Overclocking Stuck on i5 750 overclocking, help.

So I got myself EVGA P55 ForTheWin board and brand new i5 750. Being me standard is never enough so I started to clock up. Went to 4GHz no problem (have Corsair H50 on it) and now I'm stuck - every increase I make locks up my computer. Here is how my pc is configured now:

Vcore: 1.425V
CPU PLL: 1.3V



At those setting it's rock solid with temperature never raising above 72 degrees, but do you have any ideas on how can I push it forward?

I mean don't get me wrong, at those speeds it's a monster, but still, wouldn't be myself if I wouldn't try to push it as far as I can.

 

would be better if you posted somthing like this:

Ai Overclock Tuner - Manual
CPU Ratio Setting - Auto
Intel (R) SpeedStep (TM) Tech - Disabled
Intel (R) Turbo Mode Tech - Disabled
BCLK Frequency - 200
PCIE Fequency - 100
DRAM Frequency - DDR3 - 1600MHz

DRAM CAS# Latency - 8 DRAM Clock
DRAM RAS# to CAS# Delay - 8 DRAM Clock
DRAM RAS# PRE Time - 8 DRAM Clock
DRAM RAS# ACT Time - 24 DRAM Clock

CPU Voltage - 1.32500v
CPU PLL Voltage - Auto
QPI/DRAM Core Voltage - 1.25v
IOH Voltage - Auto
IOH PCIE Voltage - Auto
ICH Voltage - Auto
ICH Voltage - Auto

DRAM Bus Voltage - 1.64v
DRAM DATA REF Voltage on CHA - Auto
DRAM CTRL REF Voltage on CHA - Auto
DRAM DATA REF Voltage on CHB - Auto
DRAM CTRL REF Voltage on CHB - Auto
DRAM DATA REF Voltage on CHC - Auto
DRAM CTRL REF Voltage on CHC - Auto

Load-Line Calibration - Enabled
CPU Differential Amplitude - Auto
CPU Clock Skew - Auto
CPU Spread Spectrum - Auto
IOH Clock Skew - Auto
PCIE Spread Spectrum - Auto

Thats from my 4Ghz OC a few weeks back, your BIOS will look different so change it as you see fit, but it just gives us a good idea where you are on the settings you are using. highlight what you changed in red also if you would.

Pro Tip: never go above 1.5coreV unless you have nitrogen at hand.

 

Don't raise the CPU voltage any more. 72 is quite toasty already.

Try the QPI/VTT not the PLL. Over 200MHz may require 1.35-1.4/1.45V depending on the board but very high is not good for the cpu in the long term.

Tbh, isn't 4GHz fast enough?

 

Thanks. I believe 4GHz is enough for everything I do but one thing: Folding. So I'm trying to get as much out of the CPU as I can. I'm getting some sweet points now, but you know how it is, more is always better

Later on today I'll get to BIOS and write down all the specifics and post here. Thanks guys.

PS. I just noticed my fan wasn't running full speed (I have Scythe Gentle Typhoon on my Corsair) so I upped it to 1450RPM and saw a temperature drop to much nicer 68 degrees.

 

want a faster cpu buy one in the end of the day

your pushing that 750 to its max as it is. 4ghz at 1.42v isnt good for the chip long term. I rarely go over 1.3v when overclocking. i always find anything above that and your in danger of damaging the chip.

68c isnt that much better than 72. Id personally drop it down to 3.6ghz and lower the voltages you will notice the performance drop off isnt huge. i930 is the way forward for faster than 4ghz overclocks.

 

I'm puzzled why 72ºC is considered 'toasty'? I'm sure I've read reviews of systems in Custom PC that have temperatures 10-15ºC higher than that without comment.

 

I believe it's the temperature specification listed by intel. I imagine they don't take a spec like that lightly so it's probably 72c for a reason.

 

prime gets my i7 to 80c at 4Ghz which is fine, because nothing that i would do day to day would push it past 40%

 

Well, yes, but I do run Folding@home on it every day, for at least 18 hours a day. So it gets stressed 100% almost all the time. Do you guys think I should build a proper watercooling system here? Would it be any help/difference with temps and overclocking? I never done anything with watercooling before apart from this Corsair H50 I'm running now.

 

Intel quote a lot of specs that are ignored like vcore and QPI voltages. Example - Intel told me they recommend a QPI of 1.15v and anything over that is considered out of spec.

Synay - TBH I wouldn't bother with laying out extra cash for maybe a 200MHz increase if you're lucky with possibly around 10ºC decrease in temps. You'd also have to factor in the annual/biannual maintenance as well.

 

LOL, my iy 920 hits 85 degrees c on stock speeds, at load. 52 degrees c at idle.

 

lol greg vendor the stock cooler and use sumit decent. Water cooling would get it down to some resonable temps

72c is high in long term usage. And if you run folding your cpu is always capped at near enough 100% so your running prime95 18hrs a day as a comparison for the rest of its life. Eventually you will hit the point were it will collapse.

my brothers i750 is running at 4ghz at 52c at 100% load using water cooling.

 

I just lowered the Vcore to 1.4125V and it still seems very stable. As a bonus the CPU's temperature dropped to more rescpectable 58 degrees. Now I can see that Vcore was never a problem, will try with VTT as Bindi said. For now my config is as follows:

Multiplier: 20
CPU frequency: 200
PCIE frequency: 100
QPI frequency: 4800GT/s
MCH strap: 1600Mhz
Vdroop: Enabled
Vcore: 1.4125V
CPU PLL: 1.9V
Everything is left as either default or auto.

Any suggestions where can I improve? As Big Elf said - no point on spendin extra cash now. Will try to get as much as I can from what I have.

 

I'm only familiar with overclocking a Core i7 but if it works in a similar way then reduce the RAM frequency as low as it will go. You should be able to reduce the VTT and also it's likely you could reduce the vcore as well. 1.41v seems high for 4GHz.

 

leave as is and be happy 58c is a decent result well done

 

mine hits 55-60 at only 3.8GHz and thats with a fenrir and an antec1200 so i'd be happy with it tbh

 

58c is really good for 4GHz. In comparison, my 920 with stock voltages - although I suspect the Rampage overvolts anyway,runs alot hotter at 67c with ht on. I'm actually going to revamp the system in a couple of months with the usual TJ07 + quad radiator idea. I'd say it was the next step in getting higher frequencies.