推荐回答（3个）
第一行字是内存芯片生产商和产地
LGS〔LG Semicon〕
LGs如今已被HY兼并，市面上LGs的内存芯片也很常见。
LGS SDRAM内存芯片编号格式为：GM72V ab cd e 1 f g T hi 其中GM代表LGS的产品；72代表SDRAM；ab代表容量(16=16Mbits，66=64Mbits)；cd表示数据位宽(一般为4、8、16 等)；e代表Bank（2=2个Bank，4=4个Bank）；f表示内核版本，至少已排到E；g代表功耗（L=低功耗，空白=普通）；T代表封装（T= 常见的TSOPⅡ封装，I=BLP封装）；hi代表速度（7.5=7.5n〔133MHz〕，8=8ns〔125MHz〕，7K=10ns〔PC-100 CL2或3〕 ，7J=10ns〔100MHz〕，10K=10ns〔100MHz〕，12=12ns〔83MHz〕，15=15ns〔66MHz〕）。
例如GM72V661641CT7K，表示LGs SDRAM，64Mbit，16位输出，4个Bank，7K速度即PC-100、CL=3。 LGS编号后缀中，7.5是PC133内存；8是真正的8ns PC 100内存，速度快于7K/7J；7K和7J属于PC 100的SDRAM，两者主要区别是第三个反应速度的参数上，7K比7J的要快，上133MHz时7K比7J更稳定；10K属于非PC100规格的，速度极慢，由于与7J/7K外型相似，不少拦枝奸商把它们冒充7J/7K的来卖。
备注：
第1字段由GM组成，代表LGs公司的产品。
第2字段代表产品类型，72代表SDRAM。
第3字段代表电压，V代表3V。
第4字段代表内存单位容量和刷新单位，16代表16M(4K刷新)；17代表16M(2K刷新)；28代表128M(4K刷新)；64代表64M(16K刷新)；65代表64M(8K刷新)；66代表64M(4K刷新)。
第5字段代表数据带宽，4代表4位；8代表8位；16代表16位；32代表32位。
第6字段代表芯片组成，1代表1BANK；2代表2BANK；4代表4BANK；8代表8BANK。
第7字段代表电气接口，1代表LVTTL。
第8字段代高或表芯片的修正版本，A代表第1版；简念敏B代表第2版，依此类推。
第9字段代表功耗，空白代表普通；L代表低功耗。
第10字段代表封装方式，T代表TSOP；R代表TSOPⅡ；I代表BLP；S代表STACK。
第11字段代表内存的速度，6代表6ns(166MHz)；65代表6.5ns(153MHz)；7代表7ns(143MHz)；75代表7.5ns (133MHz)；8代表8ns(125MHz)；7K代表10ns(PC100 @222)；7J代表10ns(PC100@322)；10K代表10ns(PC66)；10J代表10ns(PC66)；12代表12ns (83MHz)；15代表15ns(66MHz)。
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