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*** Turbo ratio by each core = good idea? ***

post #1 of 5
Thread Starter 
Hi fellow OC-ers:

On a P8P67 Pro, my 2500k does 5ghz @ 1.41v, nice but too risky for 24/7.

What if instead of overclocking all cores by same ratio, I set the ratio for each core individually so that:

1-core loaded ratio: 51x
2-core loaded ratio: 50x
3-core loaded ratio: 49x
4-core loaded ratio: 48x

Depending on load, this causes the CPU to change multipliers a lot, between 16x, 48x, 49x, 50x and 51x.

Questions:
  1. Will this harm the CPU / mobo? Or is it a good idea?
  2. What do air-cooling people in the 4.8 - 5ghz (Sandy Bridge) range set their Load-Line Calibration to? Mine's on Ultra High and I'm afraid its causing voltage spikes or stressing the mobo
post #2 of 5
How would you do that..? I have yet to find the option for it and I've had the board for 2 months now lol.

Nvm, I'm an idiot
Edited by LethalRise750 - 3/18/11 at 1:43am
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post #3 of 5
Just set the thing to 4.75GHz-4.83GHz and call it a day................
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post #4 of 5
People don't usually do that because it takes alot longer to test that for stability as then not only do you need to run a 4 thread blend test, but ALSO 3 thread, 2 thread and 1 thread all separately from each other. That's my reasoning at least.

I WAS considering that however, if you do try it please let us know how it turns out.
    
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post #5 of 5
Thread Starter 
Scropion u've hit the nail on the head. The tests u have to run for different combinations of 4, 3, 2 and 1 threads onto 4 different cores is a logistical nightmare and compltely impractical time-wise.


During my brief testing I found:

Set my multipliers in a descending fashion, where each less core uses 1x higher multiplier. I tested with Prime95 (2 worker threads, manually set affinity in Task Manager)

Even though I set 2-core multi to 50x, I was getting 48x to 49x with the 2 worker threads.

This is because when those 2 cores max out, Windows starts using the 2 remaining cores for itself, causing the multiplier to lower again.

And if 2 cores weren't maxing out, then u wouldn't need the increased multiplier in the 1st place.



My conclusion is what seemed a good idea is actually unworkable and pointless. Ah well
Edited by overclocktilyerdrop - 3/18/11 at 2:14pm
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