AMD RX 7600S: Navi 33 GPU with 8GB VRAM
German tech site ComputerBase has one of the first reviews of the discrete RDNA3 graphics for laptops.
It is now four months after the announcement of the Radeon 7000 series for laptops, and only now the laptop makers have begun shipping laptops with these graphics. Unfortunately, not yet shipping to customers but to reviewers.
The RX 7600S is an entry-level discrete graphics card with Navi 33 GPU on board. It has all the specs of a low-tier graphics, such as 128-bit memory bus (8GB capacity), PCIe Gen4 limited to 8 lanes and relatively low TDP. However, the 7600S variant is competing with NVIDIA Max-Q graphics, it is not even the fully unlocked variant. In fact, the RX 7600S is the slowest RDNA3 GPU thus far announced from whole series (including desktop).
As confirmed by AMD, the GPU features 28 Compute Units (1792 Shader Processors) and operates within 50W to 75W TDP limit. That said, this is not the full implementation of the Navi 33 GPU. According to CB, the laptop tested allows up to 95W peak TGP setting, but this value drops to around 83 watts with games that use ray tracing.
The system tested by CB is ASUS TUF Gaming A16 which is equipped with AMD Ryzen 7 7735H (Rembrandt-R Zen3 APU). This gaming laptop will also be available with Ryzen 7040HS (Phoenix Zen4) option later, but in terms of graphics the RX 7600S is the only option available. Moreover, this system is equipped with DDR5-4800 memory.
The review is focusing on comparing Radeon RX 7600S to GeForce RTX 4060 Laptop GPU. The RTX 4060 test system has max TGP up to 140W, but in real-world testing it averaged at 103W (107W max), while RX 7600S were 83/88 watts respectively. Interestingly, the clock speeds for both architectures were higher than 2.4 GHz: 2612 MHz for RTX and 2446 MHz for RX GPU.
At 70W TDP, both graphics cards offer similar performance in the 3DMark TimeSpy test, but the gap widens in favor of RTX 40 past this power level.
According to ComputerBase, the 8GB VRAM limit on RX 7600S is the biggest bottleneck for this mobile GPU, even greater than 8 PCIe lanes. The Radeon GPUs tend to require more VRAM to compete with RTX graphics, reports the reviewer.
Unfortunately, the GPU has no chance of competing with NVIDIA in ray tracing test, the RX GPU offers only half of the 4060’s performance. However, without ray tracing there is only a 6% (minimum texture option to avoid VRAM limit) to 13% difference (same texture settings) in terms of performance between both GPUs at 80W.
Check the full review with individual games and productivity tests by visiting the link below.