Seasonic X-750 power supply supports over voltage, over power and short circuit
protection in order to protect you, the power supply and the PC system from
damage. The X-750 is designed to operate in temperatures between
0-50 degrees Celsius and in relative humidity between 20-80%. Removing the top
cover voids the warranty. The 120mm Sanyo 12V PWM fan is detachable and can be
replaced quite easily if its bearings eventually dry up and the impeller
seizes. The PSU fuse is not user replaceable.
The first thing that's immediately obvious upon opening
Seasonic's 80 Plus Gold rated X-750 power supply is the almost total lack of internal wiring.
This puppy is just cleanly laid out, with plenty of space between components
for good airflow. The circuit boards are all dual layer PCB and Seasonic are using solid
state conductive polymer aluminum capacitors (silver with blue marking) and Japanese made 105C
rated electrolytic caps for the power filter (larger, brown wrapping).
In the motherboard world, capacitor reliability has become a worrisome issue
for many users. A couple years back the whole leaking and exploding electrolytic capacitor issue wreaked havoc, and
continues to this day to show its bulging, bursting, electrolyte leaking face on
older motherboards. If you've ever had weird computer instability problems all
of sudden, odds are good it's a burst
capacitor. It's nice to see these types of
capacitors making their way into power supplies.
Another interesting innovation with the X-750 is this
little circuit board pictured above. It's the DC-to-DC converter - basically the
circuit that takes the main DC supply and breaks it off to the different voltage levels
required by the various power cables that hook up to
the motherboard (if I've got it right). The black components you see
here are MOSFETs, and they form part of the power supply voltage regulator.
In previous modular power supplies PCSTATS has tested,
the only function of this board was to break out the cable bundle from the main power supply circuit
into the modular cable connectors. Seasonic have clearly engineered this PSU
from the ground up; for rather than an after-thought add-on, the modular cable
connector daughtercard (pictured above) is fully integrated into the whole power supply design.
A good rule of thumb for spotting a well made power
supply? An RF shielded main 120V power socket (pictured at upper left) and
RF chokes (round things with copper wire wrapped around them). Power load tests are up