GDDR4 (Graphics Double Data Rate 4)是一款顯示卡專用記憶體，由JEDEC制定。GDDR4基於DDR3，用來取代基於DDR2的GDDR3。[1][2]
GDDR4推出一年便被GDDR5取代了。只有ATi曾經推出採用GDDR4的顯示卡，其他廠商均由GDDR3直接跳到GDDR5。
技術
- 使用數據總線轉位技術 (Data Bus Inversion)
- 預取由4位元增加到8位元 (跟DDR3相同)
參考文獻
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