Hexus compares the Corsair HX1000 and AKASA PowerMate V2 1kW PSUs. Systems get more and more power hungry, especially if you are trying to push them to the limits with the latest hardware components.

Quote from the review: "The inexorable rise in the parallel processing power of modern GPUs has led to increasing power-draw that's not wholly mitigated by consistent moves to smaller manufacturing processes. For example, the twin-GPU GeForce 9800 GX2 and Radeon HD 3870 X2 cards consume around 200W when running at full chat.
Granted, they're high-end SKUs that appeal to a limited market, but users can now install two and run four-GPU multi-rendering."
Read the full review on Hexus.