CPU Temps higher after trying higher vcore... ???

[travsav]

Was trying to get 2400-2500mhz on this system:

AMD AthlonXP 2500+ (AQXEA)
Thermalright SLK-947U w/TT Smartfan 2
1x512mb Mushkin PC3500 Level 2

Took the voltage clear up to 2v... my temps stayed below 58 degrees at load... @ 1.85vcore my temps stayed below 50... after switching back to 1.85 from 2.0, my temps get into the low 50s now...

What's up with this? Also, I think my temps are awful high for my HSF, and I have a decent case (I think)...

 

[Flyermax2k3]

What are you complaining about? I see about 55C under load on my AXP 2800+ Barton with a mild o/c (172MHz FSB up from 166MHz) on 1.675V. And that's with 4 case fans and a TT Volcano 7+ w/Delta fan on maximum! I know there's better cooling solutions out there but it's not like I'm using some POS $5 HSF...

 

[dmcowen674]

Originally posted by: Flyermax2k3
What are you complaining about? I see about 55C under load on my AXP 2800+ Barton with a mild o/c (172MHz FSB up from 166MHz) on 1.675V. And that's with 4 case fans and a TT Volcano 7+ w/Delta fan on maximum! I know there's better cooling solutions out there but it's not like I'm using some POS $5 HSF...

57 C 3200 XP 400 FSB OC to 420

No extra fans, only stock AMD CPU HS/FAN and PS.

 

[Sid59]

more juice = more heat

 

[Fern]

What are you monitoring temps with ?

What are u using to report vcore?

Has ambient room temp changed?

Is pc near a heating vent?

Are both reports under load or idle? Temps will change

What are fan rpm's during temp reading, if diff, temps will be diff

Soo many variables!

 

[petery83]

isn't 2 volts a bit on the high side?

 

[Navi]

Simple Ohms Law

Power = Voltage * Current. Since the system is digital, the currents will be approximately the same (assuming frequency is the same). Therefore by increasing the voltage you just increased the power dissipation. End of story...

 

[mamisano]

I think you guys are confusing what his question is....

BEFORE he raised the VCore from 1.85 to 2.0, his temps were BELOW 50c.

After Raising the VCore to 2.0 for overclocking, and then RETURNING to the original VCore of 1.85 his temps are now ABOVE 50c.

 

[Navi]

Ahh...finally got it. Also, explainable then. The smaller part geometries (130 nm, 90 nm) etc mean smaller barriers to stop electron leakage (also known as leakage currents). The smaller the geometry, the less tolerant the parts are to overvoltages. If he cranked is Vcore up too "high" he may have damaged several of these walls (applied to much stress) and broken them down slightly therefore allowing more electrons to leak through the barriers and thus causing more losses. Leakage currents are becoming a major concerns in CPU design, and people overclocking only makes it worse. If you violate a CPU's VCORE specs...you are taking a risk the CPU house wasn't planning on.

 

[Fern]

Yeah Mamisano I got it, but he doesn't say how many degrees diff. What I was getting at above is stuff like change in ambient temps etc, will make a few degrees, at least it does in my case. Gee in my case, when the sunlight hits the room my pc is in, up goes the temp. Especially if the sunlight hits my case window and shines on my mobo.

If his pc is in room where the ambient temps are steady, and no sunlight, no floor heating vents etc., well then maybe the above leakage thingy is it.

Cheers