Unexpected performence drop ....! i7 4790K

[OCing Noob]

Hi mates

i'm having some unexpected performance drop

 

so it starts like this i have always do 3 way OC test . after OCing i do a 30 mints stress test on Aida64 or XTU.

 

Then 2 hours of gaming

Then render a 7 hours 1080p project

if both passed then i put system on 12 hours stress test on Aida 64 or XTU

 

Problem: On 4.5ghz (1.1270v) the same project is giving me render time 1 hours and 30 mints

               On 4.7ghz (1.2100v) the same project is giving me render time 2 hours and 15 mints

 

My Rig: Ram OC 2133(1.60v) timings (10-11-10-30/RC2) Corsair

            Cooling :H100i stock fans

 

Plz advice

[kpreg]

Did you monitor the temps during the rendering? looks like throttling to me

[OCing Noob]

Did you monitor the temps during the rendering? looks like throttling to me

yeah when its was on 4.5ghz temps were 59C tops on 4.7ghz 65C tops .no change in fan speed or temp. ambient time 11C.

[kpreg]

yeah when its was on 4.5ghz temps were 59C tops on 4.7ghz 65C tops .no change in fan speed or temp. ambient time 11C.

Strange.

i_build_nanosuits maybe you could shed some light on this?

[airdeano]

sounds like your 4.7 is on one/two core, not all four cores.

[OCing Noob]

sounds like your 4.7 is on one/two core, not all four cores.

its on sync all core and  CPUz is showing 4698ghz . while rendering . Cpu meter is showing all core and HT on full load .

[Analog]

Sometimes more GHz does not mean more power. Perhaps just your processor doesn't benefit from a higher frequency and actually makes it worse. It could be also that the voltage is not enough to provide stable power for the processor to run properly. I have seen results in Cinebench rise by quite a bit just from an additional bump of the voltages so give that a try as well. 

[OCing Noob]

Sometimes more GHz does not mean more power. Perhaps just your processor doesn't benefit from a higher frequency and actually makes it worse. It could be also that the voltage is not enough to provide stable power for the processor to run properly. I have seen results in Cinebench rise by quite a bit just from an additional bump of the voltages so give that a try as well. 

i can totally understand what you are saying and its logical . if its stable on the voltage for 3+ hours on a stress test even then giving more voltage is an option ?

[Priller]

i can totally understand what you are saying and its logical . if its stable on the voltage for 3+ hours on a stress test even then giving more voltage is an option ?

 

Just increase the voltage slightly and see if your render times drop. If they do then you have the answer. It may stress the CPU differently then the stress testing you have done.