I would also like to bring up this statement to attention (also on page 3
12V1 supplies 12V to all the other components that require it. This can lead to a problem with high power gaming systems that utilize two high power video cards in SLI or Crossfire mode.
This statement might be a bit misleading in that it infers all PSUs (2 12V lines) with such a configuration could cause problems with SLI or similar system setups (Antec's 2.0s follows the 12V2 powers CPU only configuration I believe and is SLI certified), yet alot of PSUs on nVidia's SLI certified list have two 12V lines.
Perhaps clarification needs to be added in this instance?
Your "clarification" makes no sense to me. I agree, it does imply <semantic note: The proper word is imply, not infer. I infer a conclusion from what is implied, not the other way around.</semantics> that PSUs that place all SLI load on the +12V1 line could have problems. This is in fact the case (at least in PSUs that follow ATX12V 2.x, which is really all we can say) — if the SLI load somehow manages to rise above 240VA, it becomes a safety hazard. Note that it is very difficult
to draw this kind of power. This is true whether or not a PSU is certified. I will admit up front that I don't know what nVidia does for certification testing, but I don't think it's relevant. Certification testing cannot guarantee
that SLI will work because SLI isn't the only load on the system; the load on the +12V lines is determined by the system as a whole. If you happen to draw a lot of power from the +12V1 line — wherever the power is needed and how it is split up — you risk overloading the line.
That said, the actual possibility of problems from this configuration is extremely low as long as the PSU is rated honestly. I can only guess at the kind of system that would actually gobble 20A from a single line.