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Modular power supply question regarding PCI-e

post #1 of 9
Thread Starter 
http://www.newegg.com/Product/Product.aspx?Item=N82E16817153158

I now am a new owner of this power supply with no possibility of return.

I have a TR2 750w from thermaltake at the moment which I can't complain.

My question is, this power supply has 2 PCI-e modular connectors, each connector has 2 8pin connectors at the end. Would I connect ONE pci-e cable into my power supply and both 8pin's in to my video card or would i connect both PCI-e cables into the power supply and one from each?

Sorry for the silly question, I've never owned a power supply like this so it is new to me frown.gif
  
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post #2 of 9
Either option you provided should work just fine
post #3 of 9
yeah either way, except i would use just the one connector to keep the number of cables down to a minimum.
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Going to be chaep
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post #4 of 9
One for each
 
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post #5 of 9
Thread Starter 
2 votes for 1 connection with 2 heads and 1 vote for 2 connections with 1 head


Out of curiosity, will using 1 connection and both heads deliver any less power? Again sorry but this is new to me i've never seen a PCI-e plugin to the psu that had 2 8pins at the end frown.gif
  
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post #6 of 9
i have only ever used one for my 7950 and never had any power issues. interesting question tho about power delivery using 2 compare to 1 smile.gif
Going to be chaep
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Win 7 ultimate Samsung Syncmaster 932gwe+ OCZ ZT series 550W Coolermaster 410 
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Going to be chaep
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Wife's Rig
(12 items)
 
 
CPUMotherboardGraphicsRAM
i7-3770k Gigabyte GA-Z77X-UP5 TH MSI GTX460 G.Skill TridentX 2400 2 x 4GB 
Hard DriveHard DriveOptical DriveCooling
Plextor M5p 128GB 2 x WD 500GB Blues LG Prolimatech Megahalems Rev C 
CoolingOSMonitorPower
Arctic F12 CO PWM x 2 Push/Pull Windows 7 64 bit Ultimate LG IPS235V Corsair AX850 
Case
Coolermaster HAF 912 advanced (Asia version) 
CPUMotherboardGraphicsRAM
I5-3570K Gigabyte Z68X-UD3H-B3 Inno3D Ichill GTX660 8GB G.Skill RipjawsX 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 830 128GB WD black 500GB Liteon Coolermaster Hyper 212+ EVO 
OSMonitorPowerCase
Win 7 ultimate Samsung Syncmaster 932gwe+ OCZ ZT series 550W Coolermaster 410 
CPUMotherboardRAMHard Drive
1.67Ghz Atom stock 1GB DDR2 2 x 500GB Western Digital Cavier Blacks [RAID 1] 
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stock DSM3.2 [built on linux] stock stock 
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Synology DX510 Expansion unit 5 x 1TB WD Cavier Blacks in a RAID 6 
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post #7 of 9
That PSU has a single 12V rail.

PCIE power connectors contain +12V and ground connections.
This means that no matter what connectors you plug into it, as far as the 12V feeds are concerned they all connect back to the same single 12V rail.

It really makes no difference in terms of power supplied to the graphics card if you use 2 connectors from 1 cable or 1 connector from 2 cables.
post #8 of 9
Thread Starter 
Quote:
Originally Posted by Spengler View Post

That PSU has a single 12V rail.

PCIE power connectors contain +12V and ground connections.
This means that no matter what connectors you plug into it, as far as the 12V feeds are concerned they all connect back to the same single 12V rail.

It really makes no difference in terms of power supplied to the graphics card if you use 2 connectors from 1 cable or 1 connector from 2 cables.
Thank you mate
You have cleared this up for me, thanks to all who posted.
I now know whether 2 cables into the psu or 1 cable into the psu, the power delivery will be the same, this is good news also because 1 cable is definitely for cable management then 2 biggrin.gif

Edit-
out of curiosity, which do you guys find more efficient? the trx 750m or sp-850m ? I'm reading there specs now but i truly don't know in what scenarios less or more is better
Edited by INCREDIBLEHULK - 3/30/13 at 11:34pm
  
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post #9 of 9
Quote:
Originally Posted by INCREDIBLEHULK View Post

Edit-
out of curiosity, which do you guys find more efficient? the trx 750m or sp-850m ? I'm reading there specs now but i truly don't know in what scenarios less or more is better

Just in case you didn't know, in this context almost everybody universally means "electric conversion efficiency" when they say "efficiency", but guessing by context, I don't think that's really what you're asking. Electric conversion efficiency is the ratio of power output (which is the power consumed by the computer components other than the power supply) over the power input into the power supply. It depends on a lot of things like the power supply circuit and components—hence some models are overall more efficient than others—power supply loads, and temperatures.

My guess is that you're asking about overall quality (reliability too?) and usability maybe?

Thermaltake Smart M 850W (SP-850M) is newer and better than the TR2 RX 750W (TRX-750M) in pretty much every way. It uses a more sophisticated circuit design, a little better parts, and thus achieves higher performance than the TRX. Whereas the TRX goes wildly out of spec if you actually try to pull 750W from it (actually, starting to go out of spec not too much past 500W), the Smart M exceeds requirements in some areas by a pretty wide margin. It's also a bit more efficient overall, and it has a little better of a cable selection.
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