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Aiming for 4.51 Mhz at least, need advice.

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October 2, 2010 12:50:22 AM

Hello, I currently got in head to OC my I7-930 to 4.51 ghz, but changing the CPU voltage is just not enough, so i'm seeking advice from you guys.

My build is:
I7-930 (Watercooled)
ASUS P6T58X Premium
G. Skill ram 1.5v 7-8-7-24-2N (Stock)
2x ATI 5970
__________

CPU Ratio Setting - [21.0]
C1E Support - [Enabled]
Hardware Prefetcher - [Enabled]
Adjacent Cache Line Prefetcher - [Enabled]
Intel Virtualization Tech - [Enabled]
CPU TM Function - [Enabled]
Execute Disabled Bit - [Enabled]
Intel HT Technology - [Enabled]
Active Processor Cores - [All]
A20M - [disabled]
Intel Speedstep Tech - [Enabled]
Intel C-STATE Tech - [Disabled]

BCLK Frequency - [215]
PCIE Fequency - [100]
DRAM Frequency - [Auto]
UCLK Frequency - [Auto]
QPI Link Data Rate - [7550's mt/s] (Want that OC'ed somehow, think i need to tweak the QPI/DRAM Core Voltage, there is a dangerous limit there, which i don't know what is)

Dram Timing Control:

1st Information - 7-8-7-24
2nd Information - 2N



Load-Line Calibration - [Disabled]
CPU Differential Amplitude - [Auto]


CPU Voltage - [1.45000]
CPU PLL Voltage - [1.88]
QPI-Dram Voltage - [Auto]

IOH Voltage - [Auto]
IOH PCIE Voltage - [Auto]
ICH Voltage- [Auto]
ICH PCIE voltage - [Auto]


DRAM Bus Voltage - [1.64]
DRAM REF Voltage - [Auto]

CPU Spread Spectrum - [Disabled]
PCIE Spectrum - [Auto]
CPU Clock Skew -[Auto]
IOH Clock Skew - [Auto]

Given up trying to find something that will explain, its just confusing and I never get that straight answers I'm looking for.

Questions:
-What would/could make my CPU more stable?

-CPU PLL: Purpose and limit?

-QPI/DRAM Core Voltage: Purpose and Limit?

Any advice and answers would be much appreciated.

More about : aiming mhz advice

a b à CPUs
a b K Overclocking
October 2, 2010 3:44:58 AM

Disable C1E and Speedstep. They can be turned back on once you have a stable OC.
Enable load-line calibration.
QPI is like the fsb. 1.4v is the safe max, try to stay around 1.3-1.35v
Simply put PLL voltage helps keep the cpu frequencies from oscillating under load so if the frequency is jumping even a few mhz then upping the PLL voltage can help stabilize it but to much can actualy make it unstable.

Try 1.35v QPI
and try to set PLL only a few notches up from the original setting before you turned it up, or just set it to auto.

"think i need to tweak the QPI/DRAM Core Voltage, there is a dangerous limit there, which i don't know what is"

The voltage difference between the QPI and ram voltage should be less than .5v.
a b å Intel
a c 172 à CPUs
a c 197 K Overclocking
October 2, 2010 4:08:35 AM

As always, with overclocking, YMMV.

Your chip may be incapable of running that fast.
Related resources
a b à CPUs
a b K Overclocking
October 2, 2010 4:11:06 AM

^Very true
October 2, 2010 4:38:39 AM

4.5ghz isnt a simple clock bump and voltage adjustment.

If you have given up trying to find something to explain then you need to also give up on overclocking to that speed.

If you dont understand what you are setting/adjusting your chances of damaging your system are extremely high at those frequencies.

3 suggestions that you would be wise to think about,

1. Anyone willing to offer settings and advice to punch out those speeds I wouldnt trust to replace my cmos battery let alone o/c my rig. You will find that the people that have O/C'd to high speeds wont be here telling you how to do it for very good reasons.

2. Numbers look great and all but to be honest you will get the biggest increase and the most useful power out of your chip with a 600-800mhz bump
Its easy, it will be 24/7 stable and in a lot of cases will outperform a massive O/C 8 times out of ten depending on application. Here im talking about real world applications not so called "Benchmarking".

3.Its not all about the processor, spend time tuning, ram timings,dividers,fsb frequency,latency. All have there part to play, when you get it right it will fly.
You can spend months changing tweaking to chase that sweet spot.
a b à CPUs
a b K Overclocking
October 2, 2010 5:01:56 AM

^Also true
It is one thing to point you in the right direction but when it comes to those frequencies the voltage levels can get high and beyond the safe max, and nobody is going to help someone cook a Rig.
Like tonkatuffmofo said "Numbers look great and all but to be honest you will get the biggest increase and the most useful power out of your chip with a 600-800mhz bump Its easy, it will be 24/7 stable and in a lot of cases will outperform a massive O/C 8 times out of ten."
I would set it up to run at 3.8-4ghz and leave it alone.
I have done some big overclocks and in the end it wasnt worth it, I ended up cooking 2 790I boards in the process just to get a high 3dmark06 score.
Since then I havent done it. Its not worth it.
October 2, 2010 10:00:27 AM

d1rtyju1c3 said:
The voltage difference between the QPI and ram voltage should be less than .5v.


0.5 or 0.05v? As my current DRAM volt is 1.64, and the minimum volt for qpi is 1.2v it wouldnt work
a b à CPUs
a b K Overclocking
October 2, 2010 1:22:58 PM

Even 5GHz would be safe if it did not get too hot and didn't need too much voltage. But, most chips need a heck of a lot of voltage to get over 4-4.5GHz.

Hell, on LN2, I had to give a Pentium D 2.1v to get to 5GHz!
October 2, 2010 1:56:54 PM

about 80 degrees on full load @ 1.45v

Still don't know how long the gap should be between QPI/DRAM core voltage and DRAM Voltage should be, is it 0.5 or 0.05?

It's possible by the way, saw a guy having those clocks, stable and at only 1.45v

http://forums.overclockersclub.com/index.php?s=9521437e...
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a b K Overclocking
October 2, 2010 2:09:22 PM

He's dropped it down already 24/7 to 4.0-4.2 Ghz, I forget the exact OC he has right now, but it's not 4.5 Ghz.

That tells you something right there.
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a b K Overclocking
October 2, 2010 3:09:36 PM

Slipperss said:
0.5 or 0.05v? As my current DRAM volt is 1.64, and the minimum volt for qpi is 1.2v it wouldnt work



.5v
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a b K Overclocking
October 2, 2010 7:43:09 PM

What's the specs on the WCing loop? You may want to add a second 360 rad. In any case, you seem to be hitting the max for that CPU.
!