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[Techspot] Intel's upcoming high-capacity SSDs reportedly run hot, require a heatsink - Page 4  

post #31 of 35
Quote:
Originally Posted by Raghar View Post

Which is a reason why I compared a HDD with HDD and SSD with a SSD.
Watt/transmitted byte = const (for SSD)
Thus a fast SSD eats more power.

If a Watt/transmitted byte is constant, then a 10MB/s write would use about the same power for a 'fast' and 'slow' SSD.

If you are saying a 'fast' SSD uses more power because it is doing more, than that is not fair comparison because you are not holding work constant.

Quote:
Originally Posted by Raghar View Post

Do you have figures for a leakage? I guess 20 nm, or less NAND leakage would be non negligible.
Leakage as a percentage of total power usage increases on smaller and immature processes. However, the overall power consumption decreases.

NAND data is hard to find but look at CPU data. Smaller processes for CPU use less power.
Quote:
Originally Posted by Raghar View Post

Then there is also problem with load leveling which is significantly more used in 20nm and smaller SSD. So it's not only read write, but also SSD maintenance which eats these watts.
Load leveling has nothing to do with NAND processes. Load leveling just distributes writes across the NANDs. Do you mean error correcting code (ECC)?

Why would a smaller process increase SSD maintenance?

Quote:
Originally Posted by Raghar View Post

How these NAND bank chains looks like at larger drives? Does controller have more channels, or are they chaining more banks? Former simply means bit more power demanding controller, the later means automatically higher power consumption because more banks are activated.
So lets compare Samsung 840 EVO. (which is definitely not a performance drive)

250 500 1000
start 1.54 1.52 1.59
read 2.80 2.75 2.78
write 2.63 2.70 2.86
Considering the write is most taxing, it should show differences the most.
Most controllers have 8 channels. Intel's old controller had 10 and there are a few cut-down controllers derived from the 8-channel models with 4-channels.

What does the scaling of the EVO prove? While there is an increase, it does not scale up that fast.

Quote:
Originally Posted by Raghar View Post

These are PCI-E drives, which are completely different kettle of fish. PCI-E are fast and overdimensionated.
No, PCI-E SSDs are generally utilize the same controller(s) with a PCIe storage controller/bridge. They are actually not very different at all.
Quote:
Originally Posted by Raghar View Post

Full of capacitors load balance, and stuff for faster writing.
Capacitors are not for load balancing. They are to allow time to flush volatile memory to NAND in case of sudden power loss. They do not contribute to power consumption since they just store electricity. SSDs with caps do consume a few watts more ONCE during charging.

The "stuff" for faster writes would be DRAM for write-back caching.
Quote:
Originally Posted by Raghar View Post

Also PCI-E is supposed to provide 75W of power, thus they don't have power restriction of normal SSD drives.
Do you know any recent normal drive that consumes 25 W?
What does the power restriction of PCIe matter?

SATA can provide about 30w per plug since: (1.5A*3.3v)+(1.5A*5v)+(1.5A*12v)

....that's the point of this.... do you know of any recent SATA/SAS SSD or HDD that draws 25w? Also, do you know if server bays are certified to accommodate multiple 25w drives?
Edited by DuckieHo - 12/4/13 at 10:19am
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post #32 of 35
lol, has intel made anything in recent months that hasnt run hot?
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post #33 of 35
Quote:
Originally Posted by DarkBlade6 View Post

TDP =/= Power consumption ....... doh.gif Take Sandy bridge and Haswell CPU for exemple they have the same TDP but Haswell clearly consume way much less energy, both run about at the same temperature when not overclocked.

TDP is a proxy for average normal use power consumption since solid-state electronics like CPUs are pretty efficient heat engines.


Sandy Bridge vs Haswell is a poor example: http://www.anandtech.com/show/7003/the-haswell-review-intel-core-i74770k-i54560k-tested/2

Haswell is on a smaller process.
Haswell has more aggressive, faster, and finer power gating.
Haswell motherboards use less power.
Haswell has a "Fully Integrated Voltage Regulator".


You can compare temperatures if all things are not held equal. i.e. A 100w 10x10mm device will be hotter than a 150w 30x30mm device.
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post #34 of 35
Quote:
Originally Posted by DuckieHo View Post

TDP is a proxy for average normal use power consumption since solid-state electronics like CPUs are pretty efficient heat engines.


Sandy Bridge vs Haswell is a poor example: http://www.anandtech.com/show/7003/the-haswell-review-intel-core-i74770k-i54560k-tested/2

Haswell is on a smaller process.
Haswell has more aggressive, faster, and finer power gating.
Haswell motherboards use less power.
Haswell has a "Fully Integrated Voltage Regulator".

You can compare temperatures if all things are not held equal. i.e. A 100w 10x10mm device will be hotter than a 150w 30x30mm device.

The thermal design power (TDP), sometimes called thermal design point, refers to the maximum amount of power the cooling system in a computer is required to dissipate.

TDP = heat, not power consumption.
Edited by DarkBlade6 - 12/5/13 at 1:22pm
post #35 of 35
Where does all of that heat come from? You can't magically make enegy appear, and 25W of electrical energy easily converts into that much thermal energy.
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