M4800 Owner's Thread

The Chinese Expresscard to NVMe adapter is on sale on Ebay:

https://www.ebay.com/itm/373793543649

It looks like the same model ???

Sabrent NVMe 2242 card can reach 2TB:
https://www.ebay.com/itm/283891157250

 

Hmm, interesting. Don't exactly have a use case for such a thing but cool nonetheless.

 

2242, so it should fit.

 

Do you guys think that it's possible to get full SSD performance out of the Express Card slot & Express Card to NVMe adapter?

 

No. ExpressCard just provides one PCIe lane. Modern systems with NVMe ports use four PCIe lanes. So, starting with one quarter the speed off of the ExpressCard slot.

Also, ExpressCard runs at PCIe 2.0 max, and PCIe 3.0 is the norm for NVMe (there are even some PCIe 4 drives out now). Each new version of PCIe doubles the bandwidth, so going from PCIe3 to PCIe2 means cutting the bandwidth in half.

So, PCIe3 NVMe drive in an ExpressCard enclosure will run at one eighth of the speed that it would in a modern system PCIe3 NVMe slot.

 

According to the Sabrent webiste, their 2242 NVMe card can reach 2500 MB/s speed.

Does that means, we can get 2500 / 8 = 312 MB/s speed ??
That's still pretty fast!


https://www.sabrent.com/product/SB-...less-low-power-internal-high-performance-ssd/

 

Still not as fast as PCIe x1 3.0 like some P-series ThinkPads have.

 

Hello guys,

After switching to 4940MX CPU, now my fans turn on when I use software like Android Studio.
My CPU usage is around 45% when android studio is running.
But my laptop is not hot at all...
How can I manually turn off fans?
I think it can turn on when the CPU usage hits 65% or 75%... not 45%.

The fans are quite noisy.

 

Use DellFanManagement
http://forum.notebookreview.com/threads/dellfanmanagement-dellfankeepalive-–-tools-for-managing-the-fan-speed-in-dell-laptops.833340/page-13#post-11123326

That's the sad part about using this cpu, or putting a more powerful cpu in this laptop.
EC keep the fan spinning with its own mind in long period of times before revving down despite the temperature being only 60-65c.
There seem to be no fan curve's or any intelligent fan control based on real time temperature like in other brands like HP or Thinkpad.
Fan control is primitive at best, only three level of control.
I mostly run the fans on medium even for hard loads, temps are just fine 86-87c unless you have all cores fully loaded

 

You can also disable turbo boost when you don't need it to keep the CPU cooler & fans down.
* Go to Windows advanced power settings and set maximum CPU frequency to 99%.
* Make sure power slider (click the battery taskbar icon) is set to the *middle*.
Ta-da. Turbo boost is disabled. To enable it just move the power slider to the right.
(...Then what's the point of buying the faster CPU? Still, I normally keep turbo boost off with this method when I'm not running a CPU-heavy workload.)