Hello, I have encountered a strange issue with my 5820k, on the gigabyte x99 gaming 5, where I am unable to increase my uncore (cache) frequency > 3.6GHz, even when raising the voltage significantly (1.2V would not POST). The system is currently stable with an uncore of 3.6GHz at 1.1V. Thank you
What's your CPU frequency and voltage?
I don't get the point of cache overclocking. Doesn't help that much, relative to CPU clock increases.
Cache overclocking doesn't usually help that much, if anything in benchmarks.
I know that some motherboards that don't have the OC socket type pincount can have issues with cache overclocking and voltage control.
I'd try to keep uncore voltage low as it might just push out more heat without giving you any performance benefits.
My settings are as follows on a x99 sabertooth.
baseclock = 100.64mhz
CPU strap = 125mhz
All active cores = 35 multi, Gives 4.4ghz under load.
Cache sits at 3.77ghz under load.
Load CPU voltage = 1.2v (0.9 when idle)
Static cache voltage = 1.04
Also enabled VR efficiency mode. Doesn't seem to affect stability for me.
That is exaly a well known issue with some 5820K´s.
The cache frequancy does not seem to overclock that well with some 5820k chips.
But yeah what @Zavar says.
i would personaly not realy botter too much about it.
I have readed somewhere that the max safe cache voltage should be arround ~ 1.25V.
this could ofc vary from cpu to cpu
But yeah not sure if its worth it.
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I can get mine to 3.8 at 1.05v. That's weird. I could hit 4.1 with around 1.15v, but that was unstable. I didn't notice as big of a difference unless I was compiling something though and even then core frequency is king.
My settings:
100mhz strap (to make use of the EPU feature)
42 multiplier (handles 4.3 at that voltage but I like 42 better than 43 lol)
1.1v
38 cache multiplier
1.05v
I can handle 4.7ghz at 1.3v but I need a way better cooler before I attempt that.
I've considered raising the BCLK to 125 but haven't seen the need to. Maybe that would help you?
Thanks alot guys, yeah it appears to be a dud at cache overclocking. I would not have expected that as I can reach a reasonable stable overclocking without too much voltage (4.4 on 1, 4.3 on 2-5 and 4.2GHz with all cores @ 1.092V). I will certainly continue to play with my uncore, but I will not be saltily looking at my motherboard haha
On a somewhat related note, do you manually set your CPU input voltage? Or will my motherboard effectively manage it for me? If not, what voltages do O have to take into account? Thanks
Setting input voltage to 1.9v is never a bad idea, increases the onboard VRM efficiency since it doesn't have to draw as much current for the same wattage.
Also might help stability a small tad.