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QDR-SDRAM - Quincunx.

QDR-SDRAM - Although not available at the time of writing, QDR is Quad- Data-Rate SDRAM. It handles two bits on the upside of a clock and two bits on the downside of a clock, for a total of four bits-per-clock.

Quincunx - Nvidia's custom anti-aliasing technique that offers performance closer to 2x AA with visual quality closer to 4x AA. The effect is calculated using four surrounding pixels in a "quincunx" pattern.