Interconnects... speed or power?

For general integrated circuit logics, why are low voltage being used?
- First reason: to save power.
- It follows CMOS technology scaling. That is, shrinking sizes of transistor dimensions. Which means, more transistors can be fit into a chip. Which also means, chips can get smarter, and faster at the same time.

But, what about low voltage interconnects? What about on-chip wires??
- Yes, their size won't get smaller. In fact, they will get more complex and probably longer since you will now have much more things to connect to inside a chip, and not to mention the fact that they make chips a bit bigger nowadays?
- So, yes. It's not a good news for interconnects. Yes, low voltage will save power too in the case of interconnects, BUT due to the above circumstances, longer delays will occur... and higher noise interference?

So at least, we had identified two contradictive problems for interconnects: speed and power.

Naturally, if you just follow the technology scaling trend without doing any clever solutions to the interconnect, then these interconnects will get slower and more power consumptive.

Now, it all depends on what is it that you actually want? Do you want speed? Or are you more concerned with power?