I7 8700 multi-core enchancement

[ExalyThor]

Hi! I posted a topic in the past asking about running the i7 8700 and i5 8400 at their max turbo speed. Now that I learned a few things about multi-core enhancement on intel motherboards and what it does I'm curious if it works for locked cpus. For example, with that feature enabled in the bios the 8700k runs all cores at 4.7 rather than the 4.3 stock. For unlocked cpus is obviously useless but for locked ones even 200mhz are welcome.

[Princess Luna]

It does not work, the only increase in their boost frequencies you can possible make having in mind they are Locked processors is overclock the BCLK if you have a Z370/390 motherboard keeping original turbo boost multipliers.

 

That means the best you can do with the i7 8700 is have it go from the stock 4.289 (4.3ghz) to 4.425~4.445 all cores boost with a BCLK of 102.75~102.85 higher base clock than that the new micro-code implemented in Kaby Lake era will not allow it to boot.

 

This is how it looks like:

Spoiler

Single Core is of 192~193

[ExalyThor]

2 hours ago, Princess Cadence said:

It does not work, the only increase in their boost frequencies you can possible make having in mind they are Locked processors is overclock the BCLK if you have a Z370/390 motherboard keeping original turbo boost multipliers.

 

That means the best you can do with the i7 8700 is have it go from the stock 4.289 (4.3ghz) to 4.425~4.445 all cores boost with a BCLK of 102.75~102.85 higher base clock than that the new micro-code implemented in Kaby Lake era will not allow it to boot.

 

This is how it looks like:

  Reveal hidden contents

Single Core is of 192~193

Messing with bclk dropps the turbo completly. I know this from skylake. But if intel would allow it, they could go like 140 bclk thanks to how the cpu is designed.

[Mira Yurizaki]

16 minutes ago, TheSponyX said:

Messing with bclk dropps the turbo completly. I know this from skylake. But if intel would allow it, they could go like 140 bclk thanks to how the cpu is designed.

Messing with BCLK also touches everything else, which may not have the ways to create the clock speeds that everyone else wants. This is why you can't push BCLK very far before the system doesn't boot in many cases

[ExalyThor]

1 hour ago, M.Yurizaki said:

Messing with BCLK also touches everything else, which may not have the ways to create the clock speeds that everyone else wants. This is why you can't push BCLK very far before the system doesn't boot in many cases

Skylake was like lga 775 cpus. Just ram and cpu frecuency were affected. Pcie and other not.

[Princess Luna]

3 hours ago, M.Yurizaki said:

Messing with BCLK also touches everything else, which may not have the ways to create the clock speeds that everyone else wants. This is why you can't push BCLK very far before the system doesn't boot in many cases

 

2 hours ago, TheSponyX said:

Skylake was like lga 775 cpus. Just ram and cpu frecuency were affected. Pcie and other not.

Since Skylake the base clock only messes with memory and CPU, and the only reason you can't still get awesome overclocks from it is because in Kaby Lake Intel added a microcode that will prevent boot if you reach 103mhz on the base in locked chips.

 

That's Intel to you, artificially stops you from getting the most of your product to force you the more expensive one.