voltage changes under load? how are these temps?

[thomsbrain]

i've got a P4 2.53GHz on my Abit IT7. It's running at 2917 MHz right now, I've been creeping up the limit. As some of you know Abit boards run a lower voltage to the CPU than you set in the BIOS, usually from .03 to .05 volts less, so I've been watching it as I change it. One thing I noticed while doing this is my voltage drops when I put the CPU under load. The drop is from .02 to .04 or so. I'm using a Antec True Power 550, so I'm guessing this is another Abit voltage weirdness. Anyone else seen this happen?

And how are these temps? the motheboard reports 39C (which I assume is the chipset), but my CPU is way the hell up around 62C. I'm using an Alpha with one of those super quiet Panaflos... the temps are only 2C cooler than the retail H/S. Is the panaflo just not powerful enough to get my temps down? IS 62C too hot to run for the long term?

 

[CrazySaint]

Its not uncommon for the voltage to dip a bit under full load. My Asus P4B533-V drops from around 1.55v to about 1.5v under full load.

Those temps are definitely high. What voltage are you running at? At 1.55v and 2.61GHz, my 1.8A runs around 51/52C with the Intel stock fan. Are you using a thermal pad or AS3?

 

[thomsbrain]

It's at 1.52 volts. I'm using ASII. If I put it on too thick, could it be making that much of a difference? I put on a fairly thin layer, but it might have been thicker than I usually do

 

[Painman]

What kind of case cooling do you have? The mainboard temp comes from the hardware monitor chip IIRC, so it sounds like it's pretty hot in there...

 

[thomsbrain]

there are two Vantec Stealth 80mm inputs, one in front and one on the side, one Stealth on output, and the PSU has it's 92mm and 80mm fans outputting. However, the Stealth's are plugged into the PSU's temperature controlled fan power chain, so they don't spin as fast as usual.

other heat producing things in the case are a couple of optical drives, a couple 7200 RPM hard disks, a GeForce 4, and a high end audio card.

 

[CrazySaint]

Originally posted by: thomsbrain
there are two Vantec Stealth 90mm inputs, one in front and one on the side, one Stealth on output, and the PSU has it's 92mm and 80mm fans outputting. However, the Stealth's are plugged into the PSU's temperature controlled fan power chain, so they don't spin as fast as usual.

other heat producing things in the case are a couple of optical drives, a couple 7200 RPM hard disks, a GeForce 4, and a high end audio card.

I've only got two case fans (one intake in the HDD cage and one exhaust) both attached to the PSU's temperature control and I'm using the stock HSF and my temps are still about 10C lower than yours (granted my CPU is running a bit slower than yours, but my voltage is also higher (1.6v now)).

 

[thomsbrain]

Originally posted by: CrazySaint

Originally posted by: thomsbrain
there are two Vantec Stealth 90mm inputs, one in front and one on the side, one Stealth on output, and the PSU has it's 92mm and 80mm fans outputting. However, the Stealth's are plugged into the PSU's temperature controlled fan power chain, so they don't spin as fast as usual.

other heat producing things in the case are a couple of optical drives, a couple 7200 RPM hard disks, a GeForce 4, and a high end audio card.

I've only got two case fans (one intake in the HDD cage and one exhaust) both attached to the PSU's temperature control and I'm using the stock HSF and my temps are still about 10C lower than yours (granted my CPU is running a bit slower than yours, but my voltage is also higher (1.6v now)).

yeah, see that's why i was asking. my temps are ridiculous. i mean crap, the alpha on this thing weighes like two pounds and has a copper core. you'd think it would at least be better than stock, but it's no better than your rig. maybe i'll try re-applying the ASII. My tube of ASII is pretty old, can this stuff go bad somehow?

 

[thomsbrain]

i tried running it for a while with the case open, and temps dropped to 36 system/59 CPU. It's not hot in this room, in fact the window is open and the night air is coming down over the system. Maybe my temp readings are just wrong? The heatsink is fairly warm to the touch, and the fan is blowing hot air out of it, so it seems like it's doing it's job...

 

[spacelord]

what program are you using to monitor these temps? Does the BIOS report these same temp ranges?

Your temps seem very high. Without overclocking on my P4 2.53 I rarely reach 44 deg C under stressed loads. I only have 2 exhaust fans on my Antec Aluminum case.

 

[thomsbrain]

I'm using the Winbond Hardware Doctor that came with the motherboard. BIOS seems to report similar temps.

 

[Duvie]

39c for a chipset temp is absoulutely insane...I don't trust it and it is widly known that the abit mobos report some of the highest temps out of all the p4 mobos.....I think the chipset temp says it all unless you have it like 100 degrees in side your case!!! Sounds like BS to me....My system or mobo temps usually tend to run 3-4c higher then room temperature andat idle and climb like 3c more under load....

May want to take a look at some more case cooling....If temp in room is around 75f and you take side off of case and place a large fan blowing into case onto chipset and the temps don't get down to around30c or less I think it is definitely a temp reporting issue...

Some guys out there have a way to calibrate the true temp to see how far it is off...


May look at getting a ystech fan or some other 80mm that can push near 50cfm....

 

[thomsbrain]

i've done the case off, cold breeze directly on the open computer thing, temps dropped only 3 degrees celcius to about 36. The breeze from outside was probably around 10 degrees celcius. so it seems like the case is getting cooled ok.

It's 22 celcius in my room right now, and the idle chipset reports 33 degrees. figure about 3 degrees like you said, and the mobo is still reporting about 8 degrees high at this temp. that would bring my full load CPU temps down to more like 54 or 55 celcius. the difference could be higher for CPU, or higher as the temps climb, so maybe my temps aren't so bad after all.

 

[Duvie]

Check it out in more abit dominated discussion groups if you can find them...However this is no secret and I have know about the higher reported temps with abits for several months.....

Stability is the ultimate decideing factor...Runing sandra benches or something while prime is running full load and see if the scores look really low like chip is throttling...My guess is you are fine and the temps are to be taken with a grain of salt...


What is the chip at default vcore and defualt speed at???

 

[thomsbrain]

temps are around "60 celcius" at default speed of 2533, and a voltage of 1.38 volts (way low, but runs nice and stable).

 

[TumBO]

Originally posted by: thomsbrain.... the fan is blowing hot air out of it, so it seems like it's doing it's job...

Why not try turning the fan around so it blows ON the HS. And a faster fan will definitely help out. Maybe something adjustable so you can set it at a volume that you can live with.

 

[Technonut]

I am running the IT7. From what I gather reading posts at other forums, the temps could be showing 5-10 C higher than actual.

The current temp with my 1.8A (watercooled) @ 2950 / 1.74V is showing as 46.5 C. The board temp @ 31 C. When I touch my waterblock, it barely feels warm.

I am also running the Antec True Power 550. My CPU voltage is always lower than set in the BIOS. I have it set @ 1.80V now to get 1.74V.

 

[thomsbrain]

Originally posted by: Technonut
I am running the IT7. From what I gather reading posts at other forums, the temps could be showing 5-10 C higher than actual.

The current temp with my 1.8A (watercooled) @ 2950 / 1.74V is showing as 46.5 C. The board temp @ 31 C. When I touch my waterblock, it barely feels warm.

I am also running the Antec True Power 550. My CPU voltage is always lower than set in the BIOS. I have it set @ 1.80V now to get 1.74V.

yay! i'm not crazy! and my CPU isn't frying!

as for the CPU fan, it's supposed to blow out, it's an Alpha with one of those fan shrouds. But yeah, a faster fan would cool better. I just like it quiet. Sounds like with the mobo not reporting accurately, it's actually doing it's job.