Any suggestions for improving 4.8Ghz system?

RFS001

RFS001

RFS001

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8 Apr 2013
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3
Hi 8 Pack and all.

Firstly I would like to say congratulations on a great show at the weekend.

Secondly I have been reading all the threads from the beginning and will continue to do so but I just wanted to check I have been understanding things right so far. My pc is in my signature. I am currently running @ 4.8Ghz and have been so for a while with the following Bios settings, I am looking for a 24/7 overclock , not a benchmark.

Bios reads as:

BCLK/PCIE Frequency 100.0
Turbo Ratio - 48 on every core.
Internal PLL Volatge - Auto
Memory frequency 1600MHz
Memory Bandwidth Booster - Disabled
Xtreme Tweaking Disabled
iGPU Max. Frequency - Auto

CPU Manual Voltage set to 1.38V reads 1.396V in the bios
DRAM Voltage set to 1.5V reads 1.495V in bios.

All other voltages are set to Auto

VCore PWM mode is set to Extreme
and VCore LLC is set @ 75% (suitable for 4.8-5.2Ghz)
Vcore Switching Frequency mode - Manual
VRM fixed frequency mode - 350
Vcore phase control - Extreme

Currently I believe from my reading that I should not be using these Extreme settings as I will be reducing the lifespan of the cpu, but how much by? Can I use any other setting to help stablise the system instead of Vcore? I would really like to keep the cpu speed high as the program I use is very cpu bound and still hits 100%.

Also should I be disabling the CPU C1E, C3 Report, C6 Report and CPU Spread Spectrum, all currently set to Auto. How will this benefit me if any?

Thanks for all your initial thoughts.
 
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I enjoyed doing those LN2 Demo and meeting so many from the Forums. Glade you enjoyed the show.

Firstly the extreme settings you are using are only for power delivery so will not be reducing the CPU's life if you stay within decent volts and temps.

Yes there are other volttages that certainly help to stabalise a cpu other than Vcore. Although 1.45v and below is acceptable with your cooling on SB so you do have headroomn on the Vcore too.

If I was you I would enable PLL Overvolting. Then try tuning PLL some CPU like it very low 1.45-1.55 or some like it up at 1.9-1.95 try these out.

You can also use VCCIO which is IMC volts to help stabalise a clock and VCCSA also. Tune VCCIO between 1.05 and 1.15 on SB.

Without adding Vcoire you could also add more LLC if need be.

As far as CPU features go Disable C States and Spread Spectrums but leave S[eed step on. Also give your RAM a slight Voltage bump to give more tolerance for overclocking.
 
Thank you for you response. I shall have a play around with them. The main reason that I did not want to increase the Vcore is because I thought 1.4V was my limit and with the LLC set as it is at the moment then I am hitting 1.39V @Idle in Cpuz(from my memory - I will have to check). But if adding more Vcore is not a problem them I am happy.

Also from the little stress testing I have done, I have seen core temps in the mid 70's once it gets into the 8k iterations. I just wanted to make sure that I wasn't pushing anything too hard.

As for the RAM from reading on here, am I right in thinking that

a) you don't rate it very highly for overclocking
b) that even though it is rated @ 1.5V I should be ok to push it up to anywhere around 1.65V.

Thanks again and I am glad you enjoy what you do.
 
I would say you want to stay about 20 degrees below the maximum temperature which I think is 105 degrees for the Sandy same as the Ivybridge so I would say max temperatures 85 should be fine as it is a solder joint with the cpu lid. Unlike Ivy which is thermal paste... you run the risk of melting the paste and it bleeding onto the PCB from the die :-(
 
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