trying to OC i7 2600k with asrock fatal1ty P67

[grantsmith82]

HI all i am trying to OC my I7 2600k to around 4.7ghz but running into a few snags

i get the settings in and save boot win7 use f-stream and CPU-Z which both give me a 4700 clock speed however when i use prime95 to stress test the clock speed drops down to 4000 - 38000mhz

also the other odd thing is the bios doesnt recognise on the main screen the clock speed of 47000 ok on 4500 but it comes up as 3862mhz

could someone help me with the settings they have used on this please

[grantsmith82]

Re: trying to OC i7 2600k with asrock fatal1ty P67

No one???

[dolpli]

Re: trying to OC i7 2600k with asrock fatal1ty P67

what settings have you made for overclocking?

did you made any change for turbo boost power limit?

[grantsmith82]

Re: trying to OC i7 2600k with asrock fatal1ty P67

Hi for a 4.5ghz overclock i used the following settings

CPU Ratio Setting: manual
Max Ratio: 45
Internal PLL Overvoltage: Enabled
Internal speedstep technology disabled
turbo boost power limit auto
additional turbo voltage auto
core current limit 100
host clock override (BCLK) 100.0mhz
spread spectrum disabled
under voltage control
Power Save mode disabled
CPU Core voltage -1.304v offset mode
offset voltage -0.015v
CPU load-line calibration level2
DRAM voltage 1.560v
PCH voltage 1.059v (auto)
CPU Pull Voltage 1.709v
VTT voltage 1.051v (auto)
VCCSA voltage 0.925v (auto)
under CPU configaration i have...
intel hyper threading technology enabled
active processor cores all
hardware prefetcher enabled
adjacent cache line prefetch enabled
enhanced halt state (c1E) disabled
cpu c3 state support disabled
package c state support disabled
cpu thermal throttling disabled
intel virtualization technology enabled
no-execute memory protection disabled

this works fine (so far) stress tests fine and runs ok.... below are the settings i used for 4.8ghz OC
Note: if i did not enable Internal speedstep technology and put the turbo boost power limit MANUAL
with the long/short power limits when i did a stress test using prime95 the clock speed would drop to about 4ghz when i enabled these settings
the clock speed held at 4800 (googled the issue someone else fixed it by doing this)
these settings stress test fine but found just using pc normally windows, email watching movie on media player i kept getting blue screen crashes

CPU Ratio Setting: manual
Max Ratio: 48
Internal PLL Overvoltage: Enabled
Internal speedstep technology ENABLED
turbo boost power limit MANUAL
-short duration power limit(W) 180
-long duration power limit(W) 140
Lond duration maintained(sec) 1
additional turbo voltage auto
core current limit 100
host clock override (BCLK) 100.0mhz
spread spectrum disabled
under voltage control
Power Save mode disabled
CPU Core voltage -1.304v offset mode
offset voltage +0.015v
CPU load-line calibration level2
DRAM voltage 1.560v
PCH voltage 1.059v (auto)
CPU Pull Voltage 1.709v
VTT voltage 1.051v (auto)
VCCSA voltage 0.925v (auto)
under CPU configaration i have...
intel hyper threading technology enabled
active processor cores all
hardware prefetcher enabled
adjacent cache line prefetch enabled
enhanced halt state (c1E) disabled
cpu c3 state support disabled
package c state support disabled
cpu thermal throttling disabled
intel virtualization technology enabled
no-execute memory protection disabled

[dolpli]

Re: trying to OC i7 2600k with asrock fatal1ty P67

So you increased the turbo boost power limit (both short & long duration) and fixed the drop of clock speed, right?

What error code did you get for the blue screen? You may need to increase Vcore but should be careful about the temperature. Maybe it is already the limit of your CPU.
Are you sure that you set CPU core to offset -1.304v????

[grantsmith82]

Re: trying to OC i7 2600k with asrock fatal1ty P67

HI yes enabling Internal speedstep technology and putting the 180(short) and 140 (long) fixed the issue of the clock speed dropping under stres test. and it now hold nicely at x48


on the bios it says CPU Core Voltage +1.304v (sorry i think i put - before i just using the screen shot i took on my mobile to populate the info) then offset +0.015v

bluescreen error was
"a problem has been detected and windows has been shut down tio prevent danage to your computer

the system encountered an uncorrectable hardware error

if this is the first time you seen this error"... blah blah....

under stress test cpu only in low 60c (cpu is water cooled)

any suggestions on what settings to tweak to what?? 4.5ghz seems stable just the 4.8ghz is unstable both using above settings as prev stated

[dolpli]

Re: trying to OC i7 2600k with asrock fatal1ty P67

Yes, it's right to set increase the turbo boost power limits to fix the clock speed under stress. Indeed, by enabling speedstep the clock speed of CPU will be dropped to lower speed under idle (a power saving feature since you dun need the clock at full speed under low load, right?)

Your full load temp at 60C and it appears that your water block cooling is working well.

If you need to o/c to speed above 4.5 GHz, most sandy bridge CPU require voltage of 1.35 or more (be careful dun burn your CPU out! better set cpu thermal throttling enabled also). Try to keep PLL overvoltage enabled and change CPU Load-line calibration to Level 1.

It's much better to monitor the temp. under stress test (e.g. Prime95 FFT test) so that it's under 70C. Also keep your computer case well ventilated to cool down the MOSFET near the CPU.

[grantsmith82]

Re: trying to OC i7 2600k with asrock fatal1ty P67

what the max core voltage i should goto currently i amended to level1 and had to adjsut the offset voltage to +0.015 and currently running core voltage at 1.400v according to CPU-Z so far no crash

[dolpli]

Re: trying to OC i7 2600k with asrock fatal1ty P67

I am not sure but some ppl. said that to keep the Vcore below 1.35V is better. Voltage higher than that may make the CPU 'degraded' and the life span could be shorter.

BTW, I think you should ask a question: whether you really NEED to have high clock speed or you just WANT such high clock speed, in the expense of power consumption and risk of burning the silicon chip?