First - Not sure if low +12V would cause a low E at CPU (effect ??) or what effect the Low E at GPU has.
2nd, possibly more important is the possibility of damaging CPU/MB/GPU
(a) it advertises 2 20A 12 V rails BUT that is note totally true. It also depends on how much current you are drawing on the +3.3 and the +5V
Advertised. 3.3 V @ 25 A=82Watts, 5V @ 30 A = 150 Watts, +12V @40A (Total) = 480 W. 82 + 150 +480 = 712W BUT it is only a 600 WATT rated PSU NOTE - two reviews indicated a weak 12V rail
(b) When (not if) it drops lower you may be asking "did My PSU damage the _____"
These are some of the quotes I found on the internet
Quote (JohnnyGURU)
"I would say that this is a unit to stay away from. I've seen 500W power supplies with better specs than this."
Quote (Xsreviews review)
"In terms of stability you can see that the 3.3v and 5v rails are fantastic. Unfortunately there is a .2 jump in the 12v rails between idle and load which is quite large. It also places the load voltage quite a way off its 12v target. " 12V idle was 11.9, load was 11.7V Yours is even less.
Quote (Testseck)
"Unfortunately this PSU falls down in the testing section of our review. Although it did manage to run all tests without crashing, its 12v was just far too loose and unstable to give this a top score. It does have some redeeming features, like fantasti..."
Added
I would download CPUID's harware monitor. Run it, then run your games (ie crysis untill you get studdering. Exit game. Then look at Min/Max values for +12V. You may find that you are dropping even lower than you think