Hello and thank you for stopping by.

I recently read the "EVGA P55 Overcklocking Guide" and got my CPU to 4,2 Ghz.
I ran some tests and got it quite stable. The thing is, I can't get it fully stable, because my CPU cores hits over 92°C!
The benchmark I ran when my Cores hit 92°C was LinX. I just ran LinX for 3 minutes until they got that hot.

When my computer idle, my CPU temp is around 40-44°C. Which seems a little high?
I had a chat with some people in the thread about this, and they suggested me to create a new one, so I did.
They have come to the conclusion that my H50 Hydro is not doing what it should be, cooling. Atleast I got it that way.

What is it then that could be wrong?
The way I mounted it?
The fan? (It's running at ~1700 RPM)
The Pump?

They also told me that alot of users have the same problem, so please, if you may know what it can be, please help me out here.

If you want to see what the other users said about it, you can find the thread here: http://forums.evga.com/tm.aspx?&m=20029&mpage=6

If you are willing to help, here are my current specs:

CPU:     Intel Core i7 860 @ 3,8GHz  (Still hits > 92°C in LinX)
Mobo:   EVGA P55 FTW
Cooler: Corsair H50 Hydro
RAM:     Corsair Dominator GT 1600MHz 7-7-7-20

Chassi: Fractal Design Define R2 Titanium

BIOS Settings:

DRAM Frequency: 1066 MHz
DRAM tCL:             9
DRAM tRCD:           9
DRAM tRP:             9
DRAM tRAS:           24
Command Rate:    1

CPU Frequency: 3800 MHz
CPU Multiplier: 19x
CPU Frequency: 200 MHz
PCIE Frequency: 104 MHz
QPI Frequency Selection: 4.270 GT/s

Bootup CPU VCore:   1.318750V
Eventual CPU VCore: 1.318750V
DIMM Voltage:            1.65V
Bootup CPU VTT:        1.35V
Eventual CPU VTT:      1.35V
PCH Voltage:              1.075V
CPU PLL VCore:          1.8V

C1E Support: Disabled
Intel SpeedStep tech: Disabled
Intel C-STATE tech: Disabled


Pictures of how the CPU Cooler is mounted: http://flayer.fisknylle.se/datorn/

I hope this information will help you help me :)

I really appreciate your help and thanks in advance / Flayer

VTT is actually quite low for i7 860 at 4.2ghz.

I think your temps are consistent with i7 heat versus H50 cooling.  The i7 is a very hot CPU past 4ghz because of the hyperthreading.

Things you can do to reduce the temps are:

Ensure the radiator fan sucks cool air from outside the case rather than warm air from inside.

Add a second fan to the radiator and if you add fan shroud spacers that will also improve the cooling performance.

Perhaps try a different thermal paste and ensure it is spread evenly over the CPU.

I guess your pump is powered from mobo fan header?  You must make sure the fan header is delivering full power to the pump.  If the pump has a molex power adaptor cable then power the pump from molex and see if that helps.

Finally the most extreme measure is to disable hyperthreading.  That will drop your temps by more than 10c.  HT doesn't make that much of a difference for most applications.  I have a profile at 4.3ghz with HT disable as well as 4ghz and 4.2ghz with HT enabled but I have a much more extreme/capable water system.

Feather is right your VTT is a bit low,I would add a second fan to the radiator in a push pull config,make the push fan run slower than the pull fan,also HT will make it run hot,my rig with HT enabled hits 79 to 80 easily,with it off 60 to 64..My temps at idle are 33 to 35..I also would make sure it is tight enough to the socket..

Flayer

Thanks for the answers everybody, I really appreciate them.
Ok, Ill try to add a second fan to the radiator, and I'll also use another power source for the pump.
The Corsair fan's max RPM is 1700, right? Atleast I can't get it to spin faster than that, and it always spins around 1650-1700 RPM.
I will try the different combinations as you all described and I'll come back with an edit and tell you all how it did go.
And again, thanks for your help.

yeah that is correct for fan speed, btw I see the pump connected to the PWR fan header is it set at 100%? The problem here is that idle temps are high so I dont think its a need for more fans but something else the H50 should have capacity for having that 860 at 30's C idle, what is your room temp? 


I suspect incorrect contact with the cpu or low pump rpms...

Can't you go down a little on VCore and VTT without losing stability?

with temps at 92c I would be checking for air in my cooling lines air bubble could be blocking flow or one time I forgot to take the clear film off the bottom of my water block when it was delivered temps were crazy

if it does have air in the line, on the H50 you can't do anything about it other than RMA it(I could be wrong).

You're welcome. Good luck.

Same here, H50 working great.
Similar temps as gamester5.

I pull air from outside the case, through a filter then the rad and it's barely hot coming out the other side.

Like the OP, after starting the system the first time, I flicked the hoses and there was some air bubbling, it seemed to settle and temps are great.

I expect that the system has a TINY amount of air - I heard bubbles 3 times at most after tapping on the hose, has never done it again.