Sapphire has just unveiled a new variant of its R9 270X GPU, namely the new R9 270X Dual-X 4GB GPU, which features the same specifications of its previous counterpart, except the new 4GB model features double the RAM (obviously). Sapphire says that they have updated the card with 4GB of RAM to meet Battlefield 4 recommended specs, although I have yet to find an optimized game that requires more than 2GB.
The R9 270X Dual-X 4GB features 4GB of GDDR5 RAM that has been clocked in at 5.6GHz across a 256-bit wide interface and is capable of cranking out a bandwidth of 179GB/s. The card is a non-reference design, and features Sapphire’s Dual-X cooling solution which helps the card remain budget friendly while managing to keep things cool. The new card is expected to retail between $220 / €161 / £135 and $230 / €169 / £141.