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i5 750 4ghz setup

post #1 of 17
Thread Starter 
Anyone knows what voltage and vtt is good for an i5 750 at 4ghz?
I have a Noctua NH-D14 as cooler and MSI P55-GD65 motherboard.

I tried with 1,415v in the bios, but cpu-z reports only 1,384v and in prime95 it drops to 1.312 - 1.320 and one core fails.

And also I want to know what is safe for VTT as I know that for vcore at 1,4v you go further than the safe side.
i5
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i5
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post #2 of 17
hey dood ive got the same board and th 760 my volts are 1.35
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post #3 of 17
Try turning off v droop in bios? Also there's a guide to overclocking the I5 series processors somewhere on OCN thats pretty good.
Nasty Girl
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Nasty Girl
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post #4 of 17
Thread Starter 
what is the purpose of vdroop?
if it is bad why is it on by default?
i5
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i5
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Mushkin Callisto 60GB SSD + Samsung Spinpoint F... Asus DRW-24B1ST Noctua NH-D14 Windows 7 Ultimate X64 
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post #5 of 17
Vdroop stops the volts from dropping Under load.

(Set 1.4v in bios, it usually drops to 1.33-1.35v under load....VDroop Stops this...With magic or something....I don't know the details?..Point is, its good...)
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Teletraan-1
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post #6 of 17
I had my Core i5-760 stable at 4.0 GHz at 1.375v. When I upgraded to my Core i7-870, I was able to get 4.0 GHz stable at around 1.325v (or something around there). I had to play with some other voltage settings to get a stable OC with the lower VCore.
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post #7 of 17
Its supposed to prevent it from dropping at stock clocks but in my experience with it overclocking it over compensates for voltage changes and will send your voltage all over the place. Disable all the intel speedstep and c1e stuff as well, then start re enabling 1 at a time till you figure out which one it is thats causing your voltage issue. A good starting point for that chip is to just set your bclk (fsb) to 200 and multiplier to 15 or so, just using the multiplier and voltages to get up to the speed you want from there and then back voltages off accordingly. Once it wont clear post you found your lowest voltage setting then play with it to find the happy medium between temp, performance and stability. Oh yeah and read the guide on ocn about it smile.gif.
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Nasty Girl
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Gkill Phoenix Pro SSD Samsung Spinpoint F3 LG Super-multi BDROM Cooler Master V8 
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post #8 of 17
Hi there, before i upgraded to SB platform i was using i5 750 4ghz on MSI P55 GD80, stable for +5months without BSOD or freeze then i sold it to myfriend, i used vcore 1.28volt, Vtt 1.25volt stable IBT 20loop maximum level, btw i use 1333mhz oced to 1600mhz with 1.65volt.... all stable....btw u should set LLC to disabled, if u used enabled then when under load ur vcore will drop more lower.
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post #9 of 17
Thread Starter 
So I should increase the VTT aswell. Is 1,25v safe? I wish it won't kill anything in time. And also keep the vdroop on.
i5
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Intel Core i5 750 @3,2 ghz ASRock P55 PRO Gigabyte GTX 560 WindForce Corsair Vengeance 8GB DDR3 1600MHz CL9 
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Mushkin Callisto 60GB SSD + Samsung Spinpoint F... Asus DRW-24B1ST Noctua NH-D14 Windows 7 Ultimate X64 
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LG W2261VP 22" 1080p 2ms Logitech G11 Corsair CMPSU 650TXEU CoolerMaster HAF922 
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i5
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CPUMotherboardGraphicsRAM
Intel Core i5 750 @3,2 ghz ASRock P55 PRO Gigabyte GTX 560 WindForce Corsair Vengeance 8GB DDR3 1600MHz CL9 
Hard DriveOptical DriveCoolingOS
Mushkin Callisto 60GB SSD + Samsung Spinpoint F... Asus DRW-24B1ST Noctua NH-D14 Windows 7 Ultimate X64 
MonitorKeyboardPowerCase
LG W2261VP 22" 1080p 2ms Logitech G11 Corsair CMPSU 650TXEU CoolerMaster HAF922 
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post #10 of 17
I am curious but what was your temperature with 1,415v with your noctua ND-D14? or just in general?
World of Gaia
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World of Gaia
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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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