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Bad i7 CPU?

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August 4, 2009 9:35:50 AM

Hi,

I just tried about everything:

Asus P6T + i7 920 + Arctic Cooling Freezer Xtreme = 50°C idle and 80°C under load

Gigabyte UD3R + i7 920 (the same one) + Stock cooler = 55°C idle and 85°C under load

Gigabyte UD3R + i7 920 (the same one) + Arctic Cooling Freezer Xtreme = 47°C idle and 80°C under load



Used HWmonitor, Speedfan, Realtemp and CoreTemp for temps.

Realtemp's stress test give me a temp at around 85°C a few seconds after starting (I stop it directly afterwards) (my mobo beeps to warn me that temp is too high)

Sensor movement test gives me something like 22 22 22 24


The paste was well placed, did it about 20 times and in all the possible ways.

Is my CPU broken?

More about : bad cpu

August 4, 2009 9:38:38 AM

Crasa said:
Hi,

I just tried about everything:

Asus P6T + i7 920 + Arctic Cooling Freezer Xtreme = 50°C idle and 80°C under load

Gigabyte UD3R + i7 920 (the same one) + Stock cooler = 55°C idle and 85°C under load

Gigabyte UD3R + i7 920 (the same one) + Arctic Cooling Freezer Xtreme = 47°C idle and 80°C under load



Used HWmonitor, Speedfan, Realtemp and CoreTemp for temps.

Realtemp's stress test give me a temp at around 85°C a few seconds after starting (I stop it directly afterwards) (my mobo beeps to warn me that temp is too high)

Sensor movement test gives me something like 22 22 22 24


The paste was well placed, did it about 20 times and in all the possible ways.

Is my CPU broken?


that happened to me. heres your answer, did a video on it.
http://www.youtube.com/watch?v=Mvw91B9iWcU
August 4, 2009 9:40:49 AM

Also the voltages in the bios are all fine but once in windows HWmonitor and SpeedFan tells me:

+12V at 0.98V
-12V at -12.03V
VBAT at 3.06V
+5V VCCH at 3.58V

CPU Vcore min 1.04 & max at 1.25

Dunno if that means anything.
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a b à CPUs
August 4, 2009 9:49:28 AM

what does the bios temperature read out give you?
August 4, 2009 9:51:14 AM

Around 43 to 46 °C when the pc is just started
August 4, 2009 10:25:20 AM

Crasa said:
Hi,

I just tried about everything:

Asus P6T + i7 920 + Arctic Cooling Freezer Xtreme = 50°C idle and 80°C under load

Gigabyte UD3R + i7 920 (the same one) + Stock cooler = 55°C idle and 85°C under load

Gigabyte UD3R + i7 920 (the same one) + Arctic Cooling Freezer Xtreme = 47°C idle and 80°C under load



Used HWmonitor, Speedfan, Realtemp and CoreTemp for temps.

Realtemp's stress test give me a temp at around 85°C a few seconds after starting (I stop it directly afterwards) (my mobo beeps to warn me that temp is too high)

Sensor movement test gives me something like 22 22 22 24


The paste was well placed, did it about 20 times and in all the possible ways.

Is my CPU broken?

Hi. I had the same issue with mine. It's because the IHS on the cpu is concave and very uneven. Lapping it will solve the issue though it will void your warranty :whistle: 
(Lowered my idle cpu temp with 15c and my load with 15-20 C)
August 4, 2009 10:37:18 AM

you sure you read your +12V correctly? should be 12V +-0.5V but then again if the +12V is 0.98V your system woudn't come on.
August 4, 2009 11:21:46 AM

That's true it wouldn't start,

the voltage readings in bios are all fine (the 12v has 11.88V)

but once I'm in windows every program tells me 12v is at ~0.98v



Lapping huh...I might try that out as I don't have a boxed version, and it seems there is no intel warranty for those versions.
Plus intel doesn't reply to my mails.
a b à CPUs
August 4, 2009 11:27:04 AM

Software voltage readings are notoriously unreliable. Use a digital multimeter if you want the actual numbers.
a b à CPUs
August 4, 2009 2:07:24 PM

Get a razor blade and hold it on the IHS with a light source behind it. If light bleeds through, it's not flat enough. Rotate the blade to cover all directions.
August 4, 2009 6:50:35 PM

Ill try the razorblade thingy tonight.

But does anyone know what the results of the sensor test mean?

It should be lower than 22 right? But what does it mean if it is too high?
August 8, 2009 12:28:42 PM

*UPDATE*

I just did it. To be sure...I bought a new i7 920 (265 euro auwch), now I have the D0 revision instead of C0.

Installed it together with the AC Freezer Xtreme cooler. (On the Asus P6T mobo, voltages are all fine)

At startup cpu temp in bios: 38°C

Once in windows: cores: 46°C idle(RealTemp) CPU: 39°C idle (HWmonitor & Speedfan)

Strangely Speedfan says the cores are at 30°C idle...How come????


Under load: 71°C cores (Realtemp) 55°C with speedfan and CPU is at 60°C (Speedfan & HWmonitor)


WTF is happening?

August 8, 2009 3:19:28 PM




which one should I believe for core temps?
August 8, 2009 5:15:35 PM

I'd trust hwmonitor, in my experience speedfan can get some weird readings :??: 
August 9, 2009 1:59:02 PM

Thought so too but how come there is a difference of at least 15°C between the CPU and the cores? Is that even possible?
a b à CPUs
August 10, 2009 4:31:17 AM

Speedfan has not been updated to read Tjunction Target from the CPU as you can with i7. Real Temp and Core Temp both will, and I'm not sure about HW Monitor. You can use an offset in Speedfan to correct it once you use another program to align it with.
August 10, 2009 10:15:26 AM

ok thx coretemp & realtemp are giving me the same temps as HWmonitor.

But isn't 45°C idle a bit hot for such a cooler?
August 13, 2009 9:16:57 PM

So it's not my motherboard, nor my cpu so how come my pc is so hot?

Did you ever try to open Realtemp & HWmonitor? Look what realtemp tells me when I do that...Realtemp gives me frequences like these:

a b à CPUs
August 14, 2009 12:56:08 AM

I vaguely remember the Real Temp developer saying that you can't run the two together without some little mess-up. I think they use the same way of calculating or reading clock speed and they interfere.

What is your air flow like? What, most importantly, is your ambient air temperature? Everything depends else on that.
August 15, 2009 10:12:49 AM

héhé that's funny, but I still have a sh*tty pc right now.

Air flow is fine, I have a Thermaltake Soprano DX with a front and rear fan, ambient temp is around 25°C but even when I use the airconditioning(room temp is 20°C then) the cores temps don't get better.

Could it be my ram memory? Because it gets really hot after a few minutes (I have 3x2GB Corsair 1333Mhz CL9)
a b à CPUs
August 15, 2009 12:55:46 PM

I doubt it would be producing enough heat to affect the CPU. The video card might pump out a good deal of heat though.
August 15, 2009 1:27:34 PM

But could defect memory be causing overheating?

I have GTX285 but it has 4 copper pipes and 2 fans.
I still have a 8800GT that I could try to put in instead.
August 21, 2009 2:28:35 PM

I just changed the graphics card to a 8800GT Leadtek Zalmann but no change in temps.

Tried putting only one ram memory no change.

I really don't know why my cpu is so hot...
August 22, 2009 8:24:24 AM

Adjust your Vcore from AUTO to 1.10~1.15V. ASUS BIOS is notoriously known for automatically overvolting the CPU.
August 25, 2009 4:25:30 PM

Done but idle temp still at 51°C...
August 25, 2009 5:20:58 PM

I have also a core i7 920 - Asus P6T build and I have similar temp readings, about 47°C at iddle and +80°C under prime 95 load test, I even post a thread here and it seems is a common temperature for a core i7, a friend of mine with the same build has temps of 45°C or so at iddle, but we live in a very very hot enviroment (30°C room temp aprox) and we're using stock fan (altough that is going to change soon). So either we all have a deffective core i7 or just is "normal" for a core i7 to work at that temp. I'll let you know if the new heatsink make any real difference.
August 25, 2009 8:19:55 PM

Yes please tell me if it helps because it didn't for me...between stock cooler and AC Freezer Xtreme I got a difference of about 5°C.

Other difference is my ambient temp at only 22°C...

And I don't think it is defective because I bought 2 i7's processor and it is the same
!