The RM750X is part of the new RMx series of 80 Plus Gold certified power supply units by Corsair which also includes models with 550/650/850/1000W power outputs. The RM750X also features a fully modular design ("future proof" since you can just change the 24pin mainboard power connector down the road if it ever changes), single powerful 62.5A +12v rail capable of delivering 100% of the units total power (this unit has a peak output of 925W), rifle bearing 135mm fan with zero RPM technology (thermal sensor keeps the fan from spinning until temperature builds up inside the enclosure), high-quality Japanese capacitors (rated for use up to 105 degrees Celsius), flat modular cables (increased airflow and easier routing), several electrical protections (Over-voltage protection, under-voltage protection, short circuit protection, over power protection, and over temperature protection) and is covered by an impressive 10 year warranty.
The main differences between the more expensive RMi models and the RMx versions are seen in the latters' lack of a digital interface board and fan test button (which can come very handy on a semipassive PSU). Additionally, the RMx models use a different fan, with a Rifle bearing, which is of lower quality than what the RMi models use. These use fans with fluid dynamic bearing (FDB), which is considered the best bearing available today. Another significant difference is the single +12V rail that the RMx units feature. In the RMi PSUs, the user can choose between single and multi +12V modes through the Corsair Link software.
A very interesting feature of the RMx units comes in the modular cables they use, which are similar to those of the RMi models and which Corsair describes as Type 4 cables. Polymer capacitors are installed on the +12V, 5V and 3.3V wires of the ATX cable and on the +12V wires of the EPS and PCIe cables, providing extra ripple filtering. On top of that, the ATX cable plugs into the PSU's modular interface through 28 pins instead of the usual 24 pins, with the extra four pins acting as sense wires. The use of sense wires allows for a very tight load regulation, Corsair claims, which is a key performance feature for any high-end PSU.
The Corsair RM750x power supply is a rather simple looking, inoffensive, yet attractively finished power supply. The RM 750x branding is visible on the side panels. It measures 150 mm (W) x 86 mm (H) x 180 mm (L).
Paint quality is high, and it passed our screwdriver test. This involves running the head of a Philips head driver down the side of the chassis with light to medium force.
One side of the power supply is vented to help with heat dissipation and air flow. A power button and connector are positioned at the side. Corsair place a sticker over the cable connector to alert the user that the fan is not likely to spin at idle to moderate loads.
On the bottom of the unit is a 135 mm rifle bearing fan, covered by a fan grill of course. The RMx series power supplies use a custom NR135L fan that is designed for high static pressure in order to efficiently push air through the PSU components. The rifled fan bearing also provides a longer life quieter operation than most ball-bearing fans. The fan also has a Zero RPM mode, which means when the power supply is at a low-load or idle state the fan will not even spin up!
– Made with quality components
– Quiet fan with Zero RPM mode
– Good overall performance
– 7 year warranty
– Fully modular
– Does not support Corsair link
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