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i5 750, 4.0Ghz and above.. Suggestions?

post #1 of 25
Thread Starter 
Yet another i5 750 4.0Ghz topic, i know.. But i would really like some assist on getting my i5 750 stable.

I have been trying to get my i5 750 on 4.0Ghz, been trying for days now and i'm wondering what i'm doing wrong. I first thought it was my RAM that caused trouble but i still hit the wall with my new sticks, i think its my mainboard that scews me, why? because i can only adjust increments of 0.5 in the BIOS which blows imo...

I started with:

20x200
Vcore: 1.35000v
IMC: 1.25
DRAM: 1.50 (stock)
Timings: 9-9-9-24 / 1600Mhz (stock)
Everything disabled, LLC on AUTO.

Tried a 5x Linx run to get a first indication if its stable or not and to see temps. Above settings failed at 2nd test in Linx.

I have been adding Vcore and IMC untill:

Vcore: 1.38750v
IMC: 1.30
LLC: AUTO

It passed 5x Linx with temps high ~80c, this feels to warm to my liking considering its only 5x Linx so temps will probably raise even more. Ofcourse high temps are due to a pretty high Vcore of 1.38750v (I suppose?) Turning LLC off lowers my temps a little but results in a unstable OC on same voltage settings.

I tried to lower my Vcore / IMC to get better temps but nothing seems succesfull. What am i overseeing guys? i have seen temps of around 70c / 75c under load on 4.0Ghz from people with same/simular CPU cooling as me (Corsair H50, Gentle Typhoon x2, p/p with shroud, pump and fans running on max) What am i doing wrong? Is it my Asus board playing a game with me?

Any suggestions/help is much appreciated! This is driving me crazy..
Edited by rck1984 - 4/8/11 at 9:10am
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post #2 of 25
Yeah, I wouldn't go above 80c. I haven't really studied up on the i5 series before, but does can you turn on turbo boost? Try doing that and then trun llc off. Then set the fsb to 190.

No cpu is the same though. Maybe you just got a bad batch.
    
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post #3 of 25
Turn llc on, lower your ram multiplier to the lowest it will go. Then bump up the ram voltages up to around 1.56

have you tried bumping up pll and pch core? Bump those up a a notch above stock and see if it helps.

http://benchmarkreviews.com/index.ph...=583&Itemid=38

Read that it helped me alot. Restart from step on in the guide and it will help eliminate possible ram problems and etc. Because the way your overclocking you do not know if the ram is instable or the overclock is instable or what.
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post #4 of 25
Thread Starter 
Thanks for the reply's, i am gonna read the article and try some settings.
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post #5 of 25
id list my settings but it wont help much im afraid, EVGA boards vastly differ from asus :/
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post #6 of 25
Thread Starter 
Quote:
Originally Posted by PCSarge View Post
id list my settings but it wont help much im afraid, EVGA boards vastly differ from asus :/
It might help to get an indication, but i have the feeling i did everything right.. weird.

Like i said the thing i dont like is the fact i can only adjust with 0.5v.
For example, either 1.25 IMC or 1.30 IMC, nothing in between. Same counts for all voltages.

Frustrating, but i am trying some settings now.
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post #7 of 25
Quote:
Originally Posted by PCSarge View Post
id list my settings but it wont help much im afraid, EVGA boards vastly differ from asus :/
Quote:
Originally Posted by rck1984 View Post
It might help to get an indication, but i have the feeling i did everything right.. weird.

Like i said the thing i dont like is the fact i can only adjust with 0.5v.
For example, either 1.25 IMC or 1.30 IMC, nothing in between. Same counts for all voltages.

Frustrating, but i am trying some settings now.
Yeah our motherboards certainly give us more control over things like that that yours does apparently.

I got lucky with my batch... not everyone's chip is the same!
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post #8 of 25
Try to use odd-numbered multipliers for these chips, they do funky things with even ones (like your x20).
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post #9 of 25
Quote:
Originally Posted by Plex View Post
Try to use odd-numbered multipliers for these chips, they do funky things with even ones (like your x20).
then mine should be funky? im running 20x200 o.o stable for the longest time.

*sings* wooo ohhh ohhh for the longest time
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i5 750 EVGA P55 Classified 200 XFX Radeon 6850 Refrerence XFX Radeon 5770 XXX 
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post #10 of 25
Quote:
Originally Posted by Cavi View Post
Yeah our motherboards certainly give us more control over things like that that yours does apparently.

I got lucky with my batch... not everyone's chip is the same!
this i can second on...alot of asus boards are too simplified for my liking o.o i like my P55 FTW
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2x Factory S3 Steel Cowl Case 
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i5 750 EVGA P55 Classified 200 XFX Radeon 6850 Refrerence XFX Radeon 5770 XXX 
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16GB Kingston HyperX Genesis DDR3 WD Caviar RE 250GB Coolermaster Hyper 212+ windows 7 64 bit 
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Orange Angel
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BOINC me! (TM)
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CPUMotherboardGraphicsRAM
i5 2500k @ 4.8Ghz ASUS P8Z77-I Deluxe  Visiontek RX 480 [EK FC nickel/Acetal] 16GB Mushkin Blackline 2133mhz @11-11-11-31-1T 
Hard DriveHard DriveHard DriveCooling
Samsung 840 EVO 120GB Crucial M300 1TB Seagate Firecuda 2TB EK Supreme LTX CSQ [Canadian Special Edition] 
CoolingCoolingCoolingCooling
MCP 35X 10W W/ EK CSQ X-TOP EK Coolstream PE 240 Bitspower Multi Tank 80 Bitspower Matte Black Rotary Fittings/ Feser Ma... 
OSMonitorMonitorKeyboard
Windows 10 Professional 64-Bit Samsung 32 Inch 4K TV Acer S231H NKPC V60 65% custom  
PowerCaseMouseMouse Pad
Corsair HX750 Fractal Design Define Nano S Razer Deathadder 2013 Stelseries QCK+ 
AudioOther
Astro A40 TR+ Mixamp Pro AKRacing Arctica Gaming Chair 
CPUCPUCoolingPower
Antminer S3 Antminer S3 4x Cougar Vortex V12-HP PWM Fans EVGA 500B 500W PSU, Corsair GS700 700W PSU 
Case
2x Factory S3 Steel Cowl Case 
CPUMotherboardGraphicsGraphics
i5 750 EVGA P55 Classified 200 XFX Radeon 6850 Refrerence XFX Radeon 5770 XXX 
RAMHard DriveCoolingOS
16GB Kingston HyperX Genesis DDR3 WD Caviar RE 250GB Coolermaster Hyper 212+ windows 7 64 bit 
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