IBM P6 570 内存扩容的话，注意事项

P6 570的机器，配置了2个机头，每个机头里面2个CPU板子，每个cpu里面插入了8根1G的内存条，现在内存不足，需要扩容内存。有如下问题，不明白，还请专家解答，谢谢！

1.Cod 的话内存增加，是否需要额外购买license激活？

2.1G和 2G的内存条频率一样，是否可以混插，文档上说是可以 mixed on the same POWER6 processor card。实际有干过的吗？4个CPU板子，只扩其中2个CPU的板子内存是否可以？两个机头里面各扩一个CPU板子，还是必须在同一个机头里面2个CPU板子全部扩内存？还是2个机头4个CPU板子都必须扩内存。

这个扩内存有没有原则，考虑那方面的问题？

3.When configuring the memory in a 570, placing 2 memory features (8 DIMMs) on a single

processor card will provide the maximum available memory bandwidth. Adding the third

memory feature will provide additional memory capacity but will not increase memory

bandwidth. System performance that is dependent on memory bandwidth can be improved by

purchasing two smaller features per processor card as opposed to one large feature per

processor card. To achieve this, when placing an order, ensure the order has 2X memory

features for every processor card feature on the order.

貌似两组内存条，才能提供最高的性能，跟内存带宽有关系，加第三组也不提高。难道架构就这样么？