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Core i5 750, XMP and overclocking

post #1 of 18
Thread Starter 
Hi! i'm new here...and i've been looking for a place where i could find my answers and help to overclock my Core i5 750, as i don't have a clue how to properly overclock while not overdoing it (i can't afford to blow up this CPU! but i still want to improve performance to a certain acceptable limit)

For specs, check my signature.

I bought those G.Skill DDR3-1600 RAM sticks, and the tech guy told me to enabled the XMP profile on them, so i did that, and everything seem to be fine.

Months later, i opened up CPU-Z and then CoreTemp, and discovered that Turbo Boost doesn't kick in even if i force a software to use 2 cores only (using affinity in tasks manager). So then i checked on some boards and Turbo Boost is disabled when you use other options in your BIOS, such as XMP profile.

My CPU bus speed is up to 160 and Core Multiplier from 16x (stock) to 17x from the XMP Profile. The maximum Multiplier on this board in 21x.

Some peoples told me it's safe to increase the Multiplier without the computer being unstable or freezing/crashing/unable to boot, is that true? I'm asking because i tried increasing the Core Multiplier on my older Athlon 64 3700+ 2.2Ghz (S939, San Diego core) to a higher spec than the "AI overclock" spec, and it just froze to a point where i had to reset the CMOS with the jumper inside in order to make it work again.

I've read a lot about the Core i5 750 being able to be greatly overclocked and still being stable...but i need to know, is that safe for me to increase the Multiplier up to 21x? What else could i do to increase its speed without going overboard? Keep in mind i use air cooling, and i think my CPU and general computer cooling is pretty good (again check my signature).

As for the OS, i use Windows 7 Home Premium 64-bit. and my Asus P7P55D-E LX use the latest BIOS update (1602 as i posted this).

thanks a lot for helping me.
Edited by RaptorZX3 - 2/19/11 at 12:51pm
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post #2 of 18
Thread Starter 
i don't have many friends who can help me with overclocking and they're all way too busy these days. So i hope someone will be able to help here.
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post #3 of 18
Hi there.

From what I can make out, you are using the automatic oc options in your bios ?

Stop doing that.
First off, for Turboboost to kick in, c-state needs to be enabled, and the cpu multiplier needs to be set to auto.
That way, in normal mode the multi will jump up from 9x to 21x, and when TB kicks in it will jump up to x24.
Best to also turn on speedstep. Do NOT turn on C1E, that's bad news when oc'ing.

To get the best result with TB on, try these settings :

Ai Overclock Tuner : MANUAL
OC From CPU Level Up : AUTO
CPU Ratio Setting : AUTO
Speedstep : Enabled
Turbomode Tech : Enabled
Xtreme Phase Full Power Mode : Enabled
BCLK : 160
PCIE : 100
DRAM Freq : <set this below rated speed untill you reach a stable oc.this to rule out mem instability when oc'ing the cpu>
QPI Frequency : <set this at highest setting>

OC Tuner : Turbo Profile

CPU Differential : Auto
CPU Clock Skew : AUTO

CPU Voltage Mode : Offset
Offset Voltage : 0.12500
Offset Sign : [+]
Current CPU Core Voltage : make sure the reading is around 1.300V

Quote:
The offset is a little tricky.set it to the above setting, then reboot and go right back into bios, and check the reading. if the readout is higher than 1.300V, lower the offset a bit. If the readout is lower than 1.300V, then set the offset a bit higher. Then reboot and go right back into bios and check the cpu voltage readout again. Keep doing that untill you have it at 1.300V -ish...
IMC Voltage : 1.27 (maybe you can lower this afterwards)
DRAM Voltage : stock voltage, because you are downclocking it for now
CPU PLL : 1.80 (lowest setting)
PCH Voltage : Auto

DRAM DATA REF : Auto
DRAM CTRL REF : Auto
DRAM DATA REF : Auto
DRAM CTRL REF : Auto

Load-line Calibration : Enabled
CPU Spread Spectrum : DISABLED
PCIE Spread Spectrum : DISABLED


As for CPU settings in the next tab,
Disable everything except Speedstep Technology, Turboboost, c-state and thermal control.

Keep USB legacy support DISABLED when oc'ing. It could help stability.


Try to do some testing with these settings, use Prime95, Coretemp and CPU-Z to monitor stability, voltages, temps and changes in multiplier.

First let prime run on all four cores and check if speedstep kicks in upto x21.
Then run it on only ONE core and check if TB kicks in and the multi jumps to x24. MONITOR YOUR VOLTAGE AND TEMPS VERY CAREFULLY, as you are using an offset from default voltage, and it may vary a little from bios readings. If too high, lower the offset a bit in bios untill it sits just right.

If these settings are stable for you on one core AND all cores (test them both at least 6hrs in prime), then you can tweak the offset voltage to the lowest stable setting, or up the BCLK if your temps allow it.

Hope this will help a bit. I have allmost the same setup, and it also took me a while to understand how to implement TurboBoost into my OC...

Have fun

Oh, and BTW, yes, TB don't work with XMP profile. It's either that or Turboboost. You could leave XMP profile on and disable TB. FYI, I have speedstep enabled but both TB and XMP disabled. Instead I oc'ed it to 4.0ghz and also tightended my memory settings. I have BCLK190 x 21 multi, so with speedstep on and cpu voltage at offset setting, it ranges from 190x9 at 1.056V upto 190x21 at 1.320V, so no need really for TB...
Edited by genuine555 - 2/19/11 at 3:55pm
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post #4 of 18
Thread Starter 
with the settings i have right now, can i just put the core multiplier up to 21x and still being safe and perfectly stable?
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post #5 of 18
Quote:
Originally Posted by RaptorZX3 View Post
with the settings i have right now, can i just put the core multiplier up to 21x and still being safe and perfectly stable?
You'd probably be stable, but voltages and temps would skyrocket when those other settings are kept on auto. The settings I presented will acheive the same, but SAFE.
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post #6 of 18
Quote:
Originally Posted by genuine555 View Post
You could leave XMP profile on and disable TB. FYI, I have speedstep enabled but both TB and XMP disabled. Instead I oc'ed it to 4.0ghz and also tightended my memory settings. I have BCLK190 x 21 multi, so with speedstep on and cpu voltage at offset setting, it ranges from 190x9 at 1.056V upto 190x21 at 1.320V, so no need really for TB...
I'd recommend this also, you have a fairly hefty CPU cooler (though your case airflow isn't huge) so I imagine you will manage fine on temps up to about 1.3v.

If you're willing to take your time and up the OC gradually I think you could manage a 3.8 - 4GHz OC.

Also, for working out a stable overclock most people tend to leave speedstep off and then turn it back on once you have an OC you're happy with (and then do some stability testing). I had a few issues with it when I had LLC disabled. Voltages weren't keeping up with the frequency changes...


Just saw this:

Quote:
Originally Posted by genuine555 View Post
QPI Frequency : <set this at highest setting>
You meant to say lowest right? : /
Edited by Crabid - 2/19/11 at 5:20pm
    
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post #7 of 18
Quote:
Originally Posted by Crabid View Post



You meant to say lowest right? : /
Nope, HIGHEST

Take this thread as an example :

http://www.overclock.net/intel-mothe...-i5-760-a.html

Quick Path Interconnect Frequency for i5 is locked to x32 or x36. Leave it at x36.
UNLESS he's aiming for a HIGH BCLK, then best to set at lowest, cause it WILL hold back for a high BCLK. But that won't be the case here,so...
Edited by genuine555 - 2/19/11 at 5:34pm
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post #8 of 18
Quote:
Originally Posted by genuine555 View Post
Nope, HIGHEST

Take this thread as an example :

http://www.overclock.net/intel-mothe...-i5-760-a.html

Quick Path Interconnect Frequency for i5 is locked to x32 or x36. Leave it at x36.
UNLESS he's aiming for a HIGH BCLK, then best to set at lowest, cause it WILL hold back for a high BCLK. But that won't be the case here,so...
ahh, ofc, still at 160 bclk
    
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post #9 of 18
Quote:
Originally Posted by Crabid View Post
ahh, ofc, still at 160 bclk
I'm pushing 200-210 BCLK right now, trying for 4.2ghz
So now I've set QPI at lowest, cause otherwise it would hold back on stability.
I'm on the edge on air though, 1.41V vcore and temps around 75-80c in prime blend test :S
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post #10 of 18
Thread Starter 
well i still want to keep my RAM at their spec speed, which is DDR3-1600.

I'm a little confused...XMP does disable TB.
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