Safe voltages for i5 750?

[35g700]

I'm trying to push my i5 750 to a stable 4.2GHz. I've managed to get it stable but the voltage is around 1.35. Is 1.35 to high for an i5 750?

Stepping: 5
Revision: B1

 

[farinha]

I don't think so...
Can you post your definitions from BIOS? Memory too? I've been trying to OC my i5 but without much success...
Thanks

 

[PP Mguire]

Max safe voltage for the chip is 1.45v. Mine is sitting at 1.4125 (GB is weird like that) with a 4.2ghz clock under air. Anything over 1.45v is doable but not recommended unless your under at least water. If you have DDR3 2000 for RAM then set your turbo on, put the bclk at 200, and the turbo will bump the multi for a 4.2ghz clock.

 

[35g700]

Thanks for the help guys.


So I ran a stress test at 4.2GHz however I had to have the voltage at 1.39ish for it to run stable. This was causing me to get temps of 80C-90C under load in Intel Burn Test. So I ended up dropping it down to 3.8GHz and bringing the voltage down to 1.312 and in Intel Burn Test the highest temps I got were around 72C so I think 3.8GHz is the highest I'll be going with my Xigmatek rifle.

@ Farinha

Ai Overclock Tuner - Manual
OC From CPU Level UP - Auto
CPU Ratio Setting - 21.0 (default is 20.0)
Intel (R) SpeedStep (TM) Tech - Disabled
Xtreme Phase Full Power Mode - Enabled
BCLK Frequency - 180
PCIE Frequency - 100
Dram Frequency - Auto
QPI Frequency - Auto
ASUS/3rd Party UI Priority [Asus Utility]

OC Tuner - Turbo Profile

DRAM Timing Control - Auto

CPU Differential Amplitude - Auto
CPU Clock Skew - Auto

CPU Fixed Voltage - 1.31875
IMC Voltage - 1.28750
DRAM Voltage - Auto
CPU PLL Voltage - Auto
PCH Voltage - Auto
DRAM DTA REF Voltage on CHA - Auto
DRAM DTA REF Voltage on CHA - Auto

Load-Line Calibration - Auto

Advanced CPU Config Settings

CPU Ratio Setting - 21.0
C1E Support - Disabled
Hardware Prefetcher - Enabled
Adjacent Cache Line Prefetch - Enabled
Max CPUID Value Limit - Disabled
Intel (R) Virtualization Tech - Enabled
CPU TM Function - Enabled
Execute-Disable Bit Capability - Enabled
Active Processor Cores - All
A20M - Disabled
Intel (R) SpeedStem(TM) Tech - Disabled
Intel (R) C-STATE Tech - Disabled

 

[farinha]

Thanks
One last question, which values have you used for RAM timings?

 

[35g700]

DRAM Timing Control

1st Information : 8-8-8-20-4-20-4-60-9-7-17

2nd Information : 1N-67-69

3rd Information : 5-5-15-10-10-10-7-6-4-7-7-4

All the other settings are set to Auto.

 

[farinha]

Thanks a lot. I'll give it a shot tomorrow.

 

[PP Mguire]

Thanks for the help guys.


So I ran a stress test at 4.2GHz however I had to have the voltage at 1.39ish for it to run stable. This was causing me to get temps of 80C-90C under load in Intel Burn Test. So I ended up dropping it down to 3.8GHz and bringing the voltage down to 1.312 and in Intel Burn Test the highest temps I got were around 72C so I think 3.8GHz is the highest I'll be going with my Xigmatek rifle.

@ Farinha

Ai Overclock Tuner - Manual
OC From CPU Level UP - Auto
CPU Ratio Setting - 21.0 (default is 20.0)
Intel (R) SpeedStep (TM) Tech - Disabled
Xtreme Phase Full Power Mode - Enabled
BCLK Frequency - 180
PCIE Frequency - 100
Dram Frequency - Auto
QPI Frequency - Auto
ASUS/3rd Party UI Priority [Asus Utility]

OC Tuner - Turbo Profile

DRAM Timing Control - Auto

CPU Differential Amplitude - Auto
CPU Clock Skew - Auto

CPU Fixed Voltage - 1.31875
IMC Voltage - 1.28750
DRAM Voltage - Auto
CPU PLL Voltage - Auto
PCH Voltage - Auto
DRAM DTA REF Voltage on CHA - Auto
DRAM DTA REF Voltage on CHA - Auto

Load-Line Calibration - Auto

Advanced CPU Config Settings

CPU Ratio Setting - 21.0
C1E Support - Disabled
Hardware Prefetcher - Enabled
Adjacent Cache Line Prefetch - Enabled
Max CPUID Value Limit - Disabled
Intel (R) Virtualization Tech - Enabled
CPU TM Function - Enabled
Execute-Disable Bit Capability - Enabled
Active Processor Cores - All
A20M - Disabled
Intel (R) SpeedStem(TM) Tech - Disabled
Intel (R) C-STATE Tech - Disabled

Stress testing programs put to much stress on a CPU and isnt exactly realistic. Make sure your heatsink is seated properly with a fresh dose of TIM and then retest it with some gaming or a benchmark like 3DMark. My temps get in the 80s even with a TRUE120 and dual Noctua fans but im not exactly worried about it because i know a few things about my CPU. Like for instance i know core 4 shows temps higher than what they actually are. I also know that my CPU doesnt get that hot even when im intense gaming (besides Supreme Commander). Besides Supreme Commander my temps never go above 75c.