Speaking as an electrical engineer, you can do anything you want. The real question is if it'll have the effect you want or not. Increasing current on a signal will, of course, blow it up.

Now, as far as increasing voltage goes? Voltage increases are generally undesirable because electronics are getting smaller. Now, we need to talk about how electricity works. In short, it's water. Voltage is pressure, current is flow rate, resistance is pipe diameter. Energy is volume ('gallons'), power is volume over time ('gallons per minute').

So, we have an electrical flow (amperage) with a certain amount of pressure (voltage). That tells us how wide the pipe (resistance) is, (Ohm's law, V=i*R).

You know how wires get hot with high power loads? That's called resistive heating. Power of resistance heating = current x current x resistance (or flow x flow x pipe diameter). This means that, when it comes to managing heat in electronics, decreasing amperage is MUCH more important than decreasing resistance.

Last, increasing voltage is increasing pressure, but the whole goal of electronics advancement is to reduce the size of electronics to smaller and smaller almost atom-scale constructs. But if you put highly pressurized electrons into a thin plastic tube, well, it's almost like making a pipe out of a single layer of plastic wrap and then pressurizing it. The pipe bursts.

So, no. You can't increase voltage or current to handle memory issues.

The way to think of a memory controller is like the loading dock of a warehouse. Each truck is 64 bits wide, the loading docks are 384 bits wide, that means they can dock 6 trucks at once.

Now, it's possible to have trucks with two trailers instead of one, but that adds complications to the docking procedure - is the docking yard wide enough for them to maneuver? What about using trains to dock instead? (LRDIMM, slight latency penalty, needs more power, but the docking yard has less logistics to do in exchange for the train handling it).

With GPU memory? Adding latency fucks things royally. So, a 384-bit wide bus means that it sends/receives 384 bits every time it clocks (the clock speed of the memory). RAM modules tend to have a bit width (I.E. 64 bits). Theoretically you could get more RAM modules with shorter bit widths, but this has diminishing returns. If the memory controller runs at 2.0 GHz and is 384 bits wide, that gives us 2.0x10E9x384/(1024x1024x1024)=715.26 gigabytes/second maximum theoretical bandwidth. Practical is always less than maximum theoretical, but point being with a 64 bit bus width each RAM module gets a 119 gigabyte slice of that. If we half the bus width, each memory module gets a smaller slice, and I'll admit my knowledge on how data is interleaved with memory controllers is lacking, but we run into the concept of a word at some point and have to deal with the ramifications of what happens when your memory bus width is smaller than a single word (either you have to wait multiple clocks to write a word to memory, or you interleave the word).

At high speeds, you have to keep everything synced up, calibrated+trained video or article that should explain some of what calibration+training looks like, with the article being from Altium Designer which I really wish I could afford. Anyway, it all has to be routed on the PCB which requires talented engineer time. After which it has to be verified and tested to make sure signal integrity is like what the simulations say it will be.

So, no. Even in this, I assume that memory chips can be connected to arbitrary bus widths. This is an extreme assumption roughly akin to assuming all dogs are friendly and putting your face in their face. I've never read a spec sheet/built something using GDDR of any type, so I don't know if it can be done or not. If it can be done, part of the reason it isn't is that memory is expensive. I've not priced it, yet, but it looks like $51.60 for 16Gb (2GB) of GDDR7 off Aliexpress. Meaning 32GB of GDDR7 is $825.60 retail if the random seller I found was reputable. Assuming Intel pays half that price, it's not an insignificant amount, and would put their cost into a bracket where there are other, better options.