I'm building a new Core i7 system and planning to run two GTX 280s. Everything I've read suggests that 720W is hugely adequate for such a system, but I'm a little worried because of Enermax's literature.
Two GTX 280s will require two 8 pin PCI-E plugs and two 6 pin PCI-E plugs. While the EIN720AWT has three 12v rails, it has only one 8 pin and two 6 pin cables. Now, in it's bag of modular cables, it came with one which takes two 12v peripheral plugs and turns them into an 8 pin PCI-E cable, straight out the back of the PSU, without dimestore cable adapter trickery. That would solve the problem, but for the fact that the manual specifically forbids the use of modular PCI-E cables in "peripheral" plugs, as well as using peripheral cables in PCI-E plugs.
So it's forbidding me to use the modular cable adapter that came with the PSU!
It may be completely wrong, but what I've worked out is (Giving Jonnyguru more weight than the manual):
12v rail 1: PCI-E 6 pin (three 12v peripheral plugs available)
12v rail 2: PCI-E 6 pin, CPU 4+4 (three 12v peripheral plugs available)
12v rail 3: PCI-E 8 pin, 12v lines in ATX connector (zero 12v peripheral plugs available)
So assuming I use the 8 pin and 6 pin from 12v rail 3 for one card, and the 6 pin from 12v rail 1 for the other card, where should I plug in the second 8 pin adapter? The wattage will easily support two heavy usage cards and a beefy CPU, but should I heed the manual's warning anyway? Is it unwise to span multiple 12v rails for one video card?
Here's the Jonnyguru article on this particular PSU, but I can see already that the literature he had is outdated, mine gives more information than his does.
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=2
And the PSU's manual
http://www.enermaxusa.com/support/download/manual_infiniti.pdf
At the top of page 9 is the diagram of the plugs on the back of the PSU. One 8 pin cable is fixed and not shown. The two "PCI-E ONLY" plugs are used for 6 pin cables. If you look on page 10, you can see the adapter I'm hesitant to use, EMC009. It's even got black ends on the PSU side of the cable, like it's meant to be used in the peripheral plugs the manual strictly forbids use of.
Two GTX 280s will require two 8 pin PCI-E plugs and two 6 pin PCI-E plugs. While the EIN720AWT has three 12v rails, it has only one 8 pin and two 6 pin cables. Now, in it's bag of modular cables, it came with one which takes two 12v peripheral plugs and turns them into an 8 pin PCI-E cable, straight out the back of the PSU, without dimestore cable adapter trickery. That would solve the problem, but for the fact that the manual specifically forbids the use of modular PCI-E cables in "peripheral" plugs, as well as using peripheral cables in PCI-E plugs.
So it's forbidding me to use the modular cable adapter that came with the PSU!
It may be completely wrong, but what I've worked out is (Giving Jonnyguru more weight than the manual):
12v rail 1: PCI-E 6 pin (three 12v peripheral plugs available)
12v rail 2: PCI-E 6 pin, CPU 4+4 (three 12v peripheral plugs available)
12v rail 3: PCI-E 8 pin, 12v lines in ATX connector (zero 12v peripheral plugs available)
So assuming I use the 8 pin and 6 pin from 12v rail 3 for one card, and the 6 pin from 12v rail 1 for the other card, where should I plug in the second 8 pin adapter? The wattage will easily support two heavy usage cards and a beefy CPU, but should I heed the manual's warning anyway? Is it unwise to span multiple 12v rails for one video card?
Here's the Jonnyguru article on this particular PSU, but I can see already that the literature he had is outdated, mine gives more information than his does.
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=2
And the PSU's manual
http://www.enermaxusa.com/support/download/manual_infiniti.pdf
At the top of page 9 is the diagram of the plugs on the back of the PSU. One 8 pin cable is fixed and not shown. The two "PCI-E ONLY" plugs are used for 6 pin cables. If you look on page 10, you can see the adapter I'm hesitant to use, EMC009. It's even got black ends on the PSU side of the cable, like it's meant to be used in the peripheral plugs the manual strictly forbids use of.
Last edited: