AMD Ryzen 9 7950X3D Desktop Processor (16-core/32-thread, 144MB cache, up to 5.7 GHz max boost)

Product Information

When it comes to the Intel Core i9-13900K, it too outperforms the 7950X3D in single core performance, with the 7950X3D running about 12% slower than the 13900K on average. The difference between the two tightens on multicore performance, with the 7950X3D running about 5% slower in multicore on average. Or maybe the Ryzen 9 7900X3D or Ryzen 7 7800X3D might be. I've yet to test the other cache-heavy chips, but if they can deliver the same gaming and efficiency uplifts as this one then they're going to make more sense to a PC gamer. The 7900X3D has the same asymmetrical chiplet layout, so has the same compromises for productivity, but the 7800X3D is a pure 3D V-Cache gaming beast. If you ain't rendering in Blender, that's likely to be the best of the bunch for you. If we're talking about this being AMD's take on the perfect gaming processor, we need to step outside of the 1080p gaming environment. We traditionally test at this lower resolution for our CPU game benchmarking so we are able to highlight the difference in performance down to the actual processors. As you go higher in the resolution scale you end up relying ever more on the power of the graphics card, to the point where you cease being able to discern meaningful performance deltas between chip architectures. In terms of power draw, the minimum I recorded for the 13900K is a meager 2.882W, and it could hover around this for hours if you're not using your computer thanks to its energy-efficient hybrid-core design. Meanwhile, the 7950X3D is still slurping up just over eight times as much power as a baseline.

If your BIOS has any specific X3D options called Core Flex, Gaming preset etc, leave those disabled. The Xbox Game Bar contains a KGL (known good list) of games that it detects when active, thus triggering Game Mode (you can also instruct the game bar to recognize unknown games and/or other applications as games). The driver communicates with the Windows Game Mode feature, which becomes active when the Xbox Game Bar detects a game is running.

Verdict: Cache Grab, But No Clean Getaway

Make sure the BIOS is up to date and the Default BIOS options will be optimal for X3D, however the specific settings you can confirm are set correct are: CPPC = Auto / CStates & DFStates = Auto. If you didn't change these, they should be set correctly anyway.

Cache has been an essential and highly influential part of computers for decades now, and its importance is unquestionable. What is questionable, however, and what has been questioned since the beginning, is how much cache is enough. Some argue that you can never have enough, but this is illogical. More cache means a larger, or in this case, an extra, chip—and that leads to higher costs. Past a certain point, it becomes questionable if the CPU will even be able to use or take advantage of all the cache you have. Both the 7950X3D and the 7900X3D have two eight-core Core Compute Die (CCD) chiplets, marking the first time AMD has brought the 3D V-Cache tech to a multi-CCD processor. The above image shows that AMD only mounts a single 7nm SRAM chiplet atop one eight-core CCD, leaving the other CCD bare. Perform a clean installation of Windows. Things will work better rather than using an old OS that was used for a different CPU. This bit is important, so don't overlook it, otherwise you might need to use something like Process Lasso. I recommend the latest Windows 11 22H2 build, which I use with my 7950X3D. I've tested Windows 10 vs 11, and 11 is clearly faster in gaming so if you are on 10 take this into consideration. You need to use a supported Windows 10/11 build or later. These are the earliest supported versions, so if you are using a version that predates these, you'll need to update.The fact performance of X3D CPU is all over the place bothers me too. Yes it's fast in -some- games, but then you get less overall performance in several important applications. If I just used my PC for gaming, I would have bought a console, I don't like the idea of having to make a trade-off with X3D CPU.