Lm_sensors accuracy and getting Vcore

I don't know what better place to put this, so I will put it here i guess.
I used to overclock computers in windows all the time, but now as a pure linux user for a few years, I want to play with this PC here and get back into it a little. I am using lm_sensors to get my temps and mprime to do full load and stability testing, everything is going good so far. Some questions I have, first, how accurate is lm_sensors? I remember back in windows there were two programs, one was called coretemp and the other realtemp, and they gave values that differed by 10c on my chip (Intel Xeon x3350 quad core penryn)...through research i found this was due to how the temperature is measuring using TjMax, and how the different programs had different TjMax set...so I am wondering what is the situation like with lm_sensors?
Also, how would i view my Vcore of my processor through applications/tools in linux and not just the bios? I have not figured that out yet.
Anyways, here is my output from the sensors command on my chip, this is during the running of mprime small FFT for full processor utilization for over 3 hours now...
acpitz-virtual-0
Adapter: Virtual device
temp1: +52.0°C (crit = +84.0°C)
coretemp-isa-0000
Adapter: ISA adapter
Core 0: +56.0°C (high = +76.0°C, crit = +100.0°C)
coretemp-isa-0001
Adapter: ISA adapter
Core 1: +57.0°C (high = +76.0°C, crit = +100.0°C)
coretemp-isa-0002
Adapter: ISA adapter
Core 2: +51.0°C (high = +76.0°C, crit = +100.0°C)
coretemp-isa-0003
Adapter: ISA adapter
Core 3: +57.0°C (high = +76.0°C, crit = +100.0°C)
My Core2 has a messed up sensor on it, thats why its so far off from teh others, but no bid deal there, im just wondering if these need to be normalized or if they are the actual correct temperatures? Oh, and this is overclocked from the 2.66Ghz stock up to 3.2Ghz, simply by bumping up the FSB to 400mhz, and putting the ram in 1 : 1 ratio keeping it at 800mhz...
So, if anyone knows the true accuracy of these numbers and whether or not there is a way for me to get Vcore, that would be great....
Thanks all

BTW at least for me, lm_sensors provides Vcore too:
atk0110-acpi-0
Adapter: ACPI interface
Vcore Voltage: +1.46 V (min = +1.45 V, max = +1.75 V)
+3.3 Voltage: +3.17 V (min = +3.00 V, max = +3.60 V)
+5.0 Voltage: +4.87 V (min = +4.50 V, max = +5.50 V)
+12.0 Voltage: +11.39 V (min = +11.20 V, max = +13.20 V)
CPU FAN Speed: 1834 RPM (min = 0 RPM)
CHASSIS FAN Speed:1985 RPM (min = 0 RPM)
CHIPSET FAN Speed: 0 RPM (min = 0 RPM)
CPU Temperature: +64.0°C (high = +90.0°C, crit = +125.0°C)
MB Temperature: +34.0°C (high = +70.0°C, crit = +125.0°C)

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