Not so long ago, it was reported that a number of Chinese manufacturers began releasing GeForce RTX 30-series desktop video cards based on GPUs from mobile video cards of the same name. According to media reports, the same companies also began to manufacture and sell Radeon RX 6000 video cards on mobile GPUs in the same way.
Such alterations are offered much cheaper than full-fledged desktop models. Offers for the sale of mobile Radeon RX 6600M in the format of desktop accelerators flooded the AliExpress online marketplace. Such cards are sold for $180-200. In turn, the real models of desktop video cards Radeon RX 6600 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 variant. GPU frequencies are also very similar – both operate in the 2.4-2.5 GHz range. Even in the TDP settings of the video cards, there is no significant difference. For the mobile version, the power consumption level is up to 100 watts, and for real desktop versions – up to 132 watts. The amount of memory for video cards is also the same – 8 GB GDDR6 with support for a 128-bit bus and an effective frequency indicator of 14 GHz (14 Gb / s). So the whole difference essentially comes down to a slight modification of the BIOS.
Tech blogger Miyconst got hold of one of these homemade accelerators and checked his possibilities. As it turned out, the Radeon RX 6600M graphics chip as part of a desktop video card can be overclocked to a stable 2.5 GHz. However, memory overclocking does not work. When you try to change its frequency, the card goes into safe mode. At the same time, the GPU-Z utility defines the card as mobile.
Sellers of such video cards indicate support for the PCIe 4.0 x16 interface. However, true mobile and desktop variants of the Radeon RX 6600 only officially support 8 PCIe lanes.
Obviously, such models of accelerators are not officially supported by AMD itself, which is hardly happy with such enthusiasm from Chinese manufacturers. But since the driver for Radeon video cards will only check the authenticity of the PCI Device ID of the graphics chip, such cards are easily identified by the official AMD software as mobile discrete accelerators.
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