Core i5 6600T Cache Speed reduced when using SkyOC

Xaltar wrote: This thread is a bit old but I have learned a bit about sky OC since I last posted in here.  Enabling Sky-OC lowers the cache multiplier to allow more overclocking headroom. This is by design. If this were not the case your cache multiplier would be locked at the maximum turbo multiplier of the CPU, not an issue on pentium and celeron class CPUs where this is 1:1 but on all CPUs with turbo boost it can result in obscenely high cache frequencies. For example: i5 6400 Stock core multiplier: 27 Turbo core multiplier: 33 Cache multiplier: 33 Without Sky-OC enabled (feature no longer supported) the cache multiplier remains at 33 while the core multi is locked at 27 so the result: BCLK: 150  Core: 150 x 27 =  4.05ghz Cache: 150 x 33 = 4.95ghz  And the difference between core and cache frequencies grows even further the higher you set your BCLK. This means that your cache will hold back your OC headroom long before you reach the maximum OC your core can handle. With Sky-OC enabled however the cache multiplier is lowered to a point where it will not hold back your overclocking potential. The problem is that it does lower your cache performance quite significantly until reach or surpass the stock Cache frequency by raising your BCLK. Sky-OC has been discontinued by ASRock and is no longer supported so use at your own risk if your board still has the feature.

Nimbus wrote: Sorry to necropost but I have the same problem. Aida and Memtest shows low cache speed when BCLK overclock. May somebody help me with that?

You've given us zero information about your situation. Which mother board and CPU you use, the BCLK, CPU Core Ratio, Cache Ratio, and memory speed settings.

What cache speed do you see in Aida and Memtest, that is different than what you see elsewhere? What other programs are you using to monitor the CPU and cache speed? Do you see the correct Cache clock speed in the UEFI/BIOS, and in other programs besides Aida and Memtest?

Don't forget when BCLK over clocking, you sacrifice some of the processor monitoring values, like VCore. But I've never heard of the Cache clock value being read wrong.

Just now turned a "ticket" into Aida.

Those scores look about right. My 6600K gets 1921 single core at its maximum boost of 3.9 and ~7100 multi core @3.6ghz. I don't have a Z chipset board to try overclocking for comparison at the moment though.

No need, clearly there are performance gains and they look to be within the realms of what I would expect to see with an overclock of 500 - 700mhz. It would seem that only certain workloads would be effected by the lower cache performance. I guess so long as you are not performing any of those tasks the overclock is still well worth it.