That's good news for those who didn't believe that the 95☌ operating temperature of Zen 4 was by design. The standard 7950X, for example, clocks the CCD1 cores at 5.1 GHz and the CCD2 at 4.9 GHz, so around a 4% clock speed advantage for the original model.Īlso worth noting is that along with the lower TDP when compared to the standard 7950X (120W vs 170W), the 3D V-Cache part has also seen the TjMax lowered from 95☌ to 85☌. The V-Cache enabled CCD1 typically clocks at between 47 MHz, whereas CCD2, with the regular 32MB 元 cache, clocked its cores at 4900 MHz. Let's start with a look at the operating behavior of the 7950X3D during the Cinebench R23 all-core workload. So the focus is going to be on gaming performance as this is where the X3D part should shine. But when it comes to productivity, the 7950X3D is basically just a slightly slower version of the 7950X, as the primary CCD can't clock quite as high due to the V-Cache. All test systems were configured with a GeForce RTX 4090, Windows 11, and Resizable BAR was enabled.įor testing, we normally include a lot more application benchmarks than what you're about to see. We used the Gigabyte X670E Aorus Master for our 7950X3D testing, as AMD provided the supporting BIOS for that motherboard, paired with a DDR5-6000 C元0 kit. Out of interest, the 7950X3D was tested on an AM5 system with no updates, and we can confirm performance was poor, basically slower than the 7950X in all of the games tested, so you absolutely need the correct BIOS and chipset driver, as a minimum. You'll also need a 3D V-cache specific BIOS for your AM5 motherboard and the latest chipset drivers must be installed. Game Mode must be enabled and the Xbox Game Bar needs to be up to date, too. To ensure the processor works correctly, AMD recommends using the latest version of either Windows 10 or Windows 11. So the 7950X3D is really for those who want to work and play, and are looking for the best possible performance for both tasks out of a single chip. Meanwhile, the Ryzen 9 7950X will be faster for productivity work for the simple fact that all of its cores can clock higher. There won't be any latency issues, either, as there is no other CCD to communicate with. This is because the 7800X3D only has one CCD to manage, so you don't have to worry about how the operating system or game utilizes the CPU. The best gaming CPU is almost certainly going to be the 7800X3D, while the best productivity CPU will still be the standard 7950X. This makes the 7950X3D a CPU for quite a niche market, in our opinion, it's unlikely to be AMD's best gaming CPU, nor will it be their best productivity CPU. The problem, or rather challenge, is that it's imperative that the threads from games are processed by the CCD with 96MB of 元, with the cores in the second CCD being treated more as if they were like the E-cores on an Intel processor.ĭual CCD CPUs are already quite tricky when it comes to gaming and such applications can see a performance decline due to the large latency penalty when communicating across the Infinity Fabric. The 3D V-cache is stacked onto the regular 元 cache in the CCDĪs we saw with the Zen 3-powered Ryzen 7 5800X3D, AMD's first CPU to have 3D V-cache, the extra 元 means gaming performance has the potential to be significantly improved. The cores in the second CCD only get 32 MB. The cores in the primary CCD get the standard 32 MB, that's integrated into the CCD, plus the stacked 64 MB 3D V-Cache, for a total of 96 MB. In total, the 7950X3D packs 128 MB of 元 cache, but it's not split evenly across the two CCDs in the CPU package. But then only half the 7950X3D cores actually feature 3D V-Cache technology, so the comparison isn't that straightforward. The Ryzen 9 7950X3D is arguably the better deal at $700, as it costs $44 per core whereas the 7800X3D at $450 costs $56 per core, an almost 30% increase. There's no technical reason for it, perhaps binning, but it would seem that AMD is doing this simply to push buyers toward spending more on the 7950X3D or 7900X3D. Two other models with the extra cache, the Ryzen 9 7900X3D and Ryzen 7 7800X3D, were also part of the announcement but AMD is not sampling them yet and has delayed the release of the 7800X3D for another 5 weeks. Two months after AMD's announcement at CES 2023, the first 3D V-Cache enabled Zen 4 parts have hit the shelves, and we have the top-of-the-range Ryzen 9 7950X3D up for review.
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