Epilogue
The Corsair RM1000x Shift ATX v3.1 achieves top overall performance, ranking second in the respective graphs among the units I chose for comparison. It has tight load regulation, especially on the minor rails, good ripple suppression, a stable 12V rail under transient loads, high efficiency on all load ranges, an extended hold-up time, low inrush currents, an efficient 5VSB rail, and low vampire power. Moreover, it operates silently.
On the other hand, there is room for improvement for its APFC converter, primarily at 230V, the minor rail’s transient response needs boosting and the most important of all, its protection features need better tuning. Although the over current protection at 12V and the over power protection are conservatively set, I still expect a greater difference between the normal and high operating temperature settings. On top of that, the minor rails have highly set OCP triggering points, with insignifican differences between normal and high temperatures. The PSU is stressed way more under high temperatures, so the protection features should be adjusted accordingly not to allow it to go as far as it goes under lower temperatures.
You will probably notice a high difference in my inrush current measurements. This is because I completely changed the methodology and the measuring equipment. I used to switch the PSU on and off via its power switch, which affected the respective measurements. I do it now using an AC source, set to supply power starting with a 90-degree phase.
All in all, the Corsair RM1000x Shift ATX v3.1 offers top performance and high build quality. With more careful settings for its protection features, it can be one of the best 1000W units available today.
Before investing in a new power supply, read my article on the Best ATX v3.x PSUs to compare all alternative PSU offerings. You help me a lot by using my affiliate links, which don’t increase the price of the product. I receive a commission from Amazon every time you do it, which can make a significant difference for me, especially now that I am working independently, exclusively for my media, rather than for someone else.
- Delivered full power at 46°C
- ATX v3.1 and PCIe CEM 5.1 compliant
- Cybenetics Platinum rated (Downgraded to Gold by Corsair)
- High efficiency on all load ranges
- High build quality
- Silent operation
- Good transient response at 12V
- Efficient 5VSB rail
- Low vampire power
- Extended hold-up time
- Tight enough load regulation
- Good ripple suppression
- Alternative Low Power Mode (ALPM) compatible
- 140mm Fluid Dynamic Bearing fan
- 12+2-pin PCIe connector set at 600W
- Protection features (OCP and OPP) need adjustments to be more effective
- Transient response could be better on the minor rails (normal loads)
- No fan failure protection
