Voltage, temp, MBM5/CPU-Z accuracy questions

[SithSolo1]

System:
2500+ Barton 0343 locked 2.31ghz @ 1.75v according to the BIOS
Abit NF7-S v2.0
512MB (2x256) Dual-Channel LvL 2 PC3500 210mhz @ 2-3-3-11 2.8v
Thermalright SLK-900a w/ 64CFM 92mm fan and Arctic Silver Ceramique
Antec True380 PSU
2x7200rpm HDDs
floppy
DVD-Rom
CD-RW
2x120mm case fans
Radeon 8500
Wireless nic
Sound Storm
WinXP Pro w/ SP1


Voltage first:

Are these ok: Voltage
I've got the voltage set to 1.75 in the BIOS but both MBM5 and CPU-Z are fluxing between 1.71-1.74 during idle and dropping to about 1.70 under Prime. Should I be worried?

Temperature:

MBM5 is reporting 46C under full load, the thermal probe in my case is reporting 51C at the same time. Which do I believe?

MBM5/CPU-Z Accuracy question:

How accurate are they with both temp and voltages?

Thanks,
J.

 

[SithSolo1]

Well I got it Prime95 stable 2.4ghz @ 1.85v in the BIOS(MBM5/CUPZ both read ~1.83). This is on air cooling: idle is around 38C, general usage around 44C, and full load is 55C. This is also on a fresh apply of the thermal paste so it's not broken in yet. Anyway, is this too high of a vcore, should I back it down?

 

[SithSolo1]

Some people say 1.85v is too high, then I see others running 1.9, 2.0, and even 2.1 Who should I believe?