Meanwhile, the SRAM-stacked CCD will operate at a slightly lower clock rate than the rated boost for the chip but satisfy the needs of applications that respond best to low-latency access, like games.
#Zen 4 integrated graphics full#
However, AMD's new design allows the chiplet without the 3D-stacked SRAM to operate at full speed, thus delivering the high boost clocks we see on the spec sheet for applications that prize frequency. The 3D V-Cache chiplet results in lower performance due to the thermal challenges you can read about here. In contrast, AMD disables L2 cache slices in tandem with the cores, so the 7900X3D has 12 MB of L2 while the 7950X3D has 16 MB. It also has more 元 cache-per-core on the normal die, too. AMD still doesn’t allow direct frequency overclocking due to a voltage limitation for one of the chiplets.Īs you can see in the table above, the Ryzen 9 7900X3D's 3D V-Cache equipped chiplet actually has more cache-per-core than the 7950X3D, with 16 MB-per-core for the 7900X3D and 12 MB-per-core for the 7950X3D. The iGPU also doesn't benefit from the 3D V-Cache tech because it resides on the I/O die and can't access the 元 cache, so performance is the same as the regular Ryzen 7000 processors, as you can see in our iGPU testing.ĪMD only allowed overclocking the memory and Infinity Fabric for the previous-gen 5800X3D but will now also allow both the auto-overclocking Precision Boost Overdrive (PBO) and Curve Optimizer. The Ryzen 9 7900X3D's RDNA 2 integrated GPU comes with two compute units, 4 ACE, and 1 HWS, so it doesn't have the necessary horsepower to benefit from faster CPU cores - this unit is entirely GPU compute-bound. The 7900X3D doesn’t come with a bundled cooler - AMD recommends a 280mm water cooler, or better, for the Ryzen 7000X3D processors. In fact, the 7900X3D’s maximum supported temperature is 89C, lower than the 7900X’s limit of 95C. The power reductions aren’t entirely surprising, as the additional cache chiplet results in slightly higher operating temperatures that need to be kept within a safe range. The 4.4 GHz base clock is also 200 MHz higher than the 7950X3D but 300 MHz lower than the 7900X, a necessary accommodation for the lower power envelope.ĪMD’s Zen 4 3D V-Cache processors all have a base TPD of 120W and a max 162W PPT, meaning the 7900X3D’s ratings are 68W lower than the 170W/230W rating for the standard 7900X. The first-gen X3D chip suffered from a low boost clock, but AMD has significantly increased the boost clock frequencies with the new X3D models - the 7900X3D boosts to 5.6 GHz, the same as the standard 7900X but 100 MHz lower than the 7950X. You can read the finer-grained details of the second-gen 3D V-Cache technology and the 6nm I/O Die (IOD) here.
The additional 元 cache chiplet is fabbed on the 7nm process and has a peak bandwidth of 2.5 TB/s.
#Zen 4 integrated graphics software#
On the surface, the 7900X3D appears to merely be a Ryzen 9 7900X with an extra 元 cache chiplet and additional silicon and software tuning, but it has plenty of unique characteristics compared to the other 3D V-Cache chips.Īs with all other 3D V-Cache chiplets, the 3D-stacked SRAM 元 chip weighs in at 64MB, so the 7900X3D comes with a beastly 144MB of total cache, and 128MB of that is gaming-boosting 元 cache. The Ryzen 9 7900X3D has 12 cores and 24 threads and drops into the AM5 socket.
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