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Shouldn't my PII 970BE C3 overclock more?

post #1 of 3
Thread Starter 
When I built the system years ago, I toyed with over-clocking. But quit to keep C&Q working, settling on 3.7 GHz. A few months ago, quite by chance, I came across PhenomMsrTweaker and, after optimising my cooling (thanks to the official Cooler Master ATCS 840 owners’ thread) and then reading the various guides, started experimenting....

Using an HTT of 200 MHz, a NB frequency of 2400 MHz and DDR3 at 1600 MHz with 8-9-8-22-31-IT timings, my rock-solid underclock/overclock currently is:

P4: 4x, 0.8375 (CPU VID) and 1.05 V (CPU-NB VID)
P3: 8x, 0.95 and 1.1
P2: 12x, 1.0125 and 1.1
P1: 16x, 1.1500 and 1.1
P0: 18.5x, 1.3125 (down from the auto setting of 1.3750V) and 1.15, with the CPU-NB offset voltage set to 1.175 V.

Increasing the multiplier, 3.8 GHz appeared stable at 1.3375, 3.9 GHz at 1.375 and 4 GHz at 1.4375 V. Running at 4 GHz, the system passed a 20x Intel Burn test at very high—I never use the maximum setting—with a max core temp of 56.9 C, only to later fail Prime95 in a matter of seconds.

Experimenting with the voltage offsets, appears to have worked. Setting the CPU to 1.445 and the CPU-NB to 1.180 V appears to have made the 4 GHz overclock Prime-stable- it’s been almost five hours with no errors and the core temp peaking at 51.1 C.*

* Ambient temperatures vary slightly during the course of the day, but are always below 20 C.

In light of its current low voltage, shouldn’t the NB frequency be able to go considerably higher? Yet every attempt at increasing the multiplier to x13 led to a BIOS recovery request. Do other voltages need to be tweaked (as some review sites do)? Or do the people that get theirs over 2600 MHz do so via HTT-overclocking? I tried the latter, with little success; I fear my noob-ism is showing.

Secondly, how much more can the CPU be pushed? Would a better, QUIETER cooler be worth it (a boo-boo led to the burning out of the CPU fan header)?

When I built the system water-cooling was way too exotic for my slightly risk-averse approach, but the all in one units look promising and, let’s face it, my case is not wanting for lack of space! biggrin.gif

Any advice would be most appreciated. smile.gif
    
CPUMotherboardGraphicsRAM
i7-6700k (currently @ 4.5GHz) Asus Maximus VIII Hero Alpha Asus GTX 970 Strix OC Corsair Vengeance LPX 16GB 3000MHz 
Hard DriveHard DriveHard DriveHard Drive
Intel 750 400GB (AIC) Intel 730 240GB WD Velociraptor 600 GB WD Red 4TB 
Optical DriveCoolingOSMonitor
Generic DVD burner NH-D15 Win8.1 Dell u2715H 
MonitorKeyboardPowerCase
NEC MultiSync FP2141SB (CRT) Logitech G15 & G13 EVGA SuperNova 750W P2 CoolMaster ATCS 840 
MouseAudioOther
Logitech G502 Onboard Klipsch 4.1 
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CPUMotherboardGraphicsRAM
i7-6700k (currently @ 4.5GHz) Asus Maximus VIII Hero Alpha Asus GTX 970 Strix OC Corsair Vengeance LPX 16GB 3000MHz 
Hard DriveHard DriveHard DriveHard Drive
Intel 750 400GB (AIC) Intel 730 240GB WD Velociraptor 600 GB WD Red 4TB 
Optical DriveCoolingOSMonitor
Generic DVD burner NH-D15 Win8.1 Dell u2715H 
MonitorKeyboardPowerCase
NEC MultiSync FP2141SB (CRT) Logitech G15 & G13 EVGA SuperNova 750W P2 CoolMaster ATCS 840 
MouseAudioOther
Logitech G502 Onboard Klipsch 4.1 
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post #2 of 3
The CPU-NB voltage at around 1.2-1.3v will net you somewhere close to the max you're going to find for the NB clock. I used 1.25v for 2800mhz back on my PII 965 just fine. As for cpu clockspeeds go, you wont find much higher than 4.1ghz without pushing high voltage and keeping that chip at ambient or subzero temps. My PII 965 topped out at 4.1ghz 1.55v on a mid-range motherboard. Going colder helps more with clockspeeds than voltage on Phenom II once you reach the extreme speeds.
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CPUMotherboardGraphicsGraphics
AMD FX-8120 Bulldozer 8-core CPU MSI 990FX GD80 v2 ASUS R9-280 Direct CU II ASUS R9-280 Direct CU II 
RAMCoolingOSPower
Kingston 16GB (4 x 4 GB) DDR3-1333 C9 1.5v Phanteks PH-TC14PE Windows 10 Antec True-power Quattro 1200W 
Case
Cooler Master CM Storm Stryker 
CPUMotherboardGraphicsRAM
1045T @4.05Ghz 1.45v [300 FSB] 3000 NB 1.26v MSI 990FXA-GD80 v2 EVGA GTX480 @820mhz Crucial Ballistix sport VLP 2x4GB @ 1333 cas 7 
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Thermaltake Water 2.0 Performer Logitech G710+ OCZ ZT650w CM Storm Stryker 
Mouse
CM Storm Xornet 
CPUMotherboardGraphicsRAM
Phenom II x4 965 @4.1 [2800 cpu-nb] Asus M5A97 R1 AMD 6950 Kingston HyperX 1600mhz 8-9-8-20-21 
Hard DriveCoolingOSMonitor
Too many Thermaltake Water 2.0 Performer Win7 Extreme Edition R1 64bit Acer P224W 22" 1050p 
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Antec BP550 plus Corsair 200R CM Storm Xornet 
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post #3 of 3
Thread Starter 
Thanks for the info, Overkill. I tried 2600 MHz (200x13) at various voltages up to 1.3V this afternoon, but met at first with a few BIOS recovery requests and then nothing, i.e. no POST beep or BIOS recovery request. The fans were spinning, but nothing happened (until the monitors entered power-saving mode); happily the CMOS reset button is on the motherboard’s back panel.

Out of curiosity, I tried the OC genie in the BIOS and it increased the HTT link to 206, resulting in the CPU being slightly over 4.1 GHz and the NB increasing to 2472 MHz. However, the CPU and CPU-NB VDDs stayed the same, while the DRAM voltage increased to 1.651 from auto (1.5) and the NB chipset and NB PCI-E voltages also increased from auto (??) to 1.298 and 1.991, respectively.

Are these voltage changes red herrings? Outside of a few review sites, everything I read said to only increase the CPU and CPU-NB voltages, then again the OC genie overclock booted into Windows with no problem. I never ran any stress tests, owing to uncertainty over the wisdom/safety of the above voltage changes.

Would I even really notice any real-world difference(s) from increasing the NB beyond 2400?
    
CPUMotherboardGraphicsRAM
i7-6700k (currently @ 4.5GHz) Asus Maximus VIII Hero Alpha Asus GTX 970 Strix OC Corsair Vengeance LPX 16GB 3000MHz 
Hard DriveHard DriveHard DriveHard Drive
Intel 750 400GB (AIC) Intel 730 240GB WD Velociraptor 600 GB WD Red 4TB 
Optical DriveCoolingOSMonitor
Generic DVD burner NH-D15 Win8.1 Dell u2715H 
MonitorKeyboardPowerCase
NEC MultiSync FP2141SB (CRT) Logitech G15 & G13 EVGA SuperNova 750W P2 CoolMaster ATCS 840 
MouseAudioOther
Logitech G502 Onboard Klipsch 4.1 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7-6700k (currently @ 4.5GHz) Asus Maximus VIII Hero Alpha Asus GTX 970 Strix OC Corsair Vengeance LPX 16GB 3000MHz 
Hard DriveHard DriveHard DriveHard Drive
Intel 750 400GB (AIC) Intel 730 240GB WD Velociraptor 600 GB WD Red 4TB 
Optical DriveCoolingOSMonitor
Generic DVD burner NH-D15 Win8.1 Dell u2715H 
MonitorKeyboardPowerCase
NEC MultiSync FP2141SB (CRT) Logitech G15 & G13 EVGA SuperNova 750W P2 CoolMaster ATCS 840 
MouseAudioOther
Logitech G502 Onboard Klipsch 4.1 
  hide details  
Reply
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