HDTach
HD Tach will test the sequential read, random access and interface burst speeds of your attached storage device (hard drive, flash drive, removable drive, etc). All drive technologies such as SCSI, IDE/ATA, 1394, USB, SATA and RAID are supported. Test results from HD Tach can be used to confirm manufacturer specs, analyze your system for proper performance, and compare your performance with others. HD Tach is very easy to use, quick, and presents data in easy to read graphs, including the ability to compare two storage devices on screen at the same time for easy analysis.
Bursts are provided only for your review. SSD's don't cache the same way HDD's do (in many cases they don't cache reads at all), so burst testing typically results in figures that are lower than the sequential throughput figures, unless the controller and flash is of exceptionally low latency. While Samsung and ADATA (Silicon Motion 2246EN) give great figures here, this test data does not directly translate into any particular real world performance result.
HDTach feeds the tested drive a continuous string of small sequential requests. This is a single threaded operation, which means the SSD doesn't get to see what's coming next. The lower the QD=1 latency of the controller pipeline, the better the numbers we see from this test. It doesn't necessarily equate to real-world maximum throughput, as typical file IO occurs at QD>1, but it does mean something for analysis and response times to single infrequent commands, which is why we include these results.
The 850 PRO shines here. Better throughput than any of the competition in this test. Of note is the ability to keep write speeds up near maximum even at the smallest capacity, which appears to lose only 5MB/sec (1%), compared to the other modelswhich show significant falloffs due to their limited die count and flash page write speed.
These new charts are not the
These new charts are not the easiest to read.
Slightly larger text and solid colored bars would help a lot.
I second this. I find them
I second this. I find them very hard to read. The bar charts are okay because they are all in order, but when they wonder around like the line graphs, they’re practically illegible. Add in the mislabeled axies and I’m not sure what I’m supposed to be reading.
Agreed.
Agreed.
Not the easiest graphs to
Not the easiest graphs to read!
Background color hinder very much.
It looks like you mislabeled
It looks like you mislabeled the X axis on the PCPer File Copy Test charts. I’m guessing it’s supposed to be “seconds” rather than “MB/s”.
Agreed. Also, i’m pretty sure
Agreed. Also, i’m pretty sure that for the “IO Meter Average Transaction Time” lower – not higher – should be better.
Thanks for the catch, I’ve
Thanks for the catch, I've re-uploaded corrected versions, and expanded the QD out to 8 on these to more easily see where the drives are headed. Expanding it further would make the lower part of the scale harder to read.
Yeah, I almost went out and
Yeah, I almost went out and bought an ADATA SP610 in 128GB. 🙂 That thing beat everyone!
Got it. Fixed the axis label
Got it. Fixed the axis label on file creation and copy charts. Thanks for reporting this.
Look at how much extra room
Look at how much extra room is available in that 2.5in casing for the 512 and 1tb models! Going with full 16 layer packages and filling up the remaining space with them could yield a 2.5 inch SSD in excess of 3TB. O_O
This tech needs to hurry up and get fully commoditized so Samsung has an incentive to make drives that size and we can actually buy them at reasonable prices. Doing so would put a few more well earned nails in the HDD makers coffins.
hey Allyn when are you
hey Allyn when are you getting the intel 750 pci-e ssd? supposed to be out in Q4 and well… its Q4 now!
Possible error with the YAPT
Possible error with the YAPT chart. Shows queue depth on the bottom when it should be block size(or whatever the correct term would be). Regardless, interesting new benchmark along with a great article.
Fixed, and thanks!
Fixed, and thanks!
I’m wondering, can these
I’m wondering, can these drives perform any faster if connected to 12gb/s SAS ports?
The controller and connector
The controller and connector do not support SAS 12Gbit/sec. Even if connected to an appropriate HBA, the link would fall back to 6Gbit SATA.
As usual I’m late to posting
As usual I’m late to posting comments, but in case anyone notices my post: I have not found any source at Samsung or here where it addresses some sort of “hold-up” protection on the power line in case of a PSU failure. Anyone know?