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Help get 4.0 GHz stable on i5 750

post #1 of 45
Thread Starter 
Hi fellow overclockers.

I just recently joined this community, which means today however did lurked around alot to gather some informations regarding overclocking specifically for my setup.

I have been trying to find the stability on my cpu but without any luck so far. I did some various test increasing vcore and VTT mainly but with no stability so far. I have written down the tests I've made with different voltage.

One problem I noticed during the increment of the Vcore was that when I put it at 1.37500V (bios voltage) and ran LinX it would start making static noise at 4 min mark coming from the cpu however I do believe it would go away shortly but did not go further and stopped the test.

Hope there is some one out there who might be able to help me out reaching stability at 4.0GHz if possible at all with my CHIP which I believe is not that good :S

The last test (TEST 8 on 01-06-11) my temperature was reaching 78 degree which I find it to be very high or is it normal for my NH-D14?

EDIT:
TURBO BOOST [DISABLED]
C1E [DISABLED]
C3/C6 State Support [ENABLED]
CPU EIST Function [DISABLED]

Multiplier: 20
BCLK: 200
Memory Multiplier: 8

Memory Frequency: 1600MHz

31-05-11


01-06-11

Edited by yellowbeast - 6/2/11 at 9:06am
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post #2 of 45
VCORE is safe up to 1.45v
raise VTT to 1.3v
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post #3 of 45
Thread Starter 
Should I try ignore at the point where static sounds begins to occur when I bump above 13750V. I I do belive that the static only happens shortly during on a specific time on linx test.
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post #4 of 45
Thread Starter 
Vcore1,3875
VTT1,31
PCH1,05
PLL1,8
vDimm1,66
Error Linx (5:15)
Static sound occured
Temp 78

Raising VTT did not help...Should I keep bumping up on VTT? 1.4v is max right?
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post #5 of 45
Not quite sure what you mean by "static sound" but I'd be looking into it. Might just be a fan increasing speed. I'd just check to make sure all are working as they should. Wouldn't want a fan going out and not know it while stability testing. Side note all fans should be running full out while stability testing to start with.



What is your memory frequency, base clock, & cpu ratio ?
Edited by ~sizzzle~ - 6/2/11 at 6:51am
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post #6 of 45
Thread Starter 
my fans are all connected to a manual voltage adjustment and I am giving them full speed. When I use LinX, the buzzing/static sound occurs and I believe it comes from the cpu so it cant be from my fans if they are on full speed even on idle.

However I am running Linx again and completed 2 runs so far with these configs:

Vcore1,4 (CPU-Z shows 1,376V)
VTT1,31
PCH1,05
PLL1,8
vDimm1,66

EDIT: the buzzing sounds worries me though but cant find any informations on the problem so far..
3 runs completed so far...
Edited by yellowbeast - 6/2/11 at 7:03am
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post #7 of 45
Probably just some capacitor squeel taking a wild guess. Annoying but not always a huge deal. Caps can and do blow up but usually just on unheatsinked lower end 4 phase power mobos.
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CPUMotherboardGraphicsRAM
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WD Black 640GB Crucial M4 SSD Corsair 840 SSD Seagate  
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CPUMotherboardGraphicsRAM
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Monster IIr
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CPUMotherboardGraphicsRAM
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WD Black 640GB Crucial M4 SSD Corsair 840 SSD Seagate  
Optical DriveCoolingOSMonitor
Samsung Cogage Arrow Windows 7 Alienware AW2310 
MonitorKeyboardPowerCase
Dell ST2410 BlackWidow Ultimate Corsair 850TX CM Sniper 
MouseMouse PadAudioAudio
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CPUMotherboardGraphicsRAM
i5 760 EVGA P55 FTW XFX 5850 Mushkin Blackline 4GB 
Hard DriveOptical DriveCoolingOS
Caviar Blue 640 Asus Corsair A70 Windows 7 
MonitorKeyboardPowerCase
Dell ST2410 Rosewill RK-800G Seasonic M12II 620 NZXT Gamma 
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post #8 of 45
Thread Starter 
If that is the case I guess there is nothing I can do about it.

Test failed after 6 runs now, taking 38 mins to run. This is still an improvement for me however my Vcore is very high :S

I will try bump it still see if it works ... but my noctua is reaching its limits as well with the temperature of 78 :S
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i5 750 @ 3.8GHz ~1,312v Gigabyte P55A-UD3 rev.1 HD 5850 Premium 8GB Corsair xms3 1600 CL9 
Hard DriveOSMonitorKeyboard
Vertex 3 120GB, HD103UJ(1TB), HD501LJ(500GB) Windows 7 64bit BENQ G24HDBL Zowie Celeritas 
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post #9 of 45
if you get error 124 frequently its either you are lacking QPI/VTT or you are having a higher value for the said field try playing with values..it does not mean that if you get that error you should raise the VTT..for vcore IMHO its too much..i did 4ghz with mine with just 1.27v and 1.3v on VTT with a DDR3 1600mhz cas 7..
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post #10 of 45
Thread Starter 
you must have a very good chip and I got a bad one... either way I will try what you are suggesting... going with these configs:

Vcore1,3 (1,28)
VTT1,31
PCH1,05
PLL1,8
vDimm1,66

EDIT: Did not work.. 30 sec into Linx Test my computer froze... but from here I can try raise Vcore and see where it leads..
Edited by yellowbeast - 6/2/11 at 8:01am
World of Gaia
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CPUMotherboardGraphicsRAM
i5 750 @ 3.8GHz ~1,312v Gigabyte P55A-UD3 rev.1 HD 5850 Premium 8GB Corsair xms3 1600 CL9 
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Vertex 3 120GB, HD103UJ(1TB), HD501LJ(500GB) Windows 7 64bit BENQ G24HDBL Zowie Celeritas 
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World of Gaia
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CPUMotherboardGraphicsRAM
i5 750 @ 3.8GHz ~1,312v Gigabyte P55A-UD3 rev.1 HD 5850 Premium 8GB Corsair xms3 1600 CL9 
Hard DriveOSMonitorKeyboard
Vertex 3 120GB, HD103UJ(1TB), HD501LJ(500GB) Windows 7 64bit BENQ G24HDBL Zowie Celeritas 
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