Need some OC Geniuses

[AmazinSuPa]

Hi all, so here's my issue. I'm doing stability test on Aida64. If I just stress the CPU, the temps stay around 55c after about an hour (at 5Ghz). My voltage is set to 1.34. So at that point everything is gravy. Once I add cache or FPU (individually or at the same time) to the stability test, I get blue screened either immediately or within a minute or two. Now I'm sure a lot people are going to suggest up'ing the voltage. Which does in fact work (I've tried), but I've got no interest in running my voltage at 1.4v for everyday use. Is there any other way I can adjust the cache and FPU settings so they don't blue screen me? Any help would be greatly appreciated. Thank you in advance.

 

My Specs:

i7-4790k delidded

MSI Gaming 5 z97

32GB DDR3 Hyper X Ram 1833

Arctic Liquid Freezer 240

[NrKj105]

you need more voltage , if it doesnt pass the Aida stability test your oc isnt worth setting on

[NrKj105]

OR
just create a custom turbo boost

[AmazinSuPa]

Like I said, I already tried that. And it does work, but again, I'm not keeping a constant load voltage of 1.44. That's why I ask if there's any other way to adjust the cache or fpu, to stabilize the system. Without adjust the voltage too much.

[AmazinSuPa]

I don't know what a custom boost is

[NrKj105]

in your bios you can set an intel turbo boost with your settings

[AmazinSuPa]

You sure about that? I was under the impression you were not supposed to enable intel turbo boost while overclocking.

[Damascus]

I would drop to 4.8ghz or something similar and keep voltage as-is or up the voltage.  1.4 isn't terrible for that chip

[wzrd]

@AmazinSuPa You can change the cache multiplier in the BIOS separately to the core multiplier. Tweaking this might help you achieve more stability, but the reason for the crashes is likely different.

 

FLOPS and cache read instructions take more clock cycles to complete, than the simple instructions used for the general CPU stress test, and so are more unstable at higher overclocks. Basically, overclocks that are stable for basic stress test instructions may not hold up under more complex FLOPS and cache loads.

 

5GHz is just a very high overclock for a 4790k, so good job. Unfortunately, the only way to keep it stable is to apply more voltage, and that amount of voltage isn't really feasible. In practice, I always run CPUs below max overclock for everyday use. You won't notice a difference between say 4.8GHz and 5GHz in terms of real world performance, but it will be much more stable.

 

For reference, Intel turbo boost is technology that allows CPU frequency to change based on load. Using turbo boost, CPUs boost up when under load, and back down when idle to save energy. You can use it to set a dynamic frequency range, but it can impact stability at the highest overclocks, so you should probably leave it off.

[AmazinSuPa]

I dropped it to 4.9, and dropped the vcore to 1.35 or something. It's completely stable now. thing is, I want to sell this badboy, and 5Ghz looks a lot better than 4.9. Can you please tell me how to change the cache multiplier in my bios? MSI gaming 5 z97. Thanks so much for your help, I really appreciate it.

[wzrd]

Well if you're determined to get it to 5GHz... 

 

I'm afraid I don't have any MSI motherboards to hand, but you should find it in the same place as your core multiplier. It will be listed as "cache ratio" or "cache multiplier", and I assume it will currently be set to "Auto".