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Question about 12v rails

post #1 of 5
Thread Starter 
I'm considering upgrading from my 5770 to a gtx470. I'm fairly certain my psu will be able to power the card enough, I'm just not sure how to connect it. I have one 6-pin from the psu, and the other 6-pin psu connection will be blocked by the 240 rad I'm about to bottom mount. My solution will be to go molex to 6-pin for the other connector.

I have two adapters, one that takes a single molex to 6-pin and one that splits the 6-pin between two molex connectors. My psu has two 12v rails, 25 amps each or 38 amps together. It makes logical sense to me that each 6-pin plug for the gpu should be on its own 12v rail (I know very little about psu's). Which adapter should I use? I would think the single molex to 6-pin would be best if I could know for sure that the other one coming from the psu was on the other rail.
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CPUMotherboardGraphicsRAM
AMD 955BE Gigabyte GA-770TA-UD3 Asus GTX560ti 12GB DDR3 1333 CL7 
Hard DriveHard DriveOptical DriveCooling
Spinpoint F3 750GB Seagate 1TB None Custom loop 
OSMonitorMonitorKeyboard
W7 Ultimate x64 Asus ML249H Asus VE228H Alienware TactX 
PowerCaseMouseMouse Pad
OCZ 550W Antec 902 Alienware TactX Razer Sphex 
AudioAudio
E-MU 0404 USB Ultrasone DJ1 Pro Headphones 
CPUCPUMotherboardGraphics
Xeon E5405 Xeon E5405 SuperMicro X7DA3 ATI X1800 
RAMHard DriveCoolingCooling
16GB DDR2 FB-DIMM Various Hyper 101 Hyper 101 
OSMonitorPowerCase
ESXi 5.0 Headless Antec NEO ECO 620W Rosewill RSV-L4000 
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None None HP P400 IPMI Card 
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post #2 of 5
I don't think running a single molex to PCIe is a great idea regardless of how the rails are distributed. Id use the dual molex adapter or find a way to get around the radiator and use the modular PCIe cable.
 
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Corsair Performance Pro 256GB  Western Digital Elements 2TB Samsung F4 2TB EK Supremacy  
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EK-CoolStream XTX 360 (X2) D5 w/ EK Top XSPC Photon 270 Tube Reservoir EK Compression Fittings 
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Yate Loon Medium (x13) Windows 10 Pro x64 Dell UltraSharp U2715H  Corsair Strafe RGB w/ MX Cherry Silent 
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post #3 of 5
Your unit is a mediocre 500w unit.

You should upgrade that PSU before you put that GTX 470 in it.
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CPUMotherboardGraphicsRAM
Core i5 3570K  Biostar TZ774XE Power Color AX5770 1GB 4x4GB 1866Mhz 9-10-9-27-2T 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F3 1TB Samsung Spinpoint F3 1TB Western Digital Green 2TB Samsung Spinpoint M4 500GB 
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post #4 of 5
Thread Starter 
Its actually a mediocre 550w unit, and yes I realize that I should upgrade, there's no denying that. However, I just spend a decent amount of money on watercooling parts and case modding supplies, so that's not going to happen until I can budget it. I would very much appreciate input on my original question though.
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CPUMotherboardGraphicsRAM
AMD 955BE Gigabyte GA-770TA-UD3 Asus GTX560ti 12GB DDR3 1333 CL7 
Hard DriveHard DriveOptical DriveCooling
Spinpoint F3 750GB Seagate 1TB None Custom loop 
OSMonitorMonitorKeyboard
W7 Ultimate x64 Asus ML249H Asus VE228H Alienware TactX 
PowerCaseMouseMouse Pad
OCZ 550W Antec 902 Alienware TactX Razer Sphex 
AudioAudio
E-MU 0404 USB Ultrasone DJ1 Pro Headphones 
CPUCPUMotherboardGraphics
Xeon E5405 Xeon E5405 SuperMicro X7DA3 ATI X1800 
RAMHard DriveCoolingCooling
16GB DDR2 FB-DIMM Various Hyper 101 Hyper 101 
OSMonitorPowerCase
ESXi 5.0 Headless Antec NEO ECO 620W Rosewill RSV-L4000 
MouseMouse PadOtherOther
None None HP P400 IPMI Card 
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HP Dual Gigabit NIC 
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Containment
(18 items)
 
Metamorphosis
(19 items)
 
 
CPUMotherboardGraphicsRAM
AMD 955BE Gigabyte GA-770TA-UD3 Asus GTX560ti 12GB DDR3 1333 CL7 
Hard DriveHard DriveOptical DriveCooling
Spinpoint F3 750GB Seagate 1TB None Custom loop 
OSMonitorMonitorKeyboard
W7 Ultimate x64 Asus ML249H Asus VE228H Alienware TactX 
PowerCaseMouseMouse Pad
OCZ 550W Antec 902 Alienware TactX Razer Sphex 
AudioAudio
E-MU 0404 USB Ultrasone DJ1 Pro Headphones 
CPUCPUMotherboardGraphics
Xeon E5405 Xeon E5405 SuperMicro X7DA3 ATI X1800 
RAMHard DriveCoolingCooling
16GB DDR2 FB-DIMM Various Hyper 101 Hyper 101 
OSMonitorPowerCase
ESXi 5.0 Headless Antec NEO ECO 620W Rosewill RSV-L4000 
MouseMouse PadOtherOther
None None HP P400 IPMI Card 
Other
HP Dual Gigabit NIC 
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Reply
post #5 of 5
No, 12v amperage makes that unit 500w at best.

And no; don't use that PSU with a GTX 470.
Test Bed
(24 items)
 
TTTbox
(15 items)
 
 
CPUMotherboardGraphicsRAM
Core i5 3570K  Biostar TZ774XE Power Color AX5770 1GB 4x4GB 1866Mhz 9-10-9-27-2T 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F3 1TB Samsung Spinpoint F3 1TB Western Digital Green 2TB Samsung Spinpoint M4 500GB 
Hard DriveOptical DriveCoolingOS
Intel X-25M G2 80GB Lite-On BluRay Drive Arctic Cooling Freezer 13 Pro Windows 7 Ultimate 
MonitorKeyboardPowerCase
Dell U2212HM Deck Legend Frost Tactile Silverstone Strider Plus 750w Custom Acrylic Test Bed 
MouseMouse PadAudioAudio
Logitech G500 Cooler Master Storm Tactics FPS Beyer Dynamics DT-990 600ohm Samson MediaOne 3A 
AudioAudioOtherOther
FiiO E09k QOGIR FiiO E17 ALPEN Microsoft Lifecam Studio Blue Yeti Pro Microphone 
CPUMotherboardGraphicsRAM
AMD A10-A5800K ASRock FM2A85X-ITX Radeon HD7770 1GB 2x8GB 1866mhz C9 
Hard DriveHard DriveOptical DriveCooling
SanDisk Ultra Plus 128GB 2TB 5400 RPM  24x DVD Drive Noctua L9A 
OSMonitorKeyboardPower
Windows 7 Home Premium 32" IPS TV Logitech K400 Seasonic G360 
CaseMouseAudio
Cooler Master Elite 120 Advanced Logitech K400 Trackpad Custom 2.1 Home Theater Setup 
  hide details  
Reply
Test Bed
(24 items)
 
TTTbox
(15 items)
 
 
CPUMotherboardGraphicsRAM
Core i5 3570K  Biostar TZ774XE Power Color AX5770 1GB 4x4GB 1866Mhz 9-10-9-27-2T 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F3 1TB Samsung Spinpoint F3 1TB Western Digital Green 2TB Samsung Spinpoint M4 500GB 
Hard DriveOptical DriveCoolingOS
Intel X-25M G2 80GB Lite-On BluRay Drive Arctic Cooling Freezer 13 Pro Windows 7 Ultimate 
MonitorKeyboardPowerCase
Dell U2212HM Deck Legend Frost Tactile Silverstone Strider Plus 750w Custom Acrylic Test Bed 
MouseMouse PadAudioAudio
Logitech G500 Cooler Master Storm Tactics FPS Beyer Dynamics DT-990 600ohm Samson MediaOne 3A 
AudioAudioOtherOther
FiiO E09k QOGIR FiiO E17 ALPEN Microsoft Lifecam Studio Blue Yeti Pro Microphone 
CPUMotherboardGraphicsRAM
AMD A10-A5800K ASRock FM2A85X-ITX Radeon HD7770 1GB 2x8GB 1866mhz C9 
Hard DriveHard DriveOptical DriveCooling
SanDisk Ultra Plus 128GB 2TB 5400 RPM  24x DVD Drive Noctua L9A 
OSMonitorKeyboardPower
Windows 7 Home Premium 32" IPS TV Logitech K400 Seasonic G360 
CaseMouseAudio
Cooler Master Elite 120 Advanced Logitech K400 Trackpad Custom 2.1 Home Theater Setup 
  hide details  
Reply
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