Asiatic :
Q. i got a dual 3.6 ghz xeon along with NCCH-DL motherboard of Asus. the problem is when i run CPU Id on Vista it says Xeon and on XP OS it says P4 HT.
That is possibly because XP and Vista use different strings in the CPUID flags to identify the CPU. I'll use my file server's 2.66 GHz "Prestonia" Xeons as an example.
Here's the full CPU info output from one CPU (there are four since there are two CPUs w/HyperThreading enabled, but they're identical save for the physical ID and APIC ID numbers.)
[cpp]user@localhost:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Xeon(TM) CPU 2.66GHz
stepping : 9
cpu MHz : 2657.881
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pebs bts cid xtpr
bogomips : 5315.76
clflush size : 64
power management: [/cpp]
The important parts here are the model name, CPU family, model, and stepping. If the OS looks at the model name, it will see the CPU as a Xeon. If the OS looks at the vendor ID/family/model/stepping, the OS sees the flags for a 130 nm NetBurst CPU (GenuineIntel 15-2-*). Xeons are a lot less common than P4s, so the OS that uses this method would call the CPU a P4 Northwood rather than a Prestonia Xeon. The reason the OS uses the CPUID flags instead of the model name is that there are are a lot of Xeons with different instruction capabilities. A PII-based Xeon will not be able to execute SSE2 code for example, while a Nehalem-based Xeon will be able to do that as well as SSE3, SSSE3, and SSE4.1/4.2. The flags can't tell the difference between server and desktop chips, but since the chips are similar silicon and have the exact same instruction capabilities, it doesn't need to.
Q. My PC is unbranded and it gets restart all the time depite adequate ventilation. Can any one let me know the reason of restart
There could be many:
1. Undersized or failing power supply
2. Dust buildup in the CPU heatsinks or power supply causing a thermal shutdown
3. Memory errors
4. An intermittent short in the power switch or other electrical part (shorts will usually cause the PSU to shut off)
5. OS/driver/software errors, if you have the computer set to reboot immediately after a BSOD
6. Improperly-installed CPU heatsinks
7. Degradation of the thermal grease on the CPU heatsinks
8. Undersized CPU heatsinks or a CPU heatsink fan that spins at too low of an RPM
9. Excessively high case or intake air temperature