Strange temp readout on Q6600 @ 3.4 GHz

I overclocked my Q6600 to 3.4 GHz (426x8) and run stable 24+ hours under prime95...
But the temperatures on the 4 cores are different in 2x2 fashion... Namely first 2 cores (0 & 1) are running @ 66 deg at most while at the same time other 2 cores (2 & 3) are running @ 61 deg...
This difference is constant always - during stress-test or gaming... when idle the difference is bit less (2-3 deg)
Is this normal?

Ah, yes, the heat sink is Thermalright IFH-14...

Initially I thought that I have applied the thermal paste (the one which comes with zalman cooler) wrongly because I have this "big" difference... I reinstalled the heat sink again and also used another thermal paste (Innovation Cooling Diamond 7 Carat - very good paste - temp. drops from 72+ to ~66 deg), but I still have this difference in temperature.

any idea why? is the contact surface of the heat sink I need to check (maybe lapping the heat sink)?

6 answers Last reply
More about strange temp readout q6600
  1. It is perfectly normal, but I don't remember why it happens.
  2. My Q6600 does the same thing. I get 61/65C at 3.6 GHz at 1.42 volts with a handlapped TRUE in an Antec 900 case. Remember, a Q6600 is two E6600 cores "glued" together and I doubt if Intel took the time and trouble to thermally match both cores.

    Don't worry about it.
  3. Yup, Ditto above. Completely normal. The cores are maufactured to a certain tolerance so your not going to get 2 identical cores so the power usage and temp output on each core will be slightly different.
  4. Thanks folks... :)
    I know that Q6600 is 2xE6600 under the hood, so indeed it is not big surprise to have some difference, but I didn't expect such big difference. That is why I asked...

    guess what - my nick name is "stupido" thus I'm no brainer... :pt1cable: and I know that not all programs use all 4 cores and that is why I use prime95 to test my overclock... on all 4 cores... :bounce:
    and still I find it strange to have such a big difference. But thanks to the jsc & m_silkstone I have better understanding... so thanks for nothing to you... :hello:
  5. There could also be a difference in the calibration of the thermal sensors for each pair of cores. The bottom line is that your temps are good for a Q6600 @ 3.4 GHz.
  6. Stupido,

    Your Q6600 is not properly calibrated.

    Q6600 B3 = 2 x E6600 B2
    Q6600 G0 = 2 x E6850 G0

    Q6600 G0 Thermal Specification is 71c, which is CPU temperature, not Core temperature. This is a very common misconception.

    Q6600 G0 from Intel's Processor Spec Finder -

    Core temperature is 5c higher than CPU temperature at full load. See Page 4, Figure 5 in the following Intel document -

    From the Core 2 Quad and Duo Temperature Guide -

    Section 6: Scale

    Scale 2: Quad
    Q9x50: Tcase Max 71c, Stepping E0, TDP 95W, Idle 16W
    Q9x50: Tcase Max 71c, Stepping C1, TDP 95W, Idle 16W
    Q9400: Tcase Max 71c, Stepping R0, TDP 95W, Idle 16W
    Q9300: Tcase Max 71c, Stepping M1, TDP 95W, Idle 16W
    Q8200: Tcase Max 71c, Stepping M1, TDP 95W, Idle 16W
    Q8200: Tcase Max 71c, Stepping R0, TDP 95W, Idle 16W
    Q6x00: Tcase Max 71c, Stepping G0, TDP 95W, Idle 16W<--Q6600 G0

    --70--/--75--75--75--75-- Hot
    --65--/--70--70--70--70-- Warm
    --60--/--65--65--65--65-- Safe
    --25--/--30--30--30--30-- Cool

    Tcase = CPU temperature
    Tjunction = Core temperature

    You can calibrate your CPU temperature and individual Core temperatures by using Section 9 in the Guide.

    Comp :sol:
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