Any disadvantages to adding more RAM?

[AmigaMance]

Hi.
 I have a BPPC with a 128MB SIMM mounted to it. This is more than enough for me on AmigaOS, but not for certain MorphOS programs such as OWB and battle of wesnoth. So, i'm considering to add another 128MB SIMM to the second slot.
 Are there any disadvantages to this? Like increased memory fragmentation, slower memory access (both SIMMs will be identical) or anything?

[AmigaMance]

Thanks for the replies.
 Well, the SIMM that i'm using currently, doesn't feel hot to the touch at all. Thus, overheating shouldn't be a problem for me. If the only disadvantage to this, is a small increase in power consumption then i will go for it.