4 ms·

Extreme frequency records are often made with many cores turned off e.g. http://hwbot.org/submission/2294034_andreyang_cpu_frequency_fx_8150_8709_mhz http://hwb

Extreme frequency records are often made with many cores turned off e.g. http://hwbot.org/submission/2294034_andreyang_cpu_frequency_fx_8150_8709_mhz http://hwbot.org/submission/2294034_andreyang_cpu_frequency_... But interestingly, the absolute first place winner had all 8 cores enabled http://hwbot.org/submission/2615355_the_stilt_cpu_frequency_fx_8370_8722.78_mhz/ http://hwbot.org/submission/2615355_the_stilt_cpu_frequency_... You obviously don't have to cut the cores in half for daily usable overclocking. My quad Skylake runs 4.5GHz with all four cores enabled.

deleted 10y ago
[deleted]
jankotek 10y ago
I was not very precise. I actually meant heat-spreader instead of heat-sink. Kaby Lake has bad thermal conductivity between silicone and heat-spreader (metal top of CPU). If you crack-open the CPU and replace thermal paste, it will reduce temperature under load significantly. It is common problem for Intel CPUs since Ivy Bridge. i7 are affected. Extreme version is soldered and does not have this issue.
- floatboth 10y ago
  I know about delidding. I thought this: > You literally have to cut this CPU in half, to make it usable for OC. referred to turning off the cores, not delidding :D But you don't need to do either to "make it usable for OC". Just get a good cooler.
  - jankotek 10y ago
    Good cooler wont help, the bottleneck will be in CPU.
    - floatboth 10y ago
      I'm running 4.5GHz @ 1.4V on an i5-6400, doesn't get hotter than 60 degrees under full load with a watercooler.
      - jankotek 10y ago
        60 degrees is not much, not really reaching full potential of that chip. I had i7 2600K at 5.0 GHzx. Water cooled, 90 degrees under full load. It worked for 5 years 24/7, until motherboard died last year, CPU still works. It is simple to set higher frequency, but that does not mean CPU is actually faster. Power management is very tricky. Sometimes it will put idle instructions, or turbo boost would not work. You have to run benchmark for several hours to verify CPU is actually faster.

deleted 10y ago

[deleted]

jankotek 10y ago

I was not very precise. I actually meant heat-spreader instead of heat-sink. Kaby Lake has bad thermal conductivity between silicone and heat-spreader (metal top of CPU). If you crack-open the CPU and replace thermal paste, it will reduce temperature under load significantly. It is common problem for Intel CPUs since Ivy Bridge. i7 are affected. Extreme version is soldered and does not have this issue.

floatboth 10y ago
I know about delidding. I thought this: > You literally have to cut this CPU in half, to make it usable for OC. referred to turning off the cores, not delidding :D But you don't need to do either to "make it usable for OC". Just get a good cooler.
- jankotek 10y ago
  Good cooler wont help, the bottleneck will be in CPU.
  - floatboth 10y ago
    I'm running 4.5GHz @ 1.4V on an i5-6400, doesn't get hotter than 60 degrees under full load with a watercooler.
    - jankotek 10y ago
      60 degrees is not much, not really reaching full potential of that chip. I had i7 2600K at 5.0 GHzx. Water cooled, 90 degrees under full load. It worked for 5 years 24/7, until motherboard died last year, CPU still works. It is simple to set higher frequency, but that does not mean CPU is actually faster. Power management is very tricky. Sometimes it will put idle instructions, or turbo boost would not work. You have to run benchmark for several hours to verify CPU is actually faster.