Openbox running hotter than kde4.4

I put this in newbie 'cos I obviously don't know what I'm doing.
I've got an IBM T41 laptop, some five or six years old, running the latest arch i686 with vanilla KDE4.4 and openbox.
Idle KDE temp: 36-38°C
Idle openbox temp: 44 - 48°C
I checked top and X was the main culprit in both cases - with compositing in KDE and no compositing in openbox.
Am I going mad? What to check next?

'cos
This made sense:
stefanwilkens wrote:are you using any form of power management at all while in openbox? I'm no KDE user, but I guess that cpu scaling tools and such might come with KDE... it does not when using openbox.
So I read this which did the trick for CPU scaling.
The fan is blowing at anything above 30°C and I'm running at 33°C Installed tpfand but haven't made any inroads yet. The fan is so quiet anyway... (read me being lazy/deaf)

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AHHHHH !!!

jariko wrote:
...I bought all hynix brand (2gb x8=16gb) as the apple site says to keep them all the same brand.
When I first installed, the system read that I only had 8GB. I powered down, took out the slot, reinstalled, restarted and now it is showing 14GB. It is staying at 14gb no matter what I do. I have tried switching the RAM to different slots. Also I noticed that when I would open the MP, the RAM chips are so incredibly hot that I have to wait for them to cool before trying to take them out. So my questions are:
1.) When you upgrade RAM, is the system supposed to run hotter? I've read the answer is yes...but is this safe for my computer?? I can only imagine what would happen if I had bought the 32GB 800mhz. I dont want to burn up my system. what is the average temperature that my computer should be running?
2.) Why is my system only recognizing 14gb when I installed 16gb? It is reading the RiserB's DIMM1 and DIMM2 as only 1GB. Does this have to do with the CPU overheating/overworking?
AHHHHH !!!
Who did you buy the DIMM's from and did they certify them as meeting Apple's thermal specifications? Does the vendor offer a lifetime warranty?
Apple has much stiffer thermal requirements than the typical PC maker does, and that includes the proper heat sinks to draw heat away from the DIMM. If those heat sinks are skimpy or not present at all, the DIMM's will run hot. For example take a close look at these DIMM's and you can see heat sinks clamped to the surfaces of the DIMM's that draw heat away from the chips and into the air flow from the Mac Pro's fans. I can't say what substituting the slower DIMM's for the correct RAM does regarding heat but it's good practice to install what the manufacturer specified.
Open System Information (Apple Menu with the Option key down) and select Memory in the Hardware group. You should see all the installed DIMM's and their status.

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