Kougar | 6th April 2009 06:09 | Quote:
You're free to call us conservative, but when a 700W-pulling system works for two years with two OCZ PP&C CrossFire 750W PSUs, we call that a success.
| This by itself is proof of the opposite. By his reasoning those 750W rated PSUs are rated for 600-640W, and he would be overloading them! The efficiency isn't subtracted from the official wattage rating, it is multiplied by the rating and then subtracted from the power draw from the wall to get actual system power usage.
It also must be taken into consideration when looking at readings from a wall power meter... 750W draw from the wall means the system is drawing 600W to function assuming a flat 80% AC/DC conversion efficiency (which is a huge oversimplification, but for the sake of an example... ) Quote:
The machine was consisted out of C2QX6700, 4GB DDR2-800 RAM, nVidia GeForce 9600GSO and four WD Black 500GB drives in RAID5 array. Simple, right? Well, it wasn't.
| I find it unlikely this setup could pull 700 or greater from the wall... the voltages and overclocks required would need to be dangerously high. Considering it required a Q6600, 8800GTS, 4 HDDs in RAID 10, extra HDD, sound card, fan controller, MCP655 pump, ~9 120mm case fans and some extreme CPU/GPU overclocking for me to reach >700W power draw from the wall...
PSUs are rated for a set output. This is not like hard drives where the GB rating is overstated. Some PSU manufacturers still cheat and overstate their PSU rating / capability. If he wants to convince me of this I'd need to hear an electrical engineer from one of these PSU companies confirming this. Just as he claims it goes against his experience, it goes against all the experience I have and what information I have studied regarding power supplies. :) |