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Guide to Overclocking the Core I7 920 or 930 to 4.0ghz - Page 148

post #1471 of 1477
My dad asked me to overclock his old 920. Currently stopped at 3.95 at 1.245 volts. Will wait a few weeks for the weather to warm up and see what the temps will be to decide if I have a bit of room to go 4.1 or not.
Something that is bothering me is the LLC. I've searched the net but haven't found a definitive answer to whether it can hurt the CPU or not with the voltage spikes. I would prefer to not damage it and let it live at least a few years more. Any advice?
Without LLC I would have to bump the voltage up to 1.3, and with the voltage not downscaling on idle I would prefer to not have it sit always at 1.3.
Edited by Akusho - 5/1/17 at 1:34am
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post #1472 of 1477
Quote:
Originally Posted by Akusho View Post

My dad asked me to overclock his old 920. Currently stopped at 3.95 at 1.245 volts. Will wait a few weeks for the weather to warm up and see what the temps will be to decide if I have a bit of room to go 4.1 or not.
Something that is bothering me is the LLC. I've searched the net but haven't found a definitive answer to whether it can hurt the CPU or not with the voltage spikes. I would prefer to not damage it and let it live at least a few years more. Any advice?
Without LLC I would have to bump the voltage up to 1.3, and with the voltage not downscaling on idle I would prefer to not have it sit always at 1.3.

I've had LLC enabled on my i7 920 @ 3.8-4.0 GHz 24/7 since 2009. Use this PC for 3D games and compiling stuff pretty regularly. Just my two cents.
post #1473 of 1477
I was thinking about overclocking my Intel i7 920 D0 Stepping CPU that I purchased back in 2009: http://ark.intel.com/products/37147/Intel-Core-i7-920-Processor-8M-Cache-2_66-GHz-4_80-GTs-Intel-QPI

At 2.793 Ghz (multiplier increased to 21x and Turbo Boost disabled, everything else on Auto) I get these temperature results in AIDA64 while using Prime95's Small FFT stress test: (20 minutes) http://imgur.com/eVelXwp Edit: It's been an hour and 50 minutes with Prime95 now and the hottest CPU Core is holding at 65 degrees celcius and "CPU" (what does this variable refer to?) is holding at 56 degrees celcius. Edit: http://imgur.com/MqxGzPK (2 hours 10 minutes)

Should I be worried about these results before even beginning to consider overclocking? I am using a Noctua DH14 Heatsink, are these temperatures in line with using this heatsink? If they aren't then maybe I applied the thermal paste improperly or the heatsink isn't applied as firmly against the CPU as it should be.

I've been reading this guide on overclocking the CPU and am currently just monitoring temperatures before doing anything drastic. I'm pretty unfamiliar with modern overclocking but can understand the guide in the original post, It was a lot easier when you just had a FSB and Multiplier to adjust smile.gif

If the temperatures are good, what are some good suggested voltages for achieving an overclock of say, 3.2 to 3.4Ghz? The guide provides values for achieving a 4Ghz overclock but I don't want to be quite that risky with my hardware.

Thank you,

Edit: "What are safe voltages?" should be updated to mention the 1.275v VCore value for D0 Stepping CPU's.
Edit: Modern Prime95 versions don't seem to let you specify more Threads than there are CPU Cores. In the case of the 920 and 940 CPU that would be 8 threads max (not 10!).
Edited by Nicholas Steel - 8/18/17 at 5:24am
post #1474 of 1477
I've taken the plunge and have configured my BIOS with the following settings:

Vcore: 1.2750v (Guide says 1.2750v for D0 Stepping CPU)
qpi/uncore (VTT): 1.35v
PLL: 1.88v
Vdimm: 1.50v (I am using 1.50v RAM so I see no reason to increase it to 1.65v)
IOH: 1.2v
ICH: 1.2v
Command Rate: 2

CPU Multiplier: 19 (3.42Ghz)
Base Clock: 190Mhz
RAM Multiplier: Lowest Available Option
UnCore Multiplier: Lowest Available Option
QPI Quickpath Interconnect Multiplier: Lowest available Option
RAM Timings: Auto
Load Line Calibration: Enabled
Both Spread Spectrum Settings: Disabled
Hyperthreading: Disabled (reduces heat)

I performed Prime 95's Small FFT stress test on 8 (hyperthreaded) Cores while watching Youtube for 33 minutes and encountered no issues. The CPU didn't exceed 64 degrees celcius (TJMax=67.9 celcius) each time I stopped to look at it for 30 seconds and each CPU Core never exceeded 71 degrees celcius (80 degrees and higher is bad and 90 degrees and higher is dangerous/stupidly hot I think?). I will of course need to do an overnight stress test to be confident that this setup is stable.

My previous attempt at overclocking involved leaving all the voltages and various settings set to "Auto" and was a really poor attempt at overclocking in hindsight (it resulted in blue screens occurring every so often and on other occasions, rebooting without warning).

Intel i7 920 D0 Stepping
ASUS P6T
24GB DDR3 RAM
Geforce 760 4GB
Edited by Nicholas Steel - 9/10/17 at 5:29am
post #1475 of 1477
I went with a 19x multiplier and Hyperthreading disabled. I have to say, I literally experience no performance increase in:

- DOOM (2016) (must lower resolution to improve FPS to 60 when smoke is on screen/looking through glass)
- The Witcher 3 (720p resolution improves FPS but its still too low most of the time to be enjoyable, & 720p sucks)
- Dark Souls 3 (Upgrading from a 560Ti to the 760 allows me to play 60FPS at 1600x900 instead of 50+FPS at 720p)
- Guild Wars 2
- Lords of the Fallen
- The Surge (same places and camera angles still result in FPS loss. Lowering resolution or resolution scaling greatly helps FPS while greatly lowering visual fidelity)
- Dragon Age: Inquisition
etc.

Which proves a Geforce 760 4GB video card is the limiting factor and not the CPU.

Edit: my friend has the same CPU and Motherboard as me and they recently upgraded to a Geforce 960 4GB video card. They can achieve notably improved frame rates at 1920x1080 than I can in many of these games (especially The Witcher 3).
Edited by Nicholas Steel - 9/10/17 at 5:35am
post #1476 of 1477
With my system i can manage to get 3.10Ghz Fix, without issue. If i do 3.5, or 3.6 the system not boot. It's maybe my system can't handle more, or i just mess up something with the settings.
post #1477 of 1477
Take photos of all the voltage & clock speed BIOS settings on your motherboard.
Edited by Nicholas Steel - 9/20/17 at 4:53am
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