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i5 760 - My first 4.0Ghz

post #1 of 22
Thread Starter 
I'm so excited to finally push my first gen i5 to 4.0 Ghz tonight. The first time I tried overclocking it I could only get it up to 3.6 Ghz, and that's how it was for months until I decided to push it a little further.

I did some reading and learned to manage the voltages a little more and was able to push it to 4.0 Ghz without the computer failing to start. Right this moment it's still running in Prime95 (Large FFTs) . I'm going to leave it for 24 hours and hope that it's stable. The highest temperature so far is 76 C. I think that's pretty good biggrin.gif

Just a quick question. The RAM I have has a stock speed of 1333Mhz. In the BIOS I set it for 1528Mhz (which is also what CPU-Z is saying). But Windows 8's task manager is telling me that my RAM is at 1066Mhz. So I'm a little confused about that.

Anyway I'm extremely happy I was able to push my little buddy to 4.0. I'm hoping this will mean a big boost in performance.
post #2 of 22
Thread Starter 
So almost an hour after running Prime95 the first core failed, but the other 3 kept going.
I've also experienced 2 system freezes.

What I've done to try and make it more stable is lowering the RAM speed from 1500Mhz to 1200, and I've increased the Vcore from 1.38v to 1.4.
I'm hoping this will make it a little more stable.
post #3 of 22
You can increase your RAM back to 1500MHz, but you need to increase the RAM's volt.It was made for 1333MHz, but a little extra juice can get it higher than what you want. If OCing your first gen i5 is like OCing my new chip, then I guess I'll have to report back to you when I get around to OCing my rig a little further, including RAM.

EDIT: I don't know if you have it, but you may need to increase the QPI/VTT volt.
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post #4 of 22
Thread Starter 
Is QPI/VTT the same as IMC? If so then I have that at 1.2. It won't go any higher than that I'm afraid.
I've increased the DRAM voltage from to 1.5 to 1.6 1.7 1.8 and bumped the speed to 1600 Mhz.

PLL is at 1.85, PCH is at 1.10, LLC is enabled and the C-states as well as Speed-step are disabled.

Also if it matters, I've got the CPU set to 200x20. I've read that a Ratio Setting of x21 is unstable.
Edited by brootalperry - 5/20/14 at 7:04pm
post #5 of 22
here was my 4.0 configuration with an I5-760


4.0

Memory Cofigure

DRAM SPD.............[Standard]
DRAM Frequency......................................... ....[2:8]
timings set to your own RAM's spec, mine are 7-9-7-24-1T

Memory Low Gap .................[AUTO]
Memory Remap Feature.........[Enabled]
Memory Hole.......................[Disabled]
DRAM Margin Ranks..............[Disabled]

CPU Configuration

Hardware Prefetcher......................[Enabled]
Adjacent Cache Line Prefetch..........[Enabled]
MPS and ACPI MADT ordering..........[modern ordering]
Max CPUID Value Limit..................[Disabled]
Intel Virtualization Tech................[Disabled]
Execute-Disable Bit Capabili..........[Enabled]
Active Processore Cores................[ALL]
A20M.........................................[Disabled]

C1E Support...............................[Disabled]
Intel SpeedStep Tech..................[Disabled]
Intel C-STATE tech ....................[Disabled]

Frequency/Voltage Control

Dummy O.C.........................[Disabled]
CPU Multiplier Setting ..........[21]
CPU Skew Control.................[0ps]
Clockgen Switch Mode...........[Disable]
CPU Frequency Setting..........[191]
PCIE Frequency Setting.........[100]
QPI Frequency Selection........[Auto]
MCH Strap...........................[DRAM Ratio]

Extreme Cooling..................[Disable]
EVGA VDroop Control...........[With VDroop]
Bootup CPU VCore...............[1.18750V]
Eventual CPU VCore.............[1.18750V]
DIMM Voltage.....................[1.64]
Bootup CPU VTT..................[1.275]
Eventual CPU VTT................[1.275]
PCH...................................[1.050V]
CPU PLL.............................[1.800V]

DIMM 1DIMM 1/2 DQ Vref..............[+.0mV]
DIMM 1DIMM 3/4 DQ Vref..............[+.0mV]
DIMM 1DIMM 1/2 CA Vref..............[+.0mV]
DIMM 1DIMM 3/4 CA Vref..............[+.0mV]

CPU PWM Frequency....................[477 KHz]
VTT PWM Frequency....................[240 KHz]
DDR PWM Frequency...................[240KHz]
CPU Signal 1..............................[auto]
CPU Signal 3..............................[auto]
CPU Signal 4..............................[auto]
CPU PCIE 1................................[Auto]
CPU PCIE 2................................[Auto]
DDR Signal 1..............................[Auto]
DDR Signal 2..............................[Auto]
DDR Signal 3..............................[Auto]
DMI Signal.................................[Auto]
PCH Signal.................................[Auto]
post #6 of 22
Thread Starter 
Thanks for the settings, but I don't think I have most of those settings in my BIOS.
Anyway I tried playing Planetside 2 and the computer has crashed on me 3 times now. It's getting a bit hard to make this thing stable at 4.0
post #7 of 22
Thread Starter 
I think the problem I'm having is that I can't get my VTT/IMC voltage past 1.20. My motherboard simply won't let me.
I've increased everything from the vcore to the DRAM voltage, and i've decreased RAM speed, tinkered with C-states and LLC.

It's just not stable. Could it simply be because my VTT is not high enough? I've seen some guides with a VTT of 1.3-1.4. But I can only go up to 1.2.
Does this mean that I'll have to settle for 3.8 Ghz?
post #8 of 22
SO my understaing on the IMC/VTT is the voltage for the integrated memory controller ( IMC ) so if you can increase your BCLK ( base clock speed ) the IMC Frequency also increse
post #9 of 22
I think i needed higher VTT for higher base clocks and ~4ghz is supposed to be easier with higher Bclk.

I also tried 40x with ~167x24 but you might not be able to do that depending on board.

If you can't raise VTT, just check what base clock you can do (even if you use like 15x multi so 150mhz base clock = 2.25ghz and 200mhz base clock = 3ghz, eventually it'll start crashing as you raise base clock) and then go from there

That's just from my experience with an i7 950 some years ago, so apologies if anything wrong or only applicable to lga1366
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post #10 of 22
Thread Starter 
Yep, I realized the source of my problem. This board won't allow me to go any higher than 1.2 for the VTT. So when I'm using a Base Clock of 200, there's not enough power going to the CPU, and so it's unstable. The only other value other than 1.2 is Auto, but I think the board caps out at 1.2 regardless.

At this point it would be better for me to get a brand new CPU/Mobo instead of trying to find a P55 this late into the game, but I don't have the $400 for a 3570K and a compatible board. So for now I'll have to make do with what I can.

Anyway, because the multiplier is limited on the first gen i series, the highest I can go is x22. I'm not sure if that's exactly stable... but 180x22 would give me 3960Mhz which is pretty close to 4Ghz.
What do you guys think?

I've also tried 190x21 which seems a little stable, but I haven't done any extensive tests.
The problem is, I don't exactly know how much power the i5 760 needs at 190-191 BCLK. I guess I'll just have to continue to experiment.
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