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Which rail is which?

PCBudgetSolutions
By PCBudgetSolutions
in Power Supplies
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So I have a 420W PSU that is in this build and it has 2 12v rails.  One is 19A and one is 18A.  I have a GTX 650 TI 2GB and an I7-920.  Should I run molex>6 pin to use the second rail for the GPU?

Specs: Core I7-2600K @ 4.5GHz @ 1.35V, 4x4GB Corsair Vengeance Black 1600MHz CL9, Cooler Master Evo 212, MSI Z77 Mpower Motherboard, Sapphire Radeon HD 7950 Vapor-X @ 1000/1400, Cooler Master HAF 932 Blue Edition w/ 3 Cougar Hydraulic Bearing 120MM fans (2 up top 1 in the bottom) replaced side panel with a window, and rear fan with a Cougar Hydraulic Bearing 140MM, Cooler Master GX 650 80+ Bronze PSU, Samsung DVD-RW, Samsung 840 Pro 128GB SSD, Seagate 750GB SATA III 7200RPM

 

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I think some power supplies have them labeled with different colors on the 12v wires. You should post which power supply you have, and maybe someone can help based off that.

System specs:  CPU: AMD Phenom II x3 705e unlocked to x4 overclocked to 2.8GHz   |   MB: ASUS M5A78L-M LX PLUS   |   Cooler: Hyper 212+   |   GPU: MSI GTX 560ti OC to 910Mhz   |   RAM: 8GB PNY DDR3 1333   |   HDDS: WD Caviar Blue 320GB, Hitachi 500GB HDD   |   PSU: Cooler Master Extreme Power Plus 500W   |   Peripherals: Microsoft wireless mouse, old mac keyboard, ASUS VS238H, Gateway FPD2275W, some speakers, Logitech Driving Force Pro

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It does have a 6 pin PCI-E on the PSU itself.  Would that be my best bet?

Specs: Core I7-2600K @ 4.5GHz @ 1.35V, 4x4GB Corsair Vengeance Black 1600MHz CL9, Cooler Master Evo 212, MSI Z77 Mpower Motherboard, Sapphire Radeon HD 7950 Vapor-X @ 1000/1400, Cooler Master HAF 932 Blue Edition w/ 3 Cougar Hydraulic Bearing 120MM fans (2 up top 1 in the bottom) replaced side panel with a window, and rear fan with a Cougar Hydraulic Bearing 140MM, Cooler Master GX 650 80+ Bronze PSU, Samsung DVD-RW, Samsung 840 Pro 128GB SSD, Seagate 750GB SATA III 7200RPM

 

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