TX750W belongs to the latest power supply series from Corsair, TX. It is the power supply with the highest wattage from Corsair today – rated at 50° C, by the way, which is great – and also the only one featuring four power connectors for video cards – even the 650 W model from TX series doesn’t have four connectors. Another technical feature of this new series is the use of a single high current +12 V rail instead of several virtual rails with lower currents – units from their HX series have three virtual rails, but models from their VX series also feature a single +12V rail. It doesn’t feature a modular cabling system like HX series, but it has a 140 mm fan, high efficiency and active PFC. Let’s take an in-depth look inside this power supply and see if it can truly deliver its rated power.
This power supply comes inside a bag and also comes with 10 cable holders for fastening the power supply cables and thus improving the airflow inside your computer.
As you can see on Figures 2 and 3 this unit uses a 140 mm fan on its bottom (the power supply is upside down on Figures 2 and 3) and a mesh on its rear side, where traditionally we have an 80 mm fan. This cooling solution provides a better airflow and lower noise level, since bigger fans can rotate at a lower speed in to generate the same airflow as smaller fans. It is important to note that the 650 W model from TX series uses a smaller 120 mm fan.
It also has the two standard features, active PFC and high efficiency (80%).
The higher the efficiency the better – an 80% efficiency means that 80% of the power pulled from the power grid will be converted in power on the power supply outputs and only 20% will be wasted. This translates into less consumption from the power grid (as less power needs to be pulled in order to generate the same amount of power on its outputs), meaning lower electricity bills – compare to below 70% on regular power supplies.
Active PFC (Power Factor Correction), on the other hand, provides a better usage of the power grid and allows this power supply to be comply with the European law, making Corsair able to sell it in that continent (you can read more about PFC on our Power Supply Tutorial). As you can see in Figure 2 this power supply doesn’t have an 110V/220V switch, feature available on power supplies with active PFC.
This power supply comes with seven peripheral power cables: four auxiliary power cables for video cards with 6/8-pin connectors (see Figure 4), two cables containing four standard peripheral power connectors and one floppy disk drive power connector each and two cables containing four SATA power connectors each.
We have one constructive criticism regarding the peripheral power cables though. Instead of using a long cable with a lot of connectors, we think the manufacturer should have added more cables with fewer connectors each – for example, three cables with three SATA connectors each instead of two cables with four SATA connectors. In our opinion this provides a better power distribution.
As we mentioned, all video card power connectors can be transformed into an 8-pin connectors, meaning that with this power supply you can install all kinds of high-end video cards.
The plastic sleeving used by the cables don’t come from inside the power supply (see Figure 3), which is something we don’t like for esthetic reasons.
This power supply has one EPS12V connector that can be transformed in two ATX12V connectors and the main power supply connector can be used both on older 20-pin motherboards and on current 24-pin motherboards.
All wires used on this power supply are 18 AWG, but for this power range we think we should see at least some thicker wires (i.e., 16 AWG) around. Cheap power supplies use 20 AWG wires or even 22 AWG, which are thinner.
Even though Corsair paid to have its own UL number, this power supply is really manufactured by CWT, as you can see in Figure 5.
- 1. Introduction
- 2. A Look Inside The TX750W
- 3. Transient Filtering Stage
- 4. Primary Analysis
- 5. Secondary Analysis
- 6. Power Distribution
- 7. Load Tests
- 8. Overload Tests
- 9. Main Specifications
- 10. Conclusions