and even though the BX100 has a slight performance advantage, the SX930 is very power efficient in random reads.
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Performance scaling could be a little more aggressive especially at QD4 and QD8, but overall random performance appears to be suited for the product.
Random Write Performance
Random write performance is mediocre and especially the 480GB SKU could use a boost to be more competitive. Fortunately power consumption is quite low, so the overall efficiency is decent.
Given the pseudo-SLC cache, one would expect performance scaling to be more aggressive from low to high, especially at QD4 and above, but there leaves an element of wanting compared to other high-end drives on the market.
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sonny73n - Sunday, July 19, 2015 - link
Oh really? Was it another firmware update for the 840EVO? When? I just threw my 840EVO out about 5 days ago after 2 firmware updates this year which did not fix the problem. The last update I had, Samsung had some kind of optimization in "Magician" (lmao) by moving all the old data to new blocks. Yeah ok, I had that 250GB EVO filled with about 190GB. It took like forever to finish and the optimization had to be run frequently in order to keep the 840EVO runs near advertised specs."Vitriol" or whatever, I would take any SSD with JMicron controller over the 840EVO in a heart beat. At least I wouldn't feel like being cheated out of paying for something that it's clearly NOT!
I'm thinking anyone that purchased the 840EVO should get together and file a class action lawsuit on Samsung for faulty advertising, consumer fraud or something like that.
voicequal - Monday, July 20, 2015 - link
Can you get a replacement under warranty?Oxford Guy - Sunday, July 19, 2015 - link
"Samsung has made 1 slip-up that was fixed with a firmware update."False. The 840 and 840 EVO drives reportedly have a permanent TLC-caused flaw. The only thing Samsung has managed to do, last I heard (and that was two "fixed" later) is re-write the data over and over again to paper over the problem.
The TLC is too weak to avoid voltage degradation so data needs to be rewritten to prevent massive slowdowns in read speed. I don't think Apple has ever bothered to release anything to fix the Samsung OEM drives they put their brand on either.
Oxford Guy - Sunday, July 19, 2015 - link
Interestingly, too, Apple decided to dump TLC, at least for its mobile line, sometime ago -- citing the inherent flaws. One could look at that move as being part of their feud with Samsung but I doubt that was the main motivation.zodiacfml - Sunday, July 19, 2015 - link
that's what truly happened. it only worked good when it was new.jabber - Monday, July 20, 2015 - link
Running SATA II? Buy the cheapest Kingston V300 as it will push 275MBps all day long.Running SATA III? Buy a BX100 and be done with it.
Saiyan32 - Sunday, November 27, 2016 - link
the firmware update really did the trick .. it has improved by a lot... I request anandtech to another review on this....