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OPA227增益带宽积问题

Other Parts Discussed in Thread: OPA134, OPA227, OPA277

用TINA自带的例程仿真,输入信号10mV 500K正弦波(摆率足够),输出增益达不到要求(2),看交流特性曲线感觉也达不到运放的8M GBW。如图:

但是用GBW同样是8M的OPA134就能够达到要求,莫名其妙,如图:

 

按理说电路是一样的,不应该有这么大的区别,难道是还有其他的什么参数导致这种结果吗?