Gigabyte offers GeForce GTS 450 with 512MB | VideoCardz.com
GEFORCE GTS 450, 128bit 4GB Graphics Card, Automatic Recognition Video Memory Card, Low Noise and Quiet Work, Strong and Durable, with Long Service Life : Amazon.co.uk: Computers & Accessories
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NVIDIA's GeForce GTS 450: Pushing Fermi In To The Mainstream