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I7 920 OC

post #1 of 62
Thread Starter 
Hi all,

I know absolutely nothing about overclocking, but its about time I changed that. I have had an I7 920 for 3 years now, and have always meant to OC it, but never got around to asking how, so here I am.

I have:-

Intel I7 920
Asus Sabertooth
Corsair DDR3 1600 24Gb (yes I know its a lot, but it was only £7 more than 12Gb, so why not)
Arctic Cooling Freezer 7 Pro Rev 2 CPU Cooler
Xclio Blackhawk Black Full Tower
Tagan BZ1100 PSU

Ideally I would like to achieve 4 Ghz, but I guess anything approaching that would be great. How do I go about this please?
post #2 of 62
This is an idea for 4Ghz

Well lock the PCI-E to 100MHz
Set the CPU multi to x21
Set BLCK to 190
This gives you 4GHz.

Right, when you go up to this level of an overclock, you need more voltage otherwise the system will be highly unstable!

Set Vcore to 1.4v
Set CPU term to 1.38v
Set MCH to 1.3v

Also, when the BCLK is increased, the RAM speed will also change. If you set a high BCLK. your RAM might run too fast and cause the system to crash and be unstable. so for example if BCLK is at 100 and the RAM ratio is at x6, the ram will run at 600MHz.

Try this before reaching for 4Ghz!
This is to get just under 3.4Ghz
pci-e 100mhz
vcore 1.34v
CPU term 1.32v
MCH 1.24v
BCLK 160
RAM x10
CPU multiplyer x21


Right the temps increase massively when overclocking. Use realtemp to check the temps of the CPU. You will see 4 different readings. Always take the highest value as your temp. You also need to stress test the system for 8 hours using prime95 64bit (small FFToption, can be found once the software is downloaded)

Run it for 8 hours and make sure the temp does not go above 65c. if it does, abort. If your like a few hours into testing and the temp jumps to 67c lets say....you might as well just let it continue. Intel say the safe limit is 71c on that chip. Keep 65-68c as your max!!

Be careful, overclocking can damage your system. You have been warned. Use this information at your own risk. I or anyone else on the forum is not liable for damage you cause, as we can only advise you.
Just for your piece of mind, i ran a i7 920 at 4.4Ghz with HT enabled for seveal years.

Good luck, this is just a very simple guide to overclocking! remember, don't let that RAM run at a speed that's higher than 1600Mhz smile.gif My settings for 3.4Ghz set the ran to around that speed. This is why, bclk at 160, ram at x10 multi. 160x10=1600Mhz. Also, bclk at 160, cpu multi at x21. 160x21=1360Mhz (3.4Ghz-ish. just under)

Good luck.
X79-GCN
(22 items)
 
  
CPUMotherboardGraphicsRAM
Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 AMD R9-290X GEil Evo Potenza DDR3 2400MHz CL10 (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 120GB EK Supremacy (CPU) NF F12's P/P (360 Rad)  NF A14's (420 Rad)  
CoolingCoolingCoolingCooling
XSPC Chrome Compression Fittings EK RES X3 150 Primochill PremoFlex Advanced LRT Clear 1/2 ID EK-FC (R9 290X) 
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EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
MonitorKeyboardPowerCase
BenQ XR3501 35" Curved Corsair Vengeance K90 Seasonic X-1250 Gold (v2) Corsair 900D 
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Logitech G400s Senn HD 598 
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X79-GCN
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CPUMotherboardGraphicsRAM
Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 AMD R9-290X GEil Evo Potenza DDR3 2400MHz CL10 (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 120GB EK Supremacy (CPU) NF F12's P/P (360 Rad)  NF A14's (420 Rad)  
CoolingCoolingCoolingCooling
XSPC Chrome Compression Fittings EK RES X3 150 Primochill PremoFlex Advanced LRT Clear 1/2 ID EK-FC (R9 290X) 
CoolingCoolingCoolingOS
EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
MonitorKeyboardPowerCase
BenQ XR3501 35" Curved Corsair Vengeance K90 Seasonic X-1250 Gold (v2) Corsair 900D 
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post #3 of 62
Thread Starter 
Great response, thanks.

Just to be clear, when setting the Ram ratio, I need to try to get it as close to 1600 as possible, without going over it right?
post #4 of 62
Do mind, 6 sticks of Ram are going to need a higher QPI voltage.
Personally I don't mind stress temperatures up to 80c (LinX). But the lower, the better.

I'd start off with the RAM as low as possible so you know it's not a factor for your CPU overclock. When you're sure your CPU overclock is stable, you can take the memory a bit higher.
So sexy it Hz
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[i7 920 D0] [Asus P6T Deluxe V2] [EVGA GTX 1070 SC Gaming ACX 3.0] [12Gb PC3-16000 Kingston HyperX T1] 
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So sexy it Hz
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Hard DriveMonitorPowerCase
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post #5 of 62
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SB-E 3930K @ 4.5GHz & 1.36v Rampage IV Formula R9 290 OC CF DDR3 1866 Dominator Platinum 4 x 4GB (9-11-9-27... 
Hard DriveCoolingMonitorKeyboard
2 x 128GB SSD + 2 x 500GB + 1 x 1TB Heatkiller rev. 3, EK motherboard VRM, Aquacomp... Catleap Q270 27" 2560 x 1440 @ 65Hz Ducky Mini (Snake) 
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post #6 of 62
You should check what stepping your 920 is, I have a d0 stepped i7 920, however it needs similar voltage of a c0 to reach higher clocks. Even with watercooling I only have it at 3.6 at 1.30v (had it at 3.8, put required 1.38v, which was not worth the extra heat imo). I have not tried to get to 4v as I havnt had the need to (and I dont want to over volt it too much, want this chip to last as I find it still going strong biggrin.gif)
If you also know ure batch number (can check on the retail box, if you have it or on the face of the CPU), you can find out what others have achieved with the same batch number (if people have recorded it down).

Good Luck!!
My System
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Intel i7 920 d0 Gigabyte EX-58 UD4P Gainward GTX 570 GS Gskill nq 6gb @ 1600mhz 
Hard DriveOptical DriveCoolingOS
500gb Seagate Barracuda 12, 1.5TB Samsung Silent LG Super Multi Water Cooling Windows 7 64bit Home Premium 
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Samsung BX2240 Steelseries 7G Thermaltake EVO Blue 750w Corsair 700d 
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My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 920 d0 Gigabyte EX-58 UD4P Gainward GTX 570 GS Gskill nq 6gb @ 1600mhz 
Hard DriveOptical DriveCoolingOS
500gb Seagate Barracuda 12, 1.5TB Samsung Silent LG Super Multi Water Cooling Windows 7 64bit Home Premium 
MonitorKeyboardPowerCase
Samsung BX2240 Steelseries 7G Thermaltake EVO Blue 750w Corsair 700d 
MouseMouse Pad
Logitech G700 Razer Goliathus 
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post #7 of 62
Thread Starter 
You totally lost me with d0 and c0 biggrin.gif
The batch number off the box reads 3839A522

3.6 is probably what I will go for, that will be a pretty good increase from stock right?
post #8 of 62
Yea its a very noticable increase. c0, d0 refers to the stepping of the CPU. Earlier i7 920's that were released had c0 stepping while later models (more refined I believe) had d0 stepping and typically can overclock higher or use less voltage to achieve the same OC as the c0.

It actually might be called revision, instead of stepping.... (thought I always saw people refer to it as stepping, however in CPUZ it is under revision).
So, if you want to check get a program called CPUZ, on the first tab (main tab) on the right hand side on the middle it should say "Revision" and either "C0 or D0" next to it.

I didnt find ure exact batch number but found one similar (3839A556) which acheived 3.8ghz at 1.34v, so it is possible that you will expect similar results.. however it is also possible that you will get something completely different biggrin.gif

Read alot of guides, last thing you want to do is destroy a trusty i7 from doing something incorrect.
My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 920 d0 Gigabyte EX-58 UD4P Gainward GTX 570 GS Gskill nq 6gb @ 1600mhz 
Hard DriveOptical DriveCoolingOS
500gb Seagate Barracuda 12, 1.5TB Samsung Silent LG Super Multi Water Cooling Windows 7 64bit Home Premium 
MonitorKeyboardPowerCase
Samsung BX2240 Steelseries 7G Thermaltake EVO Blue 750w Corsair 700d 
MouseMouse Pad
Logitech G700 Razer Goliathus 
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My System
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 920 d0 Gigabyte EX-58 UD4P Gainward GTX 570 GS Gskill nq 6gb @ 1600mhz 
Hard DriveOptical DriveCoolingOS
500gb Seagate Barracuda 12, 1.5TB Samsung Silent LG Super Multi Water Cooling Windows 7 64bit Home Premium 
MonitorKeyboardPowerCase
Samsung BX2240 Steelseries 7G Thermaltake EVO Blue 750w Corsair 700d 
MouseMouse Pad
Logitech G700 Razer Goliathus 
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post #9 of 62
Thread Starter 
ok got it, its c0/c1
post #10 of 62
Thread Starter 
400
Edited by Katchin - 2/19/12 at 4:34am
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