Not so long ago it was reported that a number of Chinese manufacturers started releasing GeForce RTX 30-series desktop graphics cards based on GPUs from mobile graphics cards of the same name. According to media reports, the same companies also began to manufacture and sell Radeon RX 6000 graphics cards on mobile GPUs in the same way.
Such conversions are offered significantly cheaper than full-fledged desktop models. Offers for the sale of mobile Radeon RX 6600M in the format of desktop accelerators flooded the online marketplace AliExpress. Such cards are sold for $180-200. The real models of the desktop graphics cards Radeon RX 6600, in turn, are offered in the same stores for about $ 270. The difference is quite significant, especially considering the almost identical characteristics of mobile and desktop models.
The mobile Radeon RX 6600M uses the same Navi 23 graphics chip with 1792 stream processors as the current desktop version. The GPU frequencies are also very similar – both operating in the 2.4 to 2.5 GHz range. There is also no significant difference in the TDP settings of the graphics cards. With the mobile version, the power consumption is up to 100 watts and with real desktop versions up to 132 watts. The memory capacity for video cards is also the same – 8 GB of GDDR6 with support for a 128-bit bus and an effective frequency display of 14 GHz (14 Gb / s). So the whole difference is essentially due to a slight change in the BIOS.
Tech blogger Miyconst got hold of one of these homemade accelerators and checked its possibilities. As it turns out, the Radeon RX 6600M graphics chip can be overclocked to a stable 2.5 GHz as part of a desktop graphics card. However, memory overclocking does not work. If you try to change the frequency, the card will go into safe mode. At the same time, the GPU-Z utility defines the card as mobile.
Sellers of such graphics cards indicate support for the PCIe 4.0 x16 interface. However, real mobile and desktop variants of the Radeon RX 6600 officially only support 8 PCIe lanes.
Obviously, such accelerator models are not officially supported by AMD itself, which is hardly satisfied with such enthusiasm of Chinese manufacturers. However, since the driver for Radeon graphics cards only verifies the authenticity of the graphics chip’s PCI device ID, such cards are easily identified as mobile discrete accelerators by AMD’s official software.