Desktop 65-W APU Ryzen 7 4750G outperforms 105-W Ryzen 7 3800XT
Hybrid desktop processors (aka APUs) from AMD rarely deserve close attention. Their performance against the background of full-fledged company solutions has always left much to be desired. However, with the new Renoir-G series, the announcement of which is expected very soon, everything can change. It seems that these processors will even be able to win the attention of enthusiasts.
According to the results contained in the SiSoftware test database and discovered by TUM_APISAK, an Internet detective, the performance of the Ryzen 7 Pro 4750G desktop hybrid model is slightly higher than the performance of the full-fledged Ryzen 7 3800XT, which was recently introduced by AMD.
It should be noted that both processors use the same Zen 2 microarchitecture and are built using the 7-nm manufacturing process. Both chips have eight cores and 16 threads, but operate on different frequency ranges and have different cache sizes.
The Ryzen 7 3800XT (Matisse) is equipped with 32 MB of L3 cache. The base frequency of the processor is 3.9 GHz. In automatic overclocking, it can increase to 4.7 GHz. The official exact specifications of the Ryzen 7 Pro 4750G APU are unknown. However, the chip has already managed to appear in the database of some retailers, where it is noted that it has 8 MB of L3 cache, a base frequency of 3.7 GHz, and is also capable of automatically overclocking to 4.4 GHz. In addition, the Ryzen 7 Pro 4750G has an integrated graphics subsystem based on Radeon Vega cores and has a TPD level that is 40 watts lower than the value stated for a full-fledged desktop model (105 watts).
What is the fundamental difference between the Ryzen 7 Pro 4750G and Ryzen 7 3800XT processors? It’s all about the layout. The first uses a monolithic crystal design, the second uses a set of chipsets that are combined with a separate I / O chipset via the AMD Infinity Fabric bus.
In the computational test (Processor Arithmetic), the Ryzen 7 Pro 4750G model showed a result of 303.90 GOPS. The Ryzen 7 3800XT, in turn, demonstrated performance between 301.33 and 304.97 GOPS. At first glance, this result may seem very impressive, especially considering that the Ryzen 7 3800XT has higher clock speeds and a larger TDP margin compared to the Renoir-G model. But there is an obvious explanation for such a result.
In the Ryzen 7 3800XT, the chipsets have to interact with each other through the Infinity Fabric bus, which creates delays. When using the traditional monolithic architecture of the crystal (like the Ryzen 7 Pro 4750G), delays in operations are also present, but they are much lower than when using chipsets. The monolithic design of the Ryzen 7 Pro 4750G crystal can really give this processor an advantage in performance in certain operating scenarios, but in real conditions when using everyday applications this chip will still be slower than the Ryzen 7 3800XT. Especially when you consider the presence of a larger cache in the latter. However, in any case, you need to wait for the full announcement of the desktop Renoir and only then draw the final conclusions.
Even if, as a result, the eight-core APU lags 10-15% from the full Ryzen 7 3800XT, then for AMD this will be a real victory. Ultimately, Renoir is not positioned as a replacement for the Matisse desktop. But they may be an affordable option for exploring the architecture of Zen 2, which as a bonus offers an integrated graphics subsystem.
According to the German retailer Centralpoint, desktop Renoirs will go on sale on July 17th. In other words, the official announcement of these processors is expected in the coming days.
