yea i have a bunch of rigs man, i just listed my most expensive haha, i really like the assassin board. I still have my UD7, its just sitting here because i don't have a monitor for it, and i have everything setup on this computer. Its a good board, but teh M4E is too. Quality wise they are very similar, the M4E actually has a very high quality VRm, but the one of the UD7 and the M4E are not comparable becuase they use titally different method with each having its high points.
The M4E uses a chil digital PWM the GB uses a intersil analogue PWM
The difference is that the Chil uses a bunch of analogue to digital and digital to analogue converters, and the intersil has to use a seperate chip for LLC and phase control other than switching, the Chil has its own firmware and can be programmed and controlled through bios, the intersil is all hardware.
The M4E uses (high side and low side) MOSFETs and a separate driver (canpack package which are very high quality, probably the highest quality standalone FETs) per phase, each fet can switch at 1mhz, and can put out 30-40amps.
The UD7 uses Driver MOSFETs, which are integrated MOSFETs and Drivers into one IC, this reduces trace length and motherboard real estate. It also reduces driver signal length which is very important, each of the internal MOSFETs can switch at 1mhz, and putout 35amps per phase.
The UD7 uses ferrite core chokes and so does the M4E.
They both use electrolytic aluminum sold capacitors, and the M4E uses a lot more bulk capacitance.
Now the UD7 has 24 phases and the M4E actually has 16, even though most people only see 8. I count phases by the amount of driver MOSFETs or dedicated pairs of highside and low side MOSFETs, which makes the M4E have 16 phases because of 16 pairs, 2 pairs per choke and channel. The UD7 uses 4 Driver MOSFETs and 4 chokes per channel/phase from the PWM.
Mobo power supplies are extremely complex now a days, you have many variables such as transient response balanced with bulk capacitance. The more capacitors =more bulk capacitance which comes with its own resistance, and when you have more resistance you have a lower transient response. Switching frequency is directly related to transient response, but transient response isn't the first priority, you want to balance efficiency with transient response, with ESR(capacitor resistance). Idly you want high efficiency, low ripple, and good transient response. but the voltages we see through CPU-Z all have to do with LLC and how well it is tweaked.
The reason you see so little capacitors on the UD7 is because they have so many phases and so many chokes, which brings it higher efficiency and lower temps.
The M4E has many more capacitors and less phases with less chokes.
in the end transient response is probably very close on both power supplies(VRM) with voltage regulation being all in the PWM, and both use top notch PWMs, of course i think the volterra on the evga classified x58 is the best digital pwm. intersil makes the best analogue pwms, and digital right now the best is chil because they are the only with VRD12 certification for digital and intersil with VRD12 for analogue, and the truth is both give the same voltage accuracy and can implement the same voltage regulation. The funny part is that they do it the same way, its just one has more features and is easier to implement, while the other is a bit harder to implement, but has more options. The difference between digital and analogue PWMs is so small, both are actually digital because the word "phase" means digital because its not just on and off its tiny bits pulsating.
That is just skimming the top of the subject, but to be very honest they didn't teak LLC as well as they should have on the UD7. That should change with B3 as a simple BIOS update can change that, i have seen it too and messed with it.