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Intel i5-750 w/ Gigabyte P55A-UD4P **temp danger?**

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December 5, 2009 7:41:32 AM

Thermaltake Element G
Gigabyte P55A-UD4P
Intel i5 750
Win7 Ultimate 64x
Corsair H50 cpu cooler
Corsair ddr3 4x2gb 1600
Sapphire HD5770 gpu
Seagate 500gb HDD
Corsair 650w psu

Does anyone know what's the danger temp zone for the i5-750? I'm trying to oc my i5 to 3.8 and is testing it with prime95, temp are reaching into the 80's c. I only have it at 1.2v for core. Need some help please...
a b à CPUs
December 5, 2009 3:31:21 PM

Pretty sure the i5 temp limit is like 70/72C.

I'm surprised your Corsair H50 is letting you hit 80C. I'm pushing 4Ghz @ 1.32V on my setup and highest I hit with Prime 95 is 71/72C with all 4 cores at 100%.

And frankly I need to reapply my AS5, because two cores are about 5C less than my hottest.

You and I basically have the same motherboard, yours just has USB 3.0 on it, and mine is USB 2.0
December 6, 2009 9:05:56 AM

jerreece said:
Pretty sure the i5 temp limit is like 70/72C.

I'm surprised your Corsair H50 is letting you hit 80C. I'm pushing 4Ghz @ 1.32V on my setup and highest I hit with Prime 95 is 71/72C with all 4 cores at 100%.

And frankly I need to reapply my AS5, because two cores are about 5C less than my hottest.

You and I basically have the same motherboard, yours just has USB 3.0 on it, and mine is USB 2.0



wow.. Maybe I need to reapply the artic silver 5 too... Mine is about 5c off also. Can you help me with the numbers in bios. I tried working on it for days now and I can't get the correct specs so my temp just keeps rising. I'm new to the quad core, I used to have duo core and this quad core has a lot of stuff to configure so I don't know if I'm doing it correctly or not. Please help. Would love to get all the things you changed in bios.
Related resources
December 6, 2009 7:00:43 PM

I agree the OP has issues with heat, and may need to re-seat his heatsink in this case. However don't let yourself think all cores should read equal. I own 5 intel quads all from Q6600 to I-7 920. They all vary from 2c to 8c from core 0 to 4 at full load prime 95 some more than others. I have a 9450 that seems to go no lower at idle than 48c no matter the heatsink used. Even with a thermalright IFX-14 Fire extinguisher I tend worry mainly that non exceed 70c under prime 95 full load.
December 7, 2009 12:17:21 AM

I just reapplied some Antec silver 5 the proper way and my quad core are all idle'n at 18c. They're all exactly the same too. It will jump here and there but most of the time, all four numbers are the same.. This is pretty awesome. The bad news is that I have to pull it apart and return my mobo because I have two defective dimm slots. Sux ass but I have to cuz I want to add another 4ghz to my system.
a b à CPUs
a b K Overclocking
December 7, 2009 3:39:44 AM

what are you using over 4 ghz of ram for? 8 ghz of ram is overrated for most applications~
December 7, 2009 5:18:02 AM

I do a lot of downloading and gaming and movies. I normally have a lot of windows open and downloading at the same time. Even with 4ghz, it sometimes uses up to 65 or even 85% of the mem until I'm done. :D 
a b à CPUs
a b K Overclocking
December 7, 2009 8:17:30 PM

The next question is, once you add the ram, did you a notice a difference in speed? I am guessing not, but only one way to find out =)
December 8, 2009 1:26:59 AM

Adroid said:
The next question is, once you add the ram, did you a notice a difference in speed? I am guessing not, but only one way to find out =)


I dunno. I don't have the mobo. I just shipped it back for a new one. I needed to do that before my 30 days expired. So that'll take like two weeks before I get a new one.
a b à CPUs
a b K Overclocking
December 8, 2009 12:43:53 PM

The hottest core on my i5 is the 1st core and its maximum temperature is 59-60C at 3.8GHz with Prolimatech MegaShadow + 2x 1800rpm 90CFM coolermaster fan.

The Corsair H50 is on par with the prolimatech+one fan, so your temperature is absolutely abnormal. Try to reset the water block.

BTW, a merely 1.2V at 3.8GHz is amazing! You must be a lucky owner of a great chip!
a b à CPUs
a b K Overclocking
December 8, 2009 12:50:37 PM

Quote:
jerreece:
And frankly I need to reapply my AS5, because two cores are about 5C less than my hottest.


Quote:
bubbatran209:
wow.. Maybe I need to reapply the artic silver 5 too... Mine is about 5c off also.


I tried that already, but the temp diff is still 5C on average. Hence, don't waste your time doing it. ;) 

@3.6GHz, 100% Load, 18C Ambient:
51C 48C 48C 46C
January 28, 2010 5:30:40 AM

I have a i5-750 on Gigabyte mobo (P55-UD3) and I noticed the same 5C difference between the cores thus only on idle, on full load the temps are fairly even.

I run into a other problem with temperature sensors displayed differently of different programs. Now the dilemma is what the real temperatures are on my board? Seems that EasyTune6 (Gigabyte utility) and HWMonitor report values with 10 C lower then RealTemp and CoreTemp. Which one is right...?
Maybe you have a similar problem on your board? Just out of curiosity, bubbatran209, witch program you used to monitor temp on your board? And how can you make sure the displayed temps are the real ones?

I posted a full review of my setup here http://www.silentpcreview.com/forums...ic.php?t=57310
a b à CPUs
a b K Overclocking
January 28, 2010 12:14:15 PM

What are your full load temps?
January 29, 2010 8:25:24 AM

I think i solved the temperature readings. It turned out that CoreTemp and RealTemp programs are reading sensors from CPU and EasyTune6 and HWMonitor are reading sensors from the motherboard. Of course the correct ones are CoreTemp and RealTemp. Looks like my system is not that cold I though it is... :( 

Ambient temp = 25C
Idle temp = 32 C
Full load temp = 64 C
February 1, 2010 9:52:45 AM

It turned out that one of the Intel push-pins of the heatsink gets out of my mobo. I reinstalled everything and my CPU temp never go over 61C in the most stressful test.

- CPU TEMPERATURES (ambient temp = 26ºC)
o idle (166x9=1494MHz) = 28ºC (28, 25, 25, 25 for each core)
o full load (166x20=3320MHz) = 61ºC (59, 61, 59, 59 for each core after 22 min. of IntelBurn Test at Maximum stress level)
February 24, 2010 7:29:21 PM

Wow, it is hot 80 deg C. Running L4D2 or 3Dbenchmark06 have not gotten the temps over 56 deg C so far.

Intel(R) Core(TM) i5 CPU 750 @ 3885GHz
Win7 home premium 64x
Sapphire Radeon HD 5770
Memory G.SKILL F3-17066 DDR3 4GB
PSU Corsair TX750W
CPU Clock Ratio: 21 X
BCLK Frequency(Mhz): 185
Load-Line Calibration: Enabled
All voltage: auto

CPU Cooling: Corsair Hydro Series H50

Results: 17954 3DMarks
Room Temp 24.0°C
Max temps:
Core 0 Temp. 55.0°C
Core 1 Temp. 54.0°C
Core 2 Temp. 56.0°C
Core 3 Temp. 55.0°C
February 24, 2010 8:13:24 PM

@ you guys with 5C difference in temps between cores - if the difference is 5C both at idle and full prime load I wouldn't worry about it. It could just be a poorly calibrated sensor in the chip. Was awfully common back in the ddr1 days of amd x2 chips, and not exactly unheard of in intels chips.
February 25, 2010 12:32:58 AM

I have the best overclock for an Intel i5 750 2.66Ghz to 4.01Ghz So far.
here is a video
http://www.youtube.com/watch?v=sUa1UASQHk0

Also this photo as the latest 3D Mark06 score that is 23449






Intel Core i5 750
Windows 7 (6.1) Ultimate Edition (Build 7600)
CPU Arch : 1 CPU - 4 Cores - 4 Threads
CPU PSN : Intel Core i5 CPU 750 @ 2.67GHz
CPU EXT : MMX, SSE (1, 2, 3, 3S, 4.1, 4.2), EM64T, VT-x
CPUID : 6.E.5 / Extended : 6.1E
CPU Cache : L1 : 4 x 32 / 4 x 32 KB - L2 : 4 x 256 KB
CPU Cache : L3 : 8192 KB
Core : Lynnfield (45 nm) / Stepping : B1
Freq : 4009.2 MHz (211.01 * 19)
MB Brand : Gigabyte
MB Model : P55-USB3
NB : Intel DMI Host Bridge rev 11
SB : Intel P55 rev 06
GPU Type : Radeon HD 5850
GPU Clocks : Core 157 MHz / RAM 300 MHz
DirectX Version : 11.0
RAM : 4096 MB DDR3 Dual Channel
RAM Speed : 633 MHz (2:6) @ 9-9-9-23
Slot 1 : 1024MB (10700)
Slot 1 Manufacturer : Crucial Technology
Slot 2 : 1024MB (10700)
Slot 2 Manufacturer : Crucial Technology
Slot 3 : 1024MB (10700)
Slot 3 Manufacturer : Crucial Technology
Slot 4 : 1024MB (10700)
Slot 4 Manufacturer : Crucial Technology
February 25, 2010 12:41:22 AM

bubbatran209 said:
Thermaltake Element G
Gigabyte P55A-UD4P
Intel i5 750
Win7 Ultimate 64x
Corsair H50 cpu cooler
Corsair ddr3 4x2gb 1600
Sapphire HD5770 gpu
Seagate 500gb HDD
Corsair 650w psu

Does anyone know what's the danger temp zone for the i5-750? I'm trying to oc my i5 to 3.8 and is testing it with prime95, temp are reaching into the 80's c. I only have it at 1.2v for core. Need some help please...


Ok I have answer for you, if you are going to overclock the CPu to 3.8GHz, it's best if you setting the voltage

Processor Core Voltage: Standard is 1.2v and Max is 1.4v (Used Load-line Calibation) and manual set the voltage for the cpu to 1.398v or 1.4v
Uncore Voltage: Standard is 1.2v and Max is 1.35v (Set it to 1.35)
Memory Voltage: Standard is 1.5v and Max is 1.65v (set it to 1.65)
PLL voltage: standard is 1.8v and Max is 1.880v ( Set it at 1.880v)

Now the Load-Line Calibation (enabled) will help as well.

This will help temps stay and a good range of 60C to 66C
You need to set this voltage in order to balance the temps or it would fail/get hot
Here is a Video of how I did it in my video and I am at 4.0GHz
http://www.youtube.com/watch?v=Lb_m3CXkjEo
February 25, 2010 12:46:53 AM

Pizeer said:
Wow, it is hot 80 deg C. Running L4D2 or 3Dbenchmark06 have not gotten the temps over 56 deg C so far.

Intel(R) Core(TM) i5 CPU 750 @ 3885GHz
Win7 home premium 64x
Sapphire Radeon HD 5770
Memory G.SKILL F3-17066 DDR3 4GB
PSU Corsair TX750W
CPU Clock Ratio: 21 X
BCLK Frequency(Mhz): 185
Load-Line Calibration: Enabled
All voltage: auto

CPU Cooling: Corsair Hydro Series H50

Results: 17954 3DMarks
Room Temp 24.0°C
Max temps:
Core 0 Temp. 55.0°C
Core 1 Temp. 54.0°C
Core 2 Temp. 56.0°C
Core 3 Temp. 55.0°C




Processor Core Voltage: Standard is 1.2v and Max is 1.4v (Used Load-line Calibation) and manual set the voltage for the cpu to 1.398v or 1.4v
Uncore Voltage: Standard is 1.2v and Max is 1.35v (Set it to 1.260v - 1.2900v)
Memory Voltage: Standard is 1.5v and Max is 1.65v (set it to 1.500v)
PLL voltage: standard is 1.8v and Max is 1.880v ( Set it at 1.800v)
Then try to down the voltage little bit at a time until you get the right low voltage.
Yes I am going backwards

Now the Load-Line Calibation (enabled) will help as well.

This will help temps stay and a good range of 60C to 66C
You need to set this voltage in order to balance the temps or it would fail/get hot
Here is a Video of how I did it in my video and I am at 4.0GHz
http://www.youtube.com/watch?v=Lb_m3CXkjEo

Also you are using a 21x multiplier and if you want better score that 17954
It's best if you change that multiplier to either 20x or 19x and manual set the voltage as I'd wrote here
But still enables Load-line calibation
February 25, 2010 1:13:47 PM

Keiki646 said:
Processor Core Voltage: Standard is 1.2v and Max is 1.4v (Used Load-line Calibation) and manual set the voltage for the cpu to 1.398v or 1.4v
Uncore Voltage: Standard is 1.2v and Max is 1.35v (Set it to 1.35)
Memory Voltage: Standard is 1.5v and Max is 1.65v (set it to 1.65)
PLL voltage: standard is 1.8v and Max is 1.880v ( Set it at 1.880v)

Now the Load-Line Calibation (enabled) will help as well.

This will help temps stay and a good range of 60C to 66C
You need to set this voltage in order to balance the temps or it would fail/get hot
Here is a Video of how I did it in my video and I am at 4.0GHz
http://www.youtube.com/watch?v=Lb_m3CXkjEo

Also you are using a 21x multiplier and if you want better score that 17954
It's best if you change that multiplier to either 20x or 19x and manual set the voltage as I'd wrote here
But still enables Load-line calibation


==========================================================================================
Cool Video Keiki646

I'm not yet an expert in O/C but your help is appreciated.
I have prime 95 to test but when I start it, I only have 4 test running and most forums and video
we see on the net talk about running 8 tests at the same time. Why?
What is the best core temp software? I use Core Temp rev. 0.99.5.27 - 64bit.
I'm not comfortable with memory O/C also. Like I said earlier, I'm using Memory G.SKILL F3-17066 DDR3 4GB:
CAS Latency Time: 9
tRCD: 9
tRP: 9
tRAS: 24

You say voltage and multiplier would make a difference?

I'll test that.

Thank you.
February 27, 2010 2:38:56 AM

Here are my last test setting.
It's too bad that all overclocking test we see don't give us Bios settings.
So here are my settings, if that can help others.

O/C #6 @4.0GHz, 19 X 213

So far very stable into One hour of L4D2

Intel(R) Core(TM) i5 CPU 750 @ 3885GHz
Gigabyte P55A-UD4P
Bios F8
Win7 home premium 64x
Sapphire Radeon HD 5770, Catalyst™ Version: 10.2

Memory G.SKILL F3-17066 DDR3 4GB

Cooling:
Coolermaster Haf 922
Corsair TX750W
Case fans: 2 X 200 mm
Corsair Hydro Series H50
Sapphire Radeon HD 5770

CPU Clock Ratio 19X
QPI Clock Ratio X32
BCLK Frequency(Mhz): 213
Intel(R) Turbo Boost Tech: Enabled
CPU Cores Enabled: All
CPU Enhanced Halt (C1E): Disabled
C3/C6/C7 State Support: Auto
CPU Thermal Monitor: Auto
CPU EIST Function: Disabled
Bi-Directional PROCHOT: Auto
Extreme Memory Profile (X.M.P.): Disabled
System Memory Multiplier (SPD): 10.0
Memory Frequency(Mhz): 2130
Performance Enhance Extreme
DRAM Timing Selectable (SPD): Expert
>>>>> Channel A Standard Timing Control
DRAM Frequency: 1065.0 MHz
CAS Latency Time: 9
tRCD: 9
tRP: 9
tRAS: 24
>>>>> ATI Overdrive
CPU Clock: 870 MHz
Memory Clock: 1350 MHz
Advanced Voltage Settings
>>> CPU
Load-Line Calibration: Enabled
CPU Vcore: 1.39375V
Dynamic Vcore (DVID): Auto
QPI/VTT Voltage: 1.330V
>>> MCH/ICH
PCH Core: Auto
CPU PLL 1.800V
>>> DRAM
DRAM Voltage: 1.640V
DRAM Termination: Auto
Ch-A Data VRef.: Auto
Ch-B Data VRef.: Auto
Ch-A Address VRef.: Auto
Ch-B Address VRef.: Auto

Room Temp: 22.5°C
Core 0 Temp.: 56.0°C
Core 1 Temp.: 55.0°C
Core 2 Temp.: 57.0°C
Core 3 Temp.: 55.0°C
a b à CPUs
a b K Overclocking
February 27, 2010 2:56:57 AM

Here's INTEL'S absolute max recommendation for your voltages, like anything else it's your computer and if you want to run your VTT well above Intel's absolute MAX completely up you guys.

Intel Data sheet

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February 27, 2010 5:19:19 AM

Pizeer said:


Load-Line Calibration: Enabled
CPU Vcore: 1.39375V


Wow, you have guts! Running voltages beyond the intel absolute max, and running vcore that high with LLC enabled!

Sheesh, keep us posted. It will be interesting if your equipment can take that abuse.

Not sure I'd recommend this to "help" anyone else thou, certainly not for awhile!
February 27, 2010 9:35:17 PM

bubbatran209 said:
Thermaltake Element G
Gigabyte P55A-UD4P
Intel i5 750
Win7 Ultimate 64x
Corsair H50 cpu cooler
Corsair ddr3 4x2gb 1600
Sapphire HD5770 gpu
Seagate 500gb HDD
Corsair 650w psu

Does anyone know what's the danger temp zone for the i5-750? I'm trying to oc my i5 to 3.8 and is testing it with prime95, temp are reaching into the 80's c. I only have it at 1.2v for core. Need some help please...



===================================================================================================

I was thinking about your problem.

Make sure the H50 pump is plugged onto SFAN1 motherboard connection and not onto CPUFAN1, because you always want
full power to the pump. If you're connected onto CPUFAN1 and CPU Smart FAN Control is enabled then maybe your pump is not running at its best.
February 28, 2010 5:09:56 PM

bob5568 said:
Wow, you have guts! Running voltages beyond the intel absolute max, and running vcore that high with LLC enabled!

Sheesh, keep us posted. It will be interesting if your equipment can take that abuse.

Not sure I'd recommend this to "help" anyone else thou, certainly not for awhile!



===========================================================================================

You got that right, I'm paying for my stuff and I know the risks.
Other then that, anyone that overclock must know that there is a possibility that damage can occur when overclocking.

Thanks bob5568 and RJR for your inputs.
I'm not an expert overcloker but I've been reading a lot and I just got my new system especially to test overclocking.

I've read that I should keep the QPI/VTT Voltage within 0.5V of the memory voltage. What do you think?

Leaving my setup the way it was and bringing the QPI/VTT Voltage down to 1.21V got me a bleu screen at start up.

Like you said, I'm not running 1.330V all the time but for test purpose.

I'll keep testing and have fun doing it.

Thks again.
February 28, 2010 6:30:17 PM

Pizeer said:
===========================================================================================

anyone that overclock must know that there is a possibility that damage can occur when overclocking.


I've read that I should keep the QPI/VTT Voltage within 0.5V of the memory voltage. What do you think?

Leaving my setup the way it was and bringing the QPI/VTT Voltage down to 1.21V got me a bleu screen at start up.

Like you said, I'm not running 1.330V all the time but for test purpose.


Thks again.


Ya, its true that overclockers have some risk in general, but I imagine the engineering voltage limits should be respected. This has been the method of overclockers for as long as I remember. We tweak as much as possible while remaining at voltages no higher than engineering max, and temps no higher than engineering max.

I agree with keeping vtt within .5v of memory voltage. I also understand you will get a blue screen with vtt at 1.21 and attempting to set bclc as high as you have it. Its a limitation of the chipset. My answer is to accept the limitation and lower bclk. Your's may be to bust the max voltage spec issued by engineering. Your choice, but I'd say you are now not overclocking with the mainstream set of ideas. Perhaps you will prove the engineers wrong! Keep us informed. You are like a canary in the cage.

As far as enabling LLC, you should do some reading. This setting removes protections against transient spikes that occur when you change your system loading significantly. Your settings force the computer to give away its safety. That's no big deal with lower vcore, but combining that setting AND a high vcore, that's risky.

Now, enjoy and have fun, but with knowledge. Please don't rma your equipment if it fails, that wouldn't be fair to the manufacuterers.

Cheers,
Bob
!