ASUS U-75HA 750w ATX PSU
Internal Components
Truth be told, there are very few ‘manufacturers’ out there who actually make their own PSU’s. This is mainly because PSU manufacture isn’t something that you can get good at over night, and the tools and machinery that go into producing a PSU would be a totally uneconomical investment for even a company as large as ASUS. For this reason, ASUS along with many other well know PSU brands use what is known as an OEM (Original Equipment Manufacturer) to build their PSU’s for them.
However, this certainly doesn’t mean that ASUS hasn’t been involved in the specification and design of the unit. Far from it. Aside from selecting the actual OEM to build the units there are many other ways in which ASUS can make their PSU different from the generic ones that the OEM may build. This starts with things like how many cables are going to be included, what colour sleeving (if any) is it going to have, how much power is going to go to each of the PSU’s rails and what kind of fan is going to be used..the list is really endless.
Therefore, even though we know that ASUSÂ have chosen DELTA as their OEM, there’s still plenty of reasons to poke around inside the unit and find out just what makes it tick!
Starting off with the basics, the internal layout of the U-75HA is quite tidy with all cables neatly zip-tied together to keep them well out the way of fan blades. Two black aluminium heatsinks attached to the mosfets span the length of the unit, and finned areas of the heatsink increase the surface area making better use of the 135mm fan that would normally be positioned directly above.
In the image top-right we can see the three main transformers of the PSU that perform the brunt of the voltage step-down to what is used inside the average PC. While the largest of the three is undoubtedly responsible for the 12v rails and the mid-sized one for the 5v and 3.3v rails, we’re not entirely sure what role the smallest one plays.
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Cable Configuration
The U-75HA has a total of nine cables extending from the unit that branch out into 6xSATA, 6xMolex, 4xPCI-E, 1xATX, 1xEPS and 1xP4-12v connectors. This is about average for a PSU of this wattage although both the PCP&C Silencer 750w and the Be-Quiet Dark Power Pro 650w beat it by at least two additional connectors.
Each and every cable on the unit is sleeved in a black mesh finished off black heatshrink at the ends. Interestingly ASUS have decided not to carry the sleeving right the way into the PSU, instead stopping just a couple of centimetres short. Admittedly this doesn’t exactly do much for the looks of the unit, but it does enable each of the nine protruding cables to have a much greater bend radius which could prove helpful if the PSU were to be installed in a confined space.
‘Easy-plug’ connectors have also been used on each of the six molex plugs to make removal from devices much easier.
Rather than having four PCI-E cables extending from the PSU for each of the four PCI-E plugs, ASUSÂ have decided to ‘piggy-back’ two plugs off a single main cable. This reduces cable clutter when running Crossfire/SLI with high-powered graphics cards but does mean that if you only have a single card with a single PCI-E connector, you’ll be left with a flappy bit of wire to try and tuck away. All four of the PCI-E connectors are capable of being converted into either 6-Pin or 8-Pin to suit all graphics cards.
Legacy connectors haven’t been completely ditched however, with the unit providing a separate cable for low-end motherboards (mostly mATX) that still use the 4-Pin ‘P4-12v’ connector.
