Xvid Video rendering rate keeps dropping

[medp7060]

I found that the video rendering rate decreases after a few min dramatically when my laptop is on a docking station,it does not drop if not on.
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However, the CPU usage does not change much ~90%
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[AnonCrow]

Without more info, one can only guess that some BIOS setting lowers the CPU speed when docked.
Assuming the dock&laptop cooling vents have been cleaned recently to prevent overheating.

[Asmodian]

Assuming the dock&laptop cooling vents have been cleaned recently to prevent overheating.

I bet this is the problem - overheating - does it get pretty hot?

[medp7060]

It is a quite new Laptop, so the fan is clean. The gap between dock and laptop is bigger on the dock than that between desk and laptop when not in dock.

What i do not understand is why the cpu and momery usages remained almost the same while the rendering rate dropped sharply, even below 1 fps.

[Asmodian]

It is a quite new Laptop, so the fan is clean. The gap between dock and laptop is bigger on the dock than that between desk and laptop when not in dock.

What i do not understand is why the cpu and momery usages remained almost the same while the rendering rate dropped sharply, even below 1 fps.

My guess is that as it gets hotter the laptop automatically throttles the CPU to slower speeds causing the CPU usage to be the same but the encode be much slower. This is a standard feature of modern CPUs as slower is better than crashed.

It could also be a utility in-accurately deciding you are not using the system so throttling back the cpu to save power. The slowing down of the system over time makes me think it is heat though.

You can run CPUz (goggle it) to check your current cpu speed, voltage, etc. RealTemp is good for checking your CPU temperature.

[medp7060]

You are right, Asmodian, see the picture below. So the solution is to get a fan to cool it down! Thanks a lot.
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[GrofLuigi]

medp7060,

Penryn is a very cool (literally ;)) processsor at 25 W, it shouldn't be doing that under normal circumstances.

I'm undervolting mine additionally and never seen any problems. Core VID 0,925 V at all multipliers :D, stress tested.

When doing that, I must turn off normal XP's power management or else it interferes or locks up the computer (and I'm increasingly suspicious that the power managment driver - intelppm.sys - has some flawed logic, maybe even under normal circumstances?).

But, in agreement with Asmodian's reply, I think you should really check the hardware throughly (even maybe open it if you can). Top hardware reasons for laptop overheating in my experience are:

1. Clogged fans and air passages (even after short time of usage).
2. Bad design (crammed interior)
3. They forgot to remove some sticker or packing material or similar (you wouldn't believe how often it happens).

HTH

*Edit: I didn't read all posts properly, now I see it's a docking station. But I think it still can be blocking some openings, no matter how small the looked like, maybe on the sides?

GL