SSD for PBP

[Luke]

Sorry, I don't remember who wrote that it was 2.5W, or have a link to that post.

TL wrote it - so its accurate.

[zaius]

Sorry, I don't remember who wrote that it was 2.5W, or have a link to that post.

TL wrote it - so it's accurate.

Thanks, Luke, I PM'ed him and haven't heard back.

So at this point we need better information.  We know it can handle 2.5W continuously, and a momentary peak of 8.25W, but we don't know how much power it can handle between those values for what period of time.  I'm guessing this is related to heat and what else is drawing current, since capacitance is likely insignificant.

From looking at a number of SSD's, they all idle well below 2.5W.  But so far, they all use more than 2.5W when R/W.

Btw, if the project would like any help writing things up, I'm happy to volunteer

[Luke]

Sorry, I don't remember who wrote that it was 2.5W, or have a link to that post.

TL wrote it - so it's accurate.

Thanks, Luke, I PM'ed him and haven't heard back.

So at this point we need better information.  We know it can handle 2.5W continuously, and a momentary peak of 8.25W, but we don't know how much power it can handle between those values for what period of time.  I'm guessing this is related to heat and what else is drawing current, since capacitance is likely insignificant.

From looking at a number of SSD's, they all idle well below 2.5W.  But so far, they all use more than 2.5W when active.

Btw, if the project would like any help writing things up, I'm happy to volunteer

Endless amounts of writing to be done - please PM me and we'll figure out what could work.

[Arwen]

My current desktop has 2 NVME drives in it, both from HP.
Here is an extract from Smart which has indications of power usage;

Code:

Model Number:                       HP SSD EX900 120GB
Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
0 +     9.00W       -        -    0  0  0  0        0       0


Model Number:                       HP SSD EX950 512GB
Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
0 +     9.00W       -        -    0  0  0  0        0       0
1 +     4.60W       -        -    1  1  1  1        0       0
2 +     3.80W       -        -    2  2  2  2        0       0
3 -   0.0450W       -        -    3  3  3  3     2000    2000
4 -   0.0040W       -        -    4  4  4  4     6000    8000

Based on that information, I'd say the HP EX900 120GB would not be compatible with the Pinebook Pro.

However, if it were possible to limit the power state of the HP EX950 512GB to state 2 / 3.80W max, then I would feel more confident using that type of device on a Pinebook Pro.

Power states 3 & 4 for the HP EX950 512GB appear to be standby.

Just finished a web search to see if either drive had a firmware update, and it appears not. So my comment about the HP EX900 120GB not being compatible is probably accurate, (but only in my opinion).

Anyone else have NVME drives that they would care to share Smart output from?

[lot378]

Code:

Model Number:                       Samsung SSD 970 EVO 250GB
Firmware Version:                   2B2QEXE7

Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
 0 +     6.20W       -        -    0  0  0  0        0       0
 1 +     4.30W       -        -    1  1  1  1        0       0
 2 +     2.10W       -        -    2  2  2  2        0       0
 3 -   0.0400W       -        -    3  3  3  3      210    1200
 4 -   0.0050W       -        -    4  4  4  4     2000    8000

For this drive the maximum burst mode power consumption is 9.0W.

[zaius]

Thanks for posting the SMART readings.

I found the ex900 datasheet:

http://hp-ssd.com/img/pdf/ex900.pdf

According to it, the "Power (Mobile  Mark* 2007 Workload) —Idle: 680 mW (TYP) —max: 3.52 W (TYP)" and "Power Consumption (Typical) 250GB 2.99W Active power measured during execution of MobileMark*  2007 with DIPM (Device Initiated Power Management) enabled."

If anyone finds any other datasheet links, please post them in this thread.

[lot378]

May be we are overthinking the NVMe drive and trying to seek unicorns when there are no unicorns. May be there is a compromise in the form of an M+B key drive for example the WD Blue SN500 that uses 2 out of 4 PCIe lanes. It would meet the imposed power limitations/conditions.

https://www.wd.com/products/internal-ssd...e-ssd.html

Anyone have an opinion on it working in the M key adaptor for the PBP?

[thequux]

The Intel 660p seems to be that unicorn; cheap and 0.1W according to https://ark.intel.com/content/www/us/en/...2-qlc.html . That power consumption seems shockingly low, so who knows how accurate it really is, but one would *think* that Intel knows how to measure it properly.

[lot378]

In that specification, Intel may be being less than honest about the true idle power consumption figures. A claimed 25mW power consumption actually turns out to be 225mW with testing equipment and that is high compared with other NVMe drives. The idle power consumption is an important stat but peak power draw is unknown  - no information is provided about the state 0, 1 or 2 power consumption unless someone has one to hand?

http://www.thessdreview.com/our-reviews/...w-512gb/5/

[zaius]

The Intel 660p seems to be that unicorn; cheap and 0.1W according to https://ark.intel.com/content/www/us/en/...2-qlc.html . That power consumption seems shockingly low, so who knows how accurate it really is, but one would *think* that Intel knows how to measure it properly.

Thanks, it is only available in 2TB, 1TB, and 512GB.

Here is more information about the WD Blue SN500 which has a different edge-connector:

http://products.wdc.com/library/SpecShee...-00076.pdf

Here is more information about the WD Black SN750 NVMe SSD:

http://products.wdc.com/library/SpecShee...-00054.pdf

It looks like most manufacturers are using this https://bapco.com/products/mobilemark-2014/ or this https://bapco.com/products/mobilemark-2018/ which only runs on Windows.  If there is a similar testing application that runs under Linux on the PBP, that might help early SSD adopters share useful information.