Samsung SSD 840 Pro (256GB) Review
by Anand Lal Shimpi on September 24, 2012 7:00 AM EST- Posted in
- Storage
- SSDs
- Samsung
- Samsung SSD 840
Performance vs. Transfer Size
ATTO is a useful tool for quickly measuring the impact of transfer size on performance. In order to focus on areas of noticeable difference I cropped out the larger transfer sizes. You can get the complete data set in Bench. Unlike some recent SSDs, the 840 Pro doesn't sacrifice small file performance at all. The graphs below show fairly strong performance regardless of transfer size. Note the particularly strong showing of the 840 Pro in small file reads, an area where many competing drives typically fall short.
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kensiko - Monday, September 24, 2012 - link
Interesting!Can Anand comment on that? Or verify it?
jb510 - Monday, September 24, 2012 - link
Same question. How do the Samsung provided numbers comparing the 830 to 840 on page 1:Active Power Use 0.24W 0.068W
Idle Power Use 0.14W 0.042W
Jive with the actual test numbers?
Guspaz - Monday, September 24, 2012 - link
I must be missing something, but on the first page, the rated power usage is:Active Power Use : 0.068W
Idle Power Use: 0.042W
While the actual measured use is 0.31W for idle and over 3W for active. That's about 50x higher, what's going on here?
btb - Monday, September 24, 2012 - link
Yeah, and no measurement of read power usage. Even though the typical user probably do an order of a magnitude more reads than writes. But thats a general anandtech testing problem, too much focus on the write specs instead of the more important read specs.ssj3gohan - Monday, September 24, 2012 - link
See my comment above here: Anandtech measures the power consumption wrongly. DIPM is not enabled, which causes ridiculously much higher power consumption.krumme - Monday, September 24, 2012 - link
The Anand hd bench was an excellent tool for comparisons, and one of the great tools Anand provided for us for delivering bm that reflected real world usage.What i derived from the first 2010 results was that the samsung disk was bad, but not so bad as it was portrayed by the reviewers and Anand. They were not worth their money, but they were slammed way to hard. At that time if we look at fx. strartup times, they were practically as fast as the fastest, so the criticism was ok, but a tad overblown.
At that time many producers was as Anand said, not focusing enough on random 4k, but i can say for sure, nothing but random 4k write was usable here at anandtech at that time too :)
sheh - Monday, September 24, 2012 - link
As usual, I'm curious about the data retention properties of drives, and how they change across a drive's lifespan as P/E cycles increase. It would be difficult to check directly, but perhaps the manufacturers can reveal the details? I also wonder if TLC will be disastrous in this regard.Kristian Vättö - Monday, September 24, 2012 - link
I asked about that in the Q&A session we had with Samsung engineers today but unsurprisingly, they couldn't tell us specific numbers. I hope to get my hands on 120GB 840 and 128GB 840 Pro to see what's the write endurance like, though that will take a while to test.FunBunny2 - Monday, September 24, 2012 - link
It looks like even the Pro has no standby cap? How can that be anything better than a toss away consumer drive?sheh - Monday, September 24, 2012 - link
They couldn't/wouldn't give numbers on P/E cycles or retention time?If you have a secret AnandTech stash of P/E exhausted drives (or could create one :), how about checksumming everything and testing every few months?