Slice Battery Problem

1. You are using High Performance profile in Windows (or another profile that does not restrict CPU speed).

Confirmed

2. You load / stress the processor with software, e.g. Prime95 or IntelBurnTest, whilst monitoring the CPU clock speed.

IntelBurnTest (maximum stress)

and that:

3. Performance of the CPU is consequently much lower on the slice battery than if using the standard battery for the same test conditions.

On internal battery CPU @ 3.68

4. The CPU is allowed to run much higher on the standard battery with no changes made to the system or power profile.

Confirmed. All settings unchanged
----

Finally, which CPU do you have? Is 1.5GHz its lowest normal state? (My 3740QM uses 1.2GHz as its idle speed.)

Intel i7 3940XM; Idle @ 1.42GHz on IB

 

Krane,

Many thanks again. I will contact Dell in the morning and will hopefully get somewhere this time... I think this shows that there is a generic M4700 / M6700 issue with the slice battery. Hopefully they will give up their stance of wanting to replace my motherboard. I think that two M4700's and one M6700 exhibiting the same behaviour shows it isn't a one-off motherboard failure.

I will post again here when I finally have a solution / answer from Dell.

Regards,

Martin

 

Any further on this? I would like to purchase a slice but if I get heavy limited CPU use there is no point

Sent from my Nexus 4

 

i am bumping this thread up since i want to know too what came out.

 

I've got the same issue with the slice battery and cpu throttling on my m4700. I've just had my main-board replaced and the issue wasn't fixed.

 

According to what I've ascertained, that's just the nature of the CPU on battery power. Only this thread seems to indicate that it effects more than one particular model of CPU.

According to Notebook Check, the throttling will occur on the 3940XM even with the eternal battery after 20 minutes. But that may be a battery conservation feature?

 

All - any feedback from DELL?
It seems a BIOS problem .. related somehow to Dell's throttling of the speed for any non-standard power adapter.
This is my status
I have just installed a new Slice battery on M4700
Same problem:
Using 180W power adapter:- ramps quickly to 3.6Ghz
Using standard battery (65Wh): - ramps more slowly to 2.8Ghz then jumps to 3.6Ghz
Using lower (say 120W) power adapter: - either 1.0 Ghz or max 1.2Ghz if you try to fool it by plugging in the adapter during the boot process
Using Slice Battery (in addition to Standard): - Speed is fixed to a crawling 1.2Ghz - plug out the slice battery and it speeds up again

 

I guess when its on battery, its all about battery life? Still, I wish there was a user option since I'd like to be the one that decides this. It makes your higher power CPU useless. Imagine if your car was tuned like this.

 

Try throttlestop, it works to unthrottle when using smaller psu.