AMD’s Radeon RX 6600 appears in MXM form factor

One of the best graphics cards on the market, the Radeon RX 6600 has emerged in a rare MXM (Mobile PCI Express Module) form factor. Redditor SurfaceDockGuy (opens in new tab) somehow bought a Radeon RX 6600 MXM and broke it down to examine the interior. While the MXM form factor is most commonly found in laptops, this particular Radeon RX 6600 module is likely for eGPU enclosures or servers that accept the format.

AMD’s Navi 23 silicon, which measures 237mm², sits at the heart of the Radeon RX 6600. The Redditor noted that the Radeon RX 6600 MXM uses a 10-phase power system with what appears to be two NCP81022 4+1 voltage controllers in tandem. Therefore, it is likely that seven phases power the Vcore, while the remaining three phases target the GDDR6 or SoC. In addition, an integrated OnSemi 55A current stage manages each phase, as SurfaceDockGuy thinks. Therefore, it seems that HIS (High-tech Information System Limited) is the manufacturer behind the Radeon RX 6600 MXM.

According to the Redditor, the AMD driver detects the MXM as a vanilla Radeon RX 6600, so the stream processor count remains intact. In addition, it comes with four 16Gb Micron GDDR6 memory modules. However, the TDP is significantly lower given the compact form factor. The firmware reportedly fixes the TDP at 75W. In comparison, the desktop Radeon RX 6600 has a 132W TDP, while the mobile Radeon RX 6600M has 100W. Therefore, the MXM variant is the slowest of the trio. However, the Redditor could unlock the power limit through MorePowerTool, a popular Radeon tweaking and overclocking tool, and set the TDP to over 130W.

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