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4GHz CPU Battle: Ryzen 3900X vs. 3700X vs. Core i9-9900K
Instructions Per Cycle
IPC stands for "instructions per cycle" and it can be a good indicator of a processor's architecture efficiency. Traditionally Intel Coffee Lake CPUs have offered high IPC coupled with a high operating frequency and that's the best combination for maximum performance. Although AMD is still trailing when it comes to frequency, they appear to have closed in and possibly exceeded Intel's IPC performance with the third generation Ryzen update.
To see how much headway AMD's made here, we're going to neutralize as many variables as we can, while also keeping things as realistic as possible.
The first and most obvious step is to remove core frequency from the equation and to do this we've locked all CPU cores at 4 GHz. Any type of boost technology has been disabled, meaning the cores cannot go past 4 GHz and all cores are clocked at 4 GHz. Then for the Ryzen 9 3900X we've disabled two cores in each chiplet, taking it from an 12-core part down to an 8-core part. All CPUs tested will have 8 cores active, but where the 3700X has them all in a single die, the 3900X spreads the cores across two dies (two 4-core chiplets).
The 3rd-gen Ryzen CPUs have been tested on the Gigabyte X570 Aorus Xtreme using the AGESA 1.0.0.3AB BIOS revision, 1st and 2nd-gen Ryzen have been tested on the Asus ROG Crosshair 7 Hero, and the Coffee Lake CPUs on the Gigabyte Z390 Aorus Ultra. All configurations used the same G.Skill FlareX DDR4-3200 memory using the xtreme memory profile and the same MSI GTX 2080 Ti graphics card.
A small disclaimer we like to add for this kind of article: we're testing purely for the science of it and this is not buying advic
