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First (semi)stable overclock, got some questions...

post #1 of 4
Thread Starter 
Hi everyone, been lurking a lot and am in the process of getting a stable OC for my i5-750. My specs are as follows:

Mobo: Asus P7P55D Pro
CPU: i5-750 @ 2.66GHz
RAM: 8GB @ 1440MHz (9-10-10-27) (Rated @ 9-9-9-25 1600MHz)
BCLK:180
MULT: x20
EIST,C1E: Enabled
Turbo Boost: Disabled
Intel C-State Tech: Disabled
Vcore: Offset Mode
Offset: 0.1V
Vload: 1.256V
Vidle: 0.986V (not sure, running Prime95 right now)

These are the tests that I have run:

IBT High - 20x
Memtest86+ - 1 pass
Prime95 (Small FFT's) - 6hr no errors
Prime95 (Large in place) - 6hrs no errors

Only test that brings up errors is Prime95's "Blend" option, I usually get an error an hour into it, this was at an offset voltage of +0.0875V, I have now bumped up the voltage offset to +0.1V, have been running the Blend test for 2 hours with no errors yet. So I was wondering if I should manually input my memory timings even though I'm not running the memory at 1600MHz? Or do I have to run the memory at 1600MHz to use the 9-9-9-25 timings? Is there a significant difference to running them at the rated timings vs having my Mobo do it automatically for me (as it is now)?

My understanding of voltage offset is that the value I input (in this case +0.1V) would be added onto the Vid? I'm assuming Vid is voltage at stock settings? Which for me was ~1.2V, so making my offset voltage 1.3V, is this assumption correct? I'm confused about the load voltage only being 1.256 - 1.27V, but I seem to fail tests with offsets < 0.1V? Is there some kind of overhead I'm not taking into account that also feeds off of Vcore? Am I even using the voltage offset correctly??

Also in speedfan I see two Vcore voltages, one is 1.26V and the other 1.30V are these min and max values or something? I've searched online and have seen that for some people it's their RAM voltage, however I'm pretty certain my RAM is running at 1.5V+, does anyone know what these two values are?

I'm sorry if this seems like I'm all over the place, any input is greatly appreciated!
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Almost Legit
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post #2 of 4
Overclock the CPU first and manually input your ram but keep the speed, volts and timing at stock. After you have a stable CPU overclock, then start with the ram overclock.

Blend in Prime95 test both CPU and ram together. Since you are overclocking both CPU and ram at same time, you will not know what is causing the issue.

You are correct about how the offset works.

Yes, in speed fan it will first indicate idle value and while at load the volts will fluctuate between low and high loads.

Also, I've overclocked my i5 750 in my Sarabera build, in sig, so check out details of my overclock there for more tips.
Edited by Gunderman456 - 10/12/12 at 8:53pm
 
BitoHeaven
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BitoHeaven
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Cigar ATX PC
(14 items)
 
CPUMotherboardGraphicsGraphics
Intel i7 4770k @ 4.5GHz Asus Maximus VI Gene Gigabyte R9 290 @ 1160MHz/1350MHz Gigabyte R9 290 @ 1160MHz/1350MHz 
RAMHard DriveHard DriveOptical Drive
G.Skill Trident X 2X8GB DDR3 2400MHz Samsung 840 PRO 256GB  Seagate Barracuda 7200.14 3TB SATA III 6Gb/s 64... Pioneer Blu-ray Burner 
CoolingOSMonitorKeyboard
Liquid Single Loop Triple Radiators Win 7 SP1 Professional x64bit  Samsung SynchMaster 24" Widescreen 1200p TFT-LC... Logitech G15 
PowerCaseMouseMouse Pad
EVGA SuperNOVA G2 1300w 80+ Gold Fully Modular  Fractal Design Arc Midi R2 Microsoft Sidewinder X5 Allsop Redmond Mouse Pad 
Audio
Cambridge Soundworks 5.1 
CPUMotherboardGraphicsRAM
Intel Core i5-3570K @ 4.6GHz ASRock Z77E-ITX mITX  Sapphire HD 7990 @ 1090MHz/1600MHz G.SKILL Ripjaws 2X4GB DDR3-1600 @ 1866MHz 
Hard DriveHard DriveOptical DriveCooling
Crucial SSD 128GB mSATA SATA III 6GB  Seagate Barracuda 7200.12 1TB SATA II 32MB 7200RPM LG DVD R/W SATA with LightScribe Corsair Cooling Hydro Series H100 
OSMonitorKeyboardPower
Win 7 Professional x64bit Samsung 52" 1080p 60Hz LCD Logitech Wireless K330 Corsair AX850 Gold Fully Modular 
CaseMouseMouse PadAudio
BitFenix Prodigy Mini-ATX Black  Logitech Wireless M215 Corsair Vengeance MM200 Yamaha RX-V681 & PSB/Polk Audio 5.1 
CPUMotherboardGraphicsRAM
AMD Athlon II X4 640 ASRock N68C-GS NVIDIA 6600GT G. Skill Ripjaws DDR3 1600MHz 
Hard DriveOptical DriveCoolingOS
WD Caviar Blue 500GB 16MB Cache 7200RPM LG Optical Drive Thermaltake Max Orb Windows 7 
MonitorKeyboardPowerCase
Viewsonic 19” Flatscreen CRT Gigabyte GK-K6800 103  Thermaltake TR2 600W Cigar Boxes 
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post #3 of 4
Thread Starter 
Hi Gunderman, thanks for the reply.

I'm pretty confidant that I've found a stable overclock for my CPU (+0.0875 offsett @ 3.6GHz). I'm a little confused about the RAM part, so I should manually input the timings 9-9-9-25, but what do you mean by keeping the speed, volts and timing at stock? The stock frequency was 1366MHz, but with the BCLK I'm using I'm unable to achieve that frequency. Should I use lowest frequency available with stock timings and voltage (1080MHz, 9-9-9-25, 1.5V)?

I'm still a bit confused by the offset, and the actual load voltage. I need an offset of atleast +0.0875 to achieve system stability, but Vload only shows the CPU using 1.26V at most. Am I missing something fundamental?

Thanks for the help.
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Almost Legit
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G.Skill G.Skill G.Skill G.Skill 
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OCZ Agility 4 Samsung Spinpoint F3 Arctic Cooling Freezer 7 Pro Rev.2 Windows 7 Ultimate 64 
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post #4 of 4
Thread Starter 
Okay so just an update:

I have set my RAM to the lowest frequency allowed by my motherboard which is 1080MHz with 9-9-9-24 timings. I've been running IBT at Maximum settings for 20 passes. Currently running Prime94 Blend test, hopefully this passes as this is the test that I usually get errors on.

Here are the voltage offsets that I've tried with IBT:
+0.075V - failed
+0.0850V - failed
+0.0925V - failed
+0.1V - pass

Here are my actual voltages and OC settings:
OC: 3.61GHz (from 2.66GHz)
BCLK: 180
MULT: x20
Vcore: 1.2V
Voffset: +0.1V
Vload: 1.256V/1.272V/1.28V
Vidle: 0.992V
IMCv: 1.209V (auto)
DRAMv: 1.49V (auto)
PLLv: 1.815V (auto)
PCHv: 1.059V (auto)
BIOSv: 1.304V (CPU voltage when in BIOS)
RAM: 1080MHz @ 9-9-9-24

So, should I just leave the auto set voltages as they are, or should I try to tinker around with them myself? Would there even be any benefit to fine tuning the voltages? I don't understand why I need 1.3V Vcore for my system to be stable yet when under load the CPU only draws 1.28V max, with averages usually around 1.256V? Is there some kind of fundamental overhead voltage that I'm missing/not realizing? Should I attempt to run my RAM at the rated speeds (1600MHz @ 9-9-9-24)? I've also tried changing my BCLK and MULT to 200 and x18 in an attempt to run my RAM at 1600MHz, however when I try this configuration I usually BSOD either right before log in, or right after. I also noticed that my DRAM voltage is 1.8V+ when I try to run the RAM at 1600MHz (even though the website rates it at 1.5V @ 1600MHz) which seems extremely high to me. So should I just let it be?

I feel torn, I really want a rock solid system but I'm honestly getting pretty sick of constantly stress testing and messing with BIOS settings. Have been at this since Monday, I think I may just need to take a break from this.
Almost Legit
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OCZ Agility 4 Samsung Spinpoint F3 Arctic Cooling Freezer 7 Pro Rev.2 Windows 7 Ultimate 64 
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Almost Legit
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CPUMotherboardGraphicsGraphics
Intel Core i5 750 P7P55D PRO NVIDIA GeForce GTX 460 NVIDIA GeForce GTX 460 
RAMRAMRAMRAM
G.Skill G.Skill G.Skill G.Skill 
Hard DriveHard DriveCoolingOS
OCZ Agility 4 Samsung Spinpoint F3 Arctic Cooling Freezer 7 Pro Rev.2 Windows 7 Ultimate 64 
MonitorKeyboardPowerCase
Planar 27" LCD PX2710MW Razer Blackwidow Corsair 750W NZXT Hades 
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Logitech G9x Steel QcK+ 
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