PC Games Hardware (PCGH) discovered that certain AMD Radeon RX 9070 graphics cards can be flashed with the video BIOS of RX 9070 XT of a comparable board design, to achieve higher clock speeds and power limits. While the flash won't unlock any new shaders—you're still limited to 56 CU or 3,584 stream processors—it gives the RX 9070 increased power limits and clock speeds of the faster SKU. More importantly, the flashed RX 9070 was found to offer significantly improved overclocking headroom, and PCGH was able to tune up performance by 15-20% over stock RX 9070, bringing its performance to match a stock RX 9070 XT, which was confirmed by a set of 3DMark benchmarks.
There are, however, some caveats. The most obvious one is that BIOS flashing is fraught with risks, and unless you have a card with dual-BIOS, you really need to know what you're doing. Secondly, BIOS flashing might only work between two cards that share a common board design. AMD board partners tend to use nearly identical board designs between the RX 9070 and RX 9070 XT, at least for the value segment SKUs.