Replacement Power Supply

I dont notice the flicker since the swap, and the Solid Gear is a 320watt - vs the stock 200 watt.  So it is a bit more powerful - my main goal was to make sure it fit in the same spot as the old one. 

Technically, a higher amperage 12v rail will not cause the bed/extruder to heat up faster...thats not how a heater works. 

That being said, I think I need to add a load to the 5v rail to balance the power supply - it randomly shuts down and it appears to be a common problem with using an ATX style power supply.

A heater is a resistive load. The more current that is applied to it, the faster it will heat. I can confirm the higher wattage supply decreased my bed heating time by 7 minutes. It now only takes about 5 to reach 110.

I also have the same problem with my delta right now. The power supply is failing and if I try to heat the bed it will not go above 65 when at first it would go to 95 when installed. I plane to get a 75 amp server supply for it and not worry about it any more.

I probably could have been clear, an inadequate power supply would not be providing the necessary power (volts and amps). But in my case, my heated bed us 140 watt at 12volts. So as long as it is getting 12 volts and 12 amps - we are good. Supplying 12volts @ 24amps would not cause it to heat faster because the load will only draw the 12 amps that it needs.
As I said above, the under rated power supply would like be trying to balance itself and would lower the voltage (say to 11v) in order to supply the bed with enough amps.

I could still be wrong, I am basing this off of my electrical courses that I took when working in my mechanical engineering degree. So...I'll double check with an electrical engineer.

Awesome! Just do some testing and make sure it doesn't power off randomly. Apparently ATX PSU s like have have a balanced 12v and 5v line, it seems common for people to add a 1amp load to the 5v line in order to balance the system and avoid random shutdowns.

I have replaced mine with a 320 watt flex ATX supply I got at Microcenter. Looks like the original just higher wattage. it has all the outputs a PC would use like 3.3, 5 and 12. All I did was hooked up the 12 and left the 3.3 and 5 hanging. I have had no issue.

If you are having random shutdowns then something is overloading your supply. Maybe your heater cartridge is shorting against the brass heat block on certain moves or the wires are shorting together. Or maybe your bed is shorted and pulling too much current. I would see if you could get or borrow one of those clamp on style current meters and see what the current draw on that 12 volt line is while you are printing.

Maybe, I was actually trying to find the model I bought. With it mounted I cant see the label or specs anymore so I was unsure what it's wattage was. I know it was more than stock. In any case if it is shutting down, that is not normal and something is wrong in his machine. You could go with a 600 watt PC supply and still have the same issue or maybe even fire then. Something on his 12 volt rail is shorting or getting loaded way beyond the normal limit.

Do you have a link or a picture of the supply you are using? The one I used looked exactly like stock with exception. It had many more wires. All I did with mine was take one ground to the switch. Then the green to the switch.  I spliced the stock connectors to the appropriate lines and all was good. Now that I have moved to a Ramps it only uses 12 volts. So the connector that had 3.3 and 5 volts is now laying loose in the bottom connrcted to nothing. My power supply runs strong, never shuts down and throttles as it should based on load. Sounds to me like you are not using a flex ATX supply or you have something seriously wrong in your printers 12 volt wiring.

Thats the same one I bought. I have had no issues with it although after rechecking my connections I did wire the stock fan to the 5 volt side since it was a 5 volt fan. But thats the only load on the low side.