And a faster CPU to handle it all properly. 1.6ghz is sooooo low, whether it has p4 or i7 slapped onto it, that clock speed is dire for this game.
CPU cores get more efficient with every generation. This is talking about the efficiency of a CPU core at a given speed, and doesn't take into account things like multi-core CPUs, hyperthreading or turbo boost. It's all down to better CPU design, bigger CPU cache sizes and shrinking of the CPU die process (65nm -> 45nm -> 32nm -> 22nm).
Let's assume that each CPU generation is 10% more efficient than the last (at the same clock speed). If we say that a Pentium D (the first mainstream dual-core Intel CPU for desktops) does a given task in 1000ms @ 2.0GHz, we can figure out how quickly the subsequent CPU families perform the same task:
- Pentium D: 1000ms @ 2.0GHz
- Core: 909ms @ 2.0GHz / 1000ms @ 1.8GHz
- Core 2: 826ms @ 2.0GHz / 1000ms @ 1.65GHz
- Core i7 Gen 1: 751ms @ 2.0GHz / 1000ms @ 1.5GHz
- Core i7 Gen 2: 683ms @ 2.0GHz / 1000ms @ 1.36GHz
The performance gain between these Intel chips is not a constant 10%. It's probably anywhere between 2% and 15%, and definitely not the same between every generation. There was a fairly small jump between Pentium D and Core, but a bigger jump between Core and Core 2 or Core 2 and Core i7.
This is why so few games list a CPU speed on the box any more. Between the different CPU manufacturers and their product families, there's no way to say how fast 2GHz is more.
No dual core needs 2ghz, quad core is entirly different as there are more cores to handle the work meaning you don't need as fast of a speed. As I said BS never specified for quad core processors just dual core.
It depends on how the workload is split up. Skyrim only ever uses 2 threads of execution, so running on a quad core CPU doesn't give you any performance boost. You may see the game using more than 2 cores, but that's only because the Windows CPU scheduler is shifting the same 2 threads between multiple cores.