It ain't AMD's Navi, but four Radeon 600-series cards have appeared in its drivers
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AMD RX 640 spotted in new driver files | KitGuru
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AMD Radeon RX 640 | tonymacx86.com
220+mhz Overclock on RX 640 with stock cooler - 13% fps difference in Heaven (+300 mhz on VRAM) : r/overclocking
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