4 ms·
This is the main reason why, for example, the i7-7700K comes with a "base clock" of 4.2 GHz even though for most workloads the CPU will operate at 4.4 or 4.5 GH
by magila 10y ago
This is the main reason why, for example, the i7-7700K comes with a "base clock" of 4.2 GHz even though for most workloads the CPU will operate at 4.4 or 4.5 GHz. That 4.2 GHz represents the maximum speed the CPU can maintain when running the worst case AVX2 workload without exceeding the specified 91W TDP.
- old-gregg 10y agoInteresting... do you mind me asking: how does overclocking works these days then? We have P-states, i.e. the CPU will go from 1200Mhz... 2400Mhz to 4Ghz, then there's "trubo" frequency range. So does modern overclocking apply some kind of multiplier to all these steps? Thanks.
- wtallis 10y agoThere's a base clock that's usually something like 100MHz and can usually be tweaked by a few percent. The base clock affects all power states, and usually the memory and I/O (which is usually the limiting factor). On top of that is a CPU frequency multiplier that is variable and the upper limit is unlocked on certain processor and motherboard combinations. If you have an unlocked multiplier you can set the maximum multiplier for each of the Turbo states (1-core, 2-core, through all-cores). You could configure them to all be the same multiplier, or just scale up the default behavior of running at a higher clock speed when fewer cores are active.