XMP drastically increases the temperature

Once in the BIOS incorporate XMP prifil 1 speed memory is increased to 1600mgz and the voltage 1.65v. Otherwise, no XMP memory option "Kingston HyperX 4GB 1600MHz DDR3 T1 Series Non-ECC CL8 XMP" works perfectly on 1333mgz. However, with increasing frequency with the XMP 1600mgz drastically increases the temperature and the CPU. Intel i7 860 at full load is not exceeded 50c and now at idle (only built in OS) reaches 46-48C. No XMP temperature return to 28-30C. At full load the XMP temperature is reached almost 80C. Currently I have all returned to normal. I installed the new BIOS F6A.
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  1. Set your voltages manually. Or, easier still, change your memory multiplier. With the i7 860 you can set your memory multiplier to 12, or whatever is appropriate for your board, and run at 1600. Still a good idea to set your DRAM V to the factory spec.
  2. OK, but why increase CPU Temperature? Embedded Memory with XMP 1600mgz the factory is working on 1.65v.
  3. What V does the RAM run at when XMP is disabled? It doesn't make sense that your temps would raise almost 20C just by turning XMP on. Sounds like too much V is being sent through when you enable XMP. That's why I suggested manually setting the BIOS values.
  4. V 1.5, 1333mgz. When is XMP turn on V 1.65, 1600th CPU temperature in idle is 35-40C with full load goes up to 78-79C.
  5. And at idle with XMP disabled, RAM at 1333, your CPU idles at 28-30?

    It looks like this is your RAM: http://www.newegg.com/Product/Product.aspx?Item=N82E16820104142

    Try taking the side of your case off and measure idle and full load with XMP enabled and XMP disabled. Also, what is the ambient temperature?
  6. Room temperature is between 18-20C. I'm not taking the side of case but it'll do. I do not understand why CPU raises the temperature when the frequency remained at 2.80.
  7. I don't have a good answer for you. If the only thing that changes is that the RAM multiplier is increased and the V goes up, you shouldn't see that much change in temp.

    Next time you test idle & full load - with XMP on and XMP off - see what CPU says your Core Voltage is. Be interesting to see if for some reason when under load the Core Voltage with XMP on is different than with XMP off.
  8. Thank you. Serbia still has not lived new hardware and do not have anyone to ask and to know the answer, with security. Once again, thank you.
  9. Hey... Is it possible that the motherboard does not measure well the temperature? When the finger touch CPU does not feel the heat even though motherboard says that the processor is 70C.
  10. What motherboard do you have?
    What are you using to measure the temps?
  11. My motherboard is a Gigabyte P55-UD3. To measure temperature, I used RealTemp, Speccy and readings from the BIOS.
    The Prime95 showed temperature 80-83C. When you touch on the CPU only warm. CPU cooler spinning like a really temperature 80C.
  12. The temperatures reported by RealTemp should be accurate. Do you have the latest BIOS?
  13. Yes, I installed the F6A and all the same.
  14. Hi all, sorry to dredge up a 2 month old thread, but I just wanted to report that I observed the exact same issue with the same motherboard.

    Gigabyte P55A-UD3 and an i5 750. If i load the default bios settings my memory runs at 1333mhz and under prime95 stress I get up to 64C cpu temperature.

    If i go into the Bios and enable XMP: Profile 1 and then rerun prime95 I observe temperatures of 80C+ .

    I didn't check the cpu voltage on either of these trials, but I haven't changed it from the default setting.

    Anyhow, just wanted to let ctxorka know that he's not crazy and check to see if anyone has any new advice.


  15. I stopped to bother about it. I wrote to Gigabyte but nothing. They have no answer.Check this out, it can be useful:

  16. Hey everyone, I have the same motherboard and am experiencing the same thing with Corsair vengeance RAM I just installed. Thread here:http://www.tomshardware.com/forum/316136-30-corsair-increasing-temps

    Per previous suggestions, I checked the CPU core voltages with and without XMP active. without: RAM 1333mhz and CPU V: .896 WITH: RAM 1600mhz and CPU V 1.136.


    "In summary: So after my detective work, I figured out that the heat difference while idling was caused by differences in CPU core voltages while idling. The differences in idling voltages are related to the CPU idling clock speed. For whatever reason, with the Gigabyte P55-UD3 board, when the RAM is clocked from 1333mhz (auto) to 1600 mhz, either by XMP or manual RAM clock increase, the CPU does not downstep while idling. It stays at 2.8Ghz, or a 21 multiplier. Conversely, when the RAM is at 1333Mhz, the CPU generally downsteps to x9 multiplier (1.2GHz) while idle. Thus, in turn, lowering the Core voltage and with it, the CPU temperatures. A solution? If you need to run your RAM at 1600mhz, I'd suggest getting a program to manually control CPU clock speed and downclock when you're idling."
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