GDDR4 (Graphics Double Data Rate 4)是一款显卡专用记忆体，由JEDEC制定。GDDR4基于DDR3，用来取代基于DDR2的GDDR3。[1][2]
GDDR4推出一年便被GDDR5取代了。只有ATi曾经推出采用GDDR4的显卡，其他厂商均由GDDR3直接跳到GDDR5。
技术
- 使用数据总线转位技术 (Data Bus Inversion)
- 预取由4位元增加到8位元 (跟DDR3相同)
参考文献
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