Seems like the price of these things just keeps on dropping.
With enhanced memory architecture that is able to handle 115GB a second, the XFX ATI Radeon HD 4870 is the only graphics card available with blazing fast GDDR5 memory. Featuring nearly one billion transistors and up to 800 stream processors, the high resolutions and fast frame rates that were once the sole domain of dual-card systems are now yours.
GPU Clock MHz - 750 MHz
Stream Processors - 800
Bus Type - PCI-E 2.0
Memory Interface Bus (bit) - 256
Memory Type - GDDR5
Memory Size (MB) - 512MB