> I've heard reports from Athlon users who also say HLT doesn't
> do anything regarding temperature for their systems. I wonder
> if it also has a similar feature tucked away in an MSR somewhere..

I think I can confirm this:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 4
model name      : AMD Athlon(tm) Processor
stepping        : 2
cpu MHz         : 1009.015
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow
bogomips        : 2011.95

tranquil:~# uptime
 09:57:59 up  4:42,  2 users,  load average: 0.00, 0.00, 0.00
tranquil:~# vmstat 1
   procs                      memory    swap          io     system         cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
 0  0  0      0 601324  55064  57588   0   0     5     4  102    52   0   0 100
 0  0  0      0 601324  55064  57588   0   0     0     0  106    66   0   0 100
 0  0  0      0 601324  55064  57588   0   0     0     0  104    57   0   0 100
 0  0  0      0 601324  55064  57588   0   0     0     0  106    63   0   0 100
 0  0  0      0 601324  55064  57588   0   0     0     0  104    57   0   0 100
 0  0  0      0 601324  55064  57588   0   0     0     0  104    65   0   0 100

tranquil:~# sensors | tail | egrep 'CPU|Mobo'
CPU fan:  6308 RPM  (min = 3000 RPM, div = 2)                     
Mobo Temp: +30.0°C  (limit =  +60°C, hysteresis =  +50°C)        
CPU  Temp:   +49°C  (limit =  +67°C, hysteresis =  +60°C)        (beep)


With kernel compile it goes to 52 degrees, which makes 3 degrees 
difference between almost 100% idle and almost 0.0% idle. 
This is with kernel 2.4.10-ac10 if it matters.

	Ookhoi