In January, at CES 2022, AMD unveiled a new generation of APU processors, codenamed Rembrandt. It is characterized by the use of a slightly improved CPU architecture – Zen 3+ and a completely new architecture of the integrated graphics chip. The good-natured Vega, with good performance in lower-level games, was eventually replaced by the RDNA 2 architecture, which scales nicely. Thanks to this, the new Rembrandt processors were significantly modified, because with the arrival of the new iGPU a number of improvements were introduced, especially with regard to multimedia facilities. Today, the official premiere of the 5th generation APU is taking place, and at PurePC.pl we present the first performance results of the integrated AMD Radeon 680M chipset.
Author: Damian Mrosiak
Perhaps the only written medium in Poland, today we present the performance results of the Radeon 680M graphics chip. Meanwhile, we’ll focus solely on the iGPU, leaving the topic of the AMD Ryzen 7 6800H processor for another day (a deep dive into Zen 3+ architecture, performance, temperature, and power consumption). For the four generations of Zen architecture in the APU, the integrated graphics chips used the Vega architecture. Initially at 12 nm, then submitted to the 7 nm TSMC process, which increased its efficiency while maintaining significant energy efficiency. After 4 years, it was time for far-reaching changes, as a result of which we received a Rembrandt APU with iGPU systems, based on the RDNA 2 architecture. i7-11370H). The results, though varied, on the overall account are a very big disappointment to me. In conclusion, we will identify the reasons why the iGPU is not performing as we can expect from the new architecture.
AMD Radeon 680M is the latest integrated graphics chip, based on the RDNA 2 architecture and part of the Rembrandt APU. In our first test, we’ll focus on its performance against AMD Radeon Vega 8 (APU Cezanne) and Intel Iris Xe Graphics (Tiger Lake-H35).
Before we move on to the performance tests, let’s talk for a moment about the changes the Rembrandt APU has brought about. Changing the integrated graphic layout allowed a number of changes to the multimedia facilities. The new iGPU fully supports 10-bit HEVC codec as well as the newer and more efficient AV1 codec. There is no shortage of support for HDMI 2.1 and DisplayPort 2.0 ports. The processors received a new DDR5 and LPDDR5 memory controller, as well as support for the PCIe 4.0 bus with the ability to place up to three PCIe 4.0 SSD buses in the laptop. On the other hand, Rembrandt processors will not change in terms of the basic configuration. Here we get 6- and 8-core modules with support for up to 12 or even 16 threads at once. While Zen 3+ cores are stronger and more power efficient, we undoubtedly have a very interesting comparison with the 12th generation Intel Alder Lake-P and Alder Lake-H, which bring a maximum of 14 cores with support for up to 20 thread pointer.
The integrated graphics chips, based on the RDNA 2 architecture, were divided into two groups. In the first we find the AMD Radeon 660M model with 6 compute units and clock speeds up to 1900MHz. The Radeon 660M will be part of the AMD Ryzen 5 6600U and AMD Ryzen 5 6600H(S) processors. The second set of iGPUs are Radeon 680M models with 12 compute units and clocked at 2200MHz for the Ryzen 7 (R7 6800U / R7 6800H(S)) or 2400MHz for all Ryzen 9 family units (Ryzen 9 6900HS / Ryzen 9 6900HX / Ryzen 9 6980HX). / Ryzen 9 6900HS / Ryzen 9 6980HS). We ran performance tests on a Radeon 680M chip in the Ryzen 7 6800H APU, which means it has 12 CU blocks and a base clock speed of 2200MHz. The APU is paired with DDR5 4800MHz memory.
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