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i7-870 OC, need help with next step

post #1 of 5
Thread Starter 
So I followed some guides and posts to get to this point:

BLCK: 166
Multi: 24
vCore: 1.352v with 8 thread load ( +0.12500v Offset setting in BIOS)
: 1.360v with 1 thread load
: ~1v @idle
IMC: 1.28v

DRAM: 1.5v (default for my ram)
Ram Freq: 996Mhz (1333Mhz rated)
timings: 11-11-11-24
(I have 2x4GB Mushkin Silverline rated: 1.5v, 1333MHz, 9-9-9-24)

LLC: Enabled
Speedstep: Enabled
C1E: Enabled
Hyperthreading: Enabled
C-States: Limited to C1 only
Turbo: Disabled


Max Temp of any core loading with Linx (8 threads, max memory): 71C

BLCK I have now seems to be the max at these voltages and MULTI, any higher crosses my self imposed limit of 73C. I can say the same for voltages at this BLCK, any higher and cpu is cooking. 170BLCK is like a dead zone but skipping it gives me crazy speeds that aren't even running windows stable and using different multi for higher BLCK in the end doesn't improve final speed much while giving me higher temps.

--------------

So I'm not sure what I should do now, I haven't done a full stability test only 3 runs of Linx in between any changes I was making in BIOS, my ram timings are still loose anyway.

I started the process with high voltages working my way down to the max voltage my cooling could handle, I think now I should keep working that down to find the lowest stable voltages but I don't know how I should go about it.

Do I tighten my RAM timings now and do a full stability test first?

Do I start lowering vCore untill I can't pass 3 runs of Linx, bump a notch up and then start doing longer stability tests? What about IMC, do I lower that first or after?

Please help.
Cheech
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 870 @ 3.8GHz.. HT on P7P55D-E LX MSI N460GTX HAWK 2x4GB Mushkin Silverline 
Hard DriveOptical DriveOSMonitor
640GB and 1TB WD Caviar Black Sony somethingorother Windows 7 x64 23" NEC Multisync EA231WMi 
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Antec Signature 650W Silverstone FT01 
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Cheech
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CPUMotherboardGraphicsRAM
i7 870 @ 3.8GHz.. HT on P7P55D-E LX MSI N460GTX HAWK 2x4GB Mushkin Silverline 
Hard DriveOptical DriveOSMonitor
640GB and 1TB WD Caviar Black Sony somethingorother Windows 7 x64 23" NEC Multisync EA231WMi 
PowerCase
Antec Signature 650W Silverstone FT01 
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post #2 of 5
1)All the power saving features like Speedstep, C1E and C-States disable because if you never disable, the frequency will jump up and down in idling which is bad especially for overclocking.

2)What cooler are you using?

3)If you want to push your BCLK further, lower your multiplier around 20 and set your B-CLK to 200 or more. (Depending which motherboard manufacture you are using.)

4)Set your ram timings to default.

5)If the temperature increases, lower your voltage.

6)At 4ghz, I think is better to leave it alone than playing around the settings. Tweak a bit of voltages to find your sweet spot.
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Western Digital Caviar Black 1TB LG GH-22 Coolermaster Hyper 212 plus Windows 7 Home Premium 64bit 
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post #3 of 5
Thread Starter 
Ok, well I've seen others OC with power saving features on and I'd like to keep them too, is this a safety issue or just stability? I pay for electricity so you know .. I've tried lowering multi and running a higher BLCK but really never got any results that were much better speed wise and I had higher temps so went back to 24 multi.

After that post I tried setting default timings, wow temps went nuts so I loosened them to 10-10-10-24, raising speed to 1320 also didn't do me much good.. so I keep lowering IMC and vCore bit by bit letting it pass Linx 3 times and going lower, got to the point where I can run my ram at 1320 (maybe I should've left it 996MHz and try for default timings instead?). I'll keep doing this untill I can't pass Linx I guess and go from there.

BTW, cooler is Megahalems with 1450rpm gentle typhoons in push pull
Cheech
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 870 @ 3.8GHz.. HT on P7P55D-E LX MSI N460GTX HAWK 2x4GB Mushkin Silverline 
Hard DriveOptical DriveOSMonitor
640GB and 1TB WD Caviar Black Sony somethingorother Windows 7 x64 23" NEC Multisync EA231WMi 
PowerCase
Antec Signature 650W Silverstone FT01 
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Cheech
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 870 @ 3.8GHz.. HT on P7P55D-E LX MSI N460GTX HAWK 2x4GB Mushkin Silverline 
Hard DriveOptical DriveOSMonitor
640GB and 1TB WD Caviar Black Sony somethingorother Windows 7 x64 23" NEC Multisync EA231WMi 
PowerCase
Antec Signature 650W Silverstone FT01 
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post #4 of 5
Thread Starter 
I've lowered IMC to 1.16, less than that it fails Linx on 3rd run.. vCore to 1.28 I think, lower than that Linx crashes instantly. The thing I don't get is that around 1.312 vCore I get lower temps than 1.28v, I thought lowering volts would give me less heat?

A question: Realistically, running ram at 996Mhz is that a lot slower in practice than 1320Mhz? Also if I had a choice to run at 996Mhz and 9-9-9-24 timings and 1320Mhz 10-10-10-24 which should I choose?
Cheech
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 870 @ 3.8GHz.. HT on P7P55D-E LX MSI N460GTX HAWK 2x4GB Mushkin Silverline 
Hard DriveOptical DriveOSMonitor
640GB and 1TB WD Caviar Black Sony somethingorother Windows 7 x64 23" NEC Multisync EA231WMi 
PowerCase
Antec Signature 650W Silverstone FT01 
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Cheech
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 870 @ 3.8GHz.. HT on P7P55D-E LX MSI N460GTX HAWK 2x4GB Mushkin Silverline 
Hard DriveOptical DriveOSMonitor
640GB and 1TB WD Caviar Black Sony somethingorother Windows 7 x64 23" NEC Multisync EA231WMi 
PowerCase
Antec Signature 650W Silverstone FT01 
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post #5 of 5
Ram speed doesn't make a huge difference if you are doing gaming, word processing and web browsing. Generally speaking, faster timing is important. Unless if the program that depends on memory task, than speed, time and capacity will do the talking.

Frankly speaking, if you are conscious about your electricity bill, I suggest you disable the power saving features when you are overclocking. Overclock your cpu when you are playing cpu intensive games like GTA4 or video editing or rendering process or benchmarking.

If you are doing simple web browsing and playing games which doesn't require you to use cpu a lot, like Crysis, NFS Hot pursuit and Mafia 2. Then you should set to default and the power saving features will be enabled.

I don't know what motherboard are you using, but if your motherboard supports a feature that will save your settings, it is a bonus for you because it will save time rather than spending time changing the settings in the BIOS.

By the way, how did you measure your vCore, through BIOS or CPU-Z?
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Intel Core i5 760 Gigabyte P55-UD3P AMD Radeon HD6870 (Sapphire) Kingston Hyper-X 
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Western Digital Caviar Black 1TB LG GH-22 Coolermaster Hyper 212 plus Windows 7 Home Premium 64bit 
MonitorMonitorKeyboardPower
Philips 230E(Main screen) Acer AL1916W(Secondary) Rosewill RK9100 Mechanical CherryMX Blue Keyboard Aerocool E85M-700W 
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Ikonik EN2-WB Logitech MX518 Razer Goliathus AKG GHS 1 
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Gaming rig
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i5 760 Gigabyte P55-UD3P AMD Radeon HD6870 (Sapphire) Kingston Hyper-X 
Hard DriveOptical DriveCoolingOS
Western Digital Caviar Black 1TB LG GH-22 Coolermaster Hyper 212 plus Windows 7 Home Premium 64bit 
MonitorMonitorKeyboardPower
Philips 230E(Main screen) Acer AL1916W(Secondary) Rosewill RK9100 Mechanical CherryMX Blue Keyboard Aerocool E85M-700W 
CaseMouseMouse PadAudio
Ikonik EN2-WB Logitech MX518 Razer Goliathus AKG GHS 1 
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