AMD Radeon R9 390 now offered with 4GB memory | VideoCardz.com
Sapphire Radeon R9 390 8 GB NITRO Video Card - Black / Silver for sale online | eBay
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UPDATE]AMD AIBs Prepare Cost Effective Radeon R9 390 Models With 4 GB Memory - Sapphire, XFX and PowerColor Ready With Custom Variants