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Dedicated 700w CoolerMaster Silent pro Gold for 2x SLI GTX 690...Couple of questions

post #1 of 5
Thread Starter 
Before everything, please check my system:
3570k 4.5GHz 1.31v H100 Push pull
8GB DD3 1600MHz G.skill
GTX 690 stock
HD Western Digital W10EARS 5400RPM 1TB
Sabertooth z77
700w Silent Pro Gold + XFX PRO 550w

I was thinking about buying a second GTX 690. But I know that I would need a better PSU. But since I have 2 of them, I would like to know if this is going to work: The 700w only to power the PCIE cables; In the case of two GTX 690 it would be required 2x PCIE cables 8 pins each, and the rest of the system would be powered by the 550w. Would that work?
post #2 of 5
The Silent Pro Gold 700W has a DC-DC secondary design, so is mostly immune to crossloading issues. It also has a +12V output around 700W. Your two GTX690s will pull a combined total of 600W.


So yes, it will work. Though I recommend against overclocking them; you don't have an excess of safety margin.
post #3 of 5
Thread Starter 
Thanks, man. Could you explain to me what "crossloading" means?
post #4 of 5
Quote:
Originally Posted by Guizin239 View Post

Thanks, man. Could you explain to me what "crossloading" means?
In many power supplies there is a single regulator for both the +5V and +12V rails.

This reduces cost but can also introduce voltage control issues when both rails are put under load.

As Phaedrus said, units with a DC/DC secondary design rather than AC/DC tend not to suffer from cross-load problems.
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(21 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core i7-3770K @ 4.3GHz Gigabyte GA-Z77X-UD5H ASUS GeForce GTX 980 Ti STRIX 6GB @ 1500MHz 2x8GB Kingston HyperX Fury DDR3 @ 2400MHz 
Hard DriveHard DriveCoolingCooling
Samsung 840 Pro 256GB Crucial MX100 512GB Noctua NH-U14S 3x Noctua NF-A14 FLX 
OSMonitorMonitorKeyboard
Windows 10 Pro 64-bit Dell U2713HM Dell U2312HM Ducky Shine 3 Year of the Snake (MX Brown) 
PowerCaseMouseMouse Pad
EVGA SuperNOVA P2 650W Fractal Design Define R5 Black Mionix Naos 7000 SteelSeries QcK 
AudioAudioAudioAudio
Sennheiser HD 650 (bal) Fostex TH-X00 Ebony Schiit Modi Multibit Schiit Jotunheim 
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TP-LINK Archer T9E  
CPUGraphicsRAMHard Drive
Intel Xeon E5-2620 v4 @ 3GHz Matrox G200eH2 4x8GB Kingston Dual Rank ECC DDR4 @ 2133MHz 2x Samsung PM863 120GB in RAID1 
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4x WD Red 3TB in RAID5 ESXi 6.5 
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post #5 of 5
Thread Starter 
Okay....Just realized something unsettling. My 700w PSU has 2x PCIe 6+2 pins. That is only enough to power a single GTX 690.

2 of those PCIe 6+2 pins: http://imageshack.us/photo/my-images/839/20130526140935.jpg/

GTX 690: http://imageshack.us/photo/my-images/12/20130526141839.jpg/

_____________________________________________________________________________

However, each PCIe 6+2 pin has an additional PCIe 6 pins coming out of them.

Like this: http://imageshack.us/photo/my-images/580/20130526141014.jpg/

____________________________________________________________________________

And the GTX 690 comes with two cables that transform 2x PCIe 6 pins into one PCIe 8 pin.

From this: http://imageshack.us/photo/my-images/837/20130526141152.jpg/ to this: http://imageshack.us/photo/my-images/547/20130526141232.jpg/

_____________________________________________________________________________

That would give me an additional 8 pin. But I need another 8 pin, because each GTX 690 asks two of them. For that, I would need two more 6 pin to transform into one 8 pin
So I was wondering whether using this one: http://imageshack.us/photo/my-images/824/20130526141509.jpg/ (there are two of them) in combination with the
GTX 690 adapters ( this one: http://imageshack.us/photo/my-images/837/20130526141152.jpg/) would work or not.


Actually, I was wondering if ANY of this "jerry-rig" would work AT ALL.


Sorry for the long post.
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