Press Releases SAPPHIRE Speeds in with HD 4890 Apr 3rd, 2009-The SAPPHIRE HD 4890 series is based on a new GPU core from the ATI division of AMD with 800 stream processor units, 256-bit GDDR5 memory interface and integral hardware video decoder. It also features improved memory management architecture, and technical innovations that allow higher clock speeds and reduce standby power levels. ...read full press release