Published: August 27, 2009 | Source: Corsair | Author: James Napier

Corsair HX750w (750w) ATX PSU

Appearance & Internals

Starting off with the externals of the HX750w, everything looks pretty much identical to the HX850w barring the model number on the stickers. Both units have exactly the same dimensions, the same matte black powdercoat finish and the same modular connector backplane layout.

However one easily overlooked difference between the two is the number of hard-wired connectors on the unit. Whereas the HX850w has 2x PCI-E connectors along with the usual ATX and EPS12v connectors, the HX750w is void of any hard-wired PCI-E connectors.This brings the total number of hard-wired connectors down to 4 for the HX750w which is probably about right given the rated power output of the unit.

One positive way to look at the removal of these hard-wired connectors is in the name of vanity. If like me, you’d much rather see Corsair’s sexy flat style modular connectors routing around your PC rather than the sleeved versions, then the HX750w would be the natural choice as you can run two high-end GPU’s from the four modular PCI-E cables without needing to hide away the remaining two hard-wired cables.

Moving on to the internals, everything at first glance appears to be identical to that of the HX850w. Three rather thin heatsinks run in parallel along the length of the unit and all cables going to the modular backplane and other areas of the PSU are extremely tidy. Two DC-DC daughter boards with solid-state capacitors can be seen over on the low voltage side of the unit which, as mentioned in our previous HX850w review, are responsible for the stepping down of the PSU’s primary +12v output down to +3.3v and +5v for the other rails.

Going in for a closer look, we can see that two Nippon Chemicon 420v / 330uF / 105Â°C capacitors and two custom-wound Viking Controls transformers have been used over on the primary (high-voltage) side along with a collection of Nippon Chemicon 16v / 2200uF / 105Â°C KZE capacitors over on the secondary side. This is exactly the same configuration as that of the HX850w, leaving us none the wiser as to what the physical differences between the two models are.

In a last ditch effort to try and spot any minor changes between the HX750w and HX850w units a negative image of the HX850w was placed under a 50% transparent image of the HX750w. Any differences between the two units show up in bright blue, orange or white shades. Once again there is very little to separate the two units with the only noticeable discrepancy being in the size of the inductor on the secondary side, which shouldn’t really have any effect on the output power of the unit.

So with virtually no visible differences between the two PSU’s other than a couple of missing PCI-E connectors, let’s see if any differences present themselves during the testing over on the next page…