x100e PLL name and TDP question

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howto · #1 Post by **howto** » Tue Jan 04, 2011 10:13 am

General Question:
A CPU has a TDP of 20W at 1.8 Volt.
If it is undervolted at half Voltage 0,9 Volt, does this mean, it has the half TDP, 10W?

X100e specific question:
Does anybody know the name of the PLL on the X100e motherboard?

howto · #2 Post by **howto** » Fri Jan 07, 2011 2:06 am

I need a little help identifying the PLL.
Here are some HighRes pictures of the mobo, be careful, they are big:

#3 Post by **rkawakami** » Fri Jan 07, 2011 2:34 am

All other things being equal, I'd have to say "probably not". I don't think that the CPU will act like a fixed resistance when the voltage is lowered. I had to Google the acronym TDP and it returns "thermal design power". If this is what you are talking about, that has more to do with the fan/heatsink's capability to draw heat away from the CPU so that it doesn't exceed the specified maximum operating (junction) temperature. I think what you need is a graph of the power consumption for the CPU in question; in other words, what current the CPU is expected to draw at any given voltage (assuming that the clock frequency remains the same). From that you can determine how much power is being consumed (Voltage x Current = Watts).

And good luck trying to get the CPU to run at 1/2 the voltage it's spec'ed for. I'm not much of an expert in undervolting but I'd be surprised if the CPU is able to function at that low of a voltage. If 1.8V is the nominal condition, then I'd expect it to work maybe as low as 1.4V.

The Solutor · #4 Post by **The Solutor** » Fri Jan 07, 2011 8:42 am

rkawakami wrote: If 1.8V is the nominal condition,

Clearly is not.

Even the a64 on top of the line are working on the range of 1.3 1.4V

The Neos one are undervolted by default and are working @1.1V

The tdp mentioned on the first post is also wrong.

The correct values are 15W for the singel core model and 18W for the dual core models.

howto · #5 Post by **howto** » Fri Jan 07, 2011 10:37 am

I was speaking of "A CPU".
Not a specific CPU.
my voltages were only for better calculation.

The Solutor · #6 Post by **The Solutor** » Sun Jan 09, 2011 8:06 am

howto wrote:I was speaking of "A CPU".
Not a specific CPU.
my voltages were only for better calculation.

Ok, sorry for the misunderstanding.

BTW yes a processor downlvolted by 50% should dissipate roughly the 50% of the original power, but is not so simple a processor is not a light bulb is an active component with zillions of active and passive components so the above equation can't be applied precisely.

howto · #7 Post by **howto** » Fri Feb 04, 2011 4:02 am

The mv-40 is overclockable with SetFSB.
Clock Generator SLG8LP625T is working.

A user uploaded a video to youtube, with oced CPU and GPU:
http://www.youtube.com/watch?v=hilwtX4-eX0

For Gpu oc AMD GPU Clock Tool was used.

CPU clock was 1833 MHz
GPU clock 635 MHz
GPU memory clock 360 MHz

x100e PLL name and TDP question

x100e PLL name and TDP question

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