Cpu usage by X (with more info)

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Hi All!

Anyone able to give me an idea where to look......

Sometimes when I start my desktop, System Monitor tells me that "X" is 
running at max CPU %-age.  Other times, "X" is 4th or 5th in the list (I 
selected the CPU column to put the highest users on top), using 1 or 2 %.

So, my question to you all:  What is "X" doing & how can I stop it doing 
whatever & keep my CPU chip cool?????  BTW, I have no idea what X is!!! 
  I've tried killing it & that usually kills my desktop; just now 
killing it caused the system to restart.

My system: uname -ar
Linux Fedora-Blue 2.6.30.10-105.2.23.fc11.i586 #1 SMP Thu Feb 11 
06:51:26 UTC 2010 i686 athlon i386 GNU/Linux

running F11 & kde installed from the F11-KDE-Livecd.

As ever, Thanks for any help!

Dave

Oooops, forgot to put in "top" o/p:

> Tasks: 128 total,   3 running, 125 sleeping,   0 stopped,   0 zombie
> Cpu(s): 53.6%us, 45.4%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.7%hi,  0.3%si,  0.0%st
> Mem:    510416k total,   451276k used,    59140k free,    22560k buffers
> Swap:  2047992k total,     2140k used,  2045852k free,   199012k cached
>
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>  1922 root      20   0 72224  30m 5748 R 69.5  6.1  15:45.70 X
>  2132 Dave      20   0  126m  33m  21m R 24.5  6.7   1:20.48 ksysguard
>  2088 Dave      20   0  259m  28m  18m S  2.6  5.6   0:03.76 kwin
>  2091 Dave      20   0  297m  24m  14m S  0.7  4.9   0:02.54 knotify4
>  2092 Dave      20   0  304m  37m  23m S  0.7  7.4   0:13.00 plasma-desktop
>    48 root      15  -5     0    0    0 S  0.3  0.0   0:00.85 scsi_eh_1
>  2116 Dave      20   0  274m  26m  17m S  0.3  5.3   0:01.81 krunner
>  2351 Dave      20   0 89924  19m  13m S  0.3  3.9   0:04.49 konsole
>  2369 Dave      20   0  2536 1076  828 R  0.3  0.2   0:00.48 top
>     1 root      20   0  2000  716  632 S  0.0  0.1   0:00.72 init
>     2 root      15  -5     0    0    0 S  0.0  0.0   0:00.00 kthreadd


& there's another 100 or so processes loafing around.....
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