AMD has announced the new Ryzen 9 7945HX3D, the world's first notebook CPU with the company's 3D V-Cache technology. The 7945HX3D is essentially the 7945HX but with double the L3 cache. While the L1 and L2 cache remain at 1MB and 16MB, respectively, the L3 cache goes from the 7945HX's sizable 64MB to an impressive 128MB for a total of 145MB cache.
Introduced first on the Ryzen 7 5800X3D
desktop processor last year, the AMD 3D V-Cache technology essentially stacks
an extra layer of memory on the CPU die. While most apps show no improvement
from the added cache, games tend to benefit tremendously from it. The extra
memory on die means games don't have to access the slower and physically
distant system memory as often, resulting in faster processing of each frame
and higher frame rates overall.
The 7945HX3D is otherwise very similar to
the 7945HX. It has 16 Zen4 cores and 32-threads evenly split across two core
complexes. Like the 7945HX, the cache is also split across the two CCD but on
the 7945HX3D one CCD gets an additional 64MB of L3 cache, resulting in 96MB on
one CCD and 32MB on the other one. This also means that only one CCD with
8-cores is used for gaming, with the other CCD being parked unless expressly
requested by the program. This behavior is similar to the desktop 7950X3D and
7900X3D parts.
The 7945HX3D can boost up to 5.4GHz and
can be overclocked manually or automatically using AMD Precision Boost
Overdrive. Default TDP is 55W and can be configurable between 55W and 75W by
the notebook manufacturer. Max operating temperature has been reduced to 89°C
similar to other 3D V-Cache models as the extra memory layer prevents effective
heat dissipation and requires the chip to run cooler. The 7945HX3D will first
appear on the ASUS ROG Scar 17 starting August 22 and eventually on other
models worldwide.
