Where's the thermal diode?

[Wetling]

http://discussions.hardwarecentral.c...&postid=777779

It's been said that the temp reported in the BIOS come from an in-socket diode, but I don't see one.

[deathstar13]

lol you dont see it becouse its not in the picture.
the thermal diode is inside of the cpu core.the mobo has built in ability to read that and its much more accurate.

[zorbo]

not true, although it uses the thermal diode to control the Overheating shutdown feature. The bios and windows reads a thermal diode that touches the pins of the cpu (it's in the plastic part of the socket)

[Pacman]

not true, although it uses the thermal diode to control the Overheating shutdown feature. The bios and windows reads a thermal diode that touches the pins of the cpu (it's in the plastic part of the socket)

...and nobody from EPoX will tell us overclockers what the difference in temperatures is , ie, if the max die temp of an XP is 85C - what would that show up as in the BIOS/MBM5/etc?

[Holst]

Originally posted by Pacman


...and nobody from EPoX will tell us overclockers what the difference in temperatures is , ie, if the max die temp of an XP is 85C - what would that show up as in the BIOS/MBM5/etc?

because doing so it absolutely impossible.

I cant take a guess if you like.... or I can roll 3 six sided dice and add up the result.

[Pacman]

I accept that but it would be nice if there was some kind of correlation - ie, an approximation - rather than waiting for the thermal cuttoff to come into play . I guess we would know then but I'm not willing to try it

[MiGGinZ]

Just to give you an idea of the difference, Me and my friends, all 8RDA+ owners took a probe to our CPU's and here is what we came up with.

Mine USDM:42c PROBE:54.2c
My mate Dave USDM:38c PROBE:48.5c
My other mate Paul USDM:45c PROBE:54.1c

so about an average of 10c off USDM measurements which was also quoted elsewhere, cant remember which site though.

[Wetling]

Why would they put it in the plastic part of the socket and not in the middle?

[MiGGinZ]

maybe the PINS on the CPU heat up more than the bottom of the CPU so they can get better readings

[Wetling]

I don't think that makes much sense. The hottest part of the CPU has to be the core.

[mookydooky]

Originally posted by Wetling
I don't think that makes much sense. The hottest part of the CPU has to be the core.

Since P3, all we've been seeing are flip chips which basically means the core is on top, where the heatsink sits. You probably wouldn't want a thermistor between your heatsink and your core. And as Aedan pointed out before, different parts of the core run at significantly different temps so you can't really get a "perfect" reading.

[Wetling]

Of course you can't get a perfect reading, but as I've said, I don't understand how putting the diode further away from the chip could be considered a good solution. I mean, if you're going to read the temp from the pins, why not from the MB traces?

[Random Nonsense]

Simple, air conducts heat less effectively than any metal. the pins are metal and will therefore be closer to the actual CPU temp, most in socket thermisters read teh AIR temp in the socket. you have to bend it upwards to contact the CPU back. Which is in turn useless on a palomino. As then it just reads the temp of the little components on the back. Hence when i ran an 8kha+ and XP1800+ reported CPU temp was always 32-35 c, whether i was running chilled water, or a heatsink that wasnt contacting half of the core.

[sepal]

ok ok ok goodgod

plastic diode reader is not always present in newer boards , period. Newer/better ways of reading core temp is in fact inside the cpu as stated before. Older Cpu's dont have that feature built in like current ones do. Hence Boards wont have them as time goes by...

*waits for flame*