Cause of crushing ; Any guess?

Hi,

Somehow I build two rtl3.2-rc1 2.4.27 kernel.
(thanks to hofrat!)
First night it run with one module 0.5msec(500usec)
interval signal generation.
Simple 2kHz rectangular wave form alone.

I coud do anything switchin to Xwindow to consoles
and runing find command to serach thru all H.D.

After that I apt-get installed some apps like
KDevelps and Qtdesigners and other programs.

Now it crushes if I generate the same waveform at 
same rate. It last for few tens of seconds possibly
but depending on the occasion, it halt and does not
respond anything. 

One more PC, which I made xconfig more options.
It halted so quickly that the insmoding the *.o file
stopped PC. It workded only when I extended the
time constants to be 1msec or longer.

So I re-installed and made xconfgured more or less
like defaults except CPU type.
It became more lasty than before but it quits working
at the rate of 0.5msec frequency, unlike the other's
primary state.

So I changed the frequency less so the second PC
works for longer time and observed for a while.
Then I switched Xwindow to terminals and at the moment
I switch back to Xwindow it halted again.

I noticed this second one got more work to do because
of larger area on screen (1280x1024 v.s. 1024x768 at the
primary PC)
Also I partitioned 80GB for this second PC.
Only 20GB for the first one.

I am quite happy with 1msec frequency which first PC
can handle with no problem at all, thogh, I wish to 
run faster to have better safe margin.

Anyone could suggest anyhing on the better (faster)
performance on this kernel stability related to the
configurations of the PC itself?
(As far as my case is concerned the first one is
 Celeron and 500US$ price and Second one 1000US$ with
 Pentium 4. so it tells me to buy the cheapest....)

Thank you for your attention.

P.S. 
Any suggestion to test the performance without let 
PC to crush? 

Wathavy.

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