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 Could Release Radeon RX 640 Graphics Card Before Navi; Could Be Another Polaris Refresh - Lowyat.NET
AMD Radeon RX 640, Radeon RX 630 Spotted in Driver Update Code | Technology News
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