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Motherboard PCIe slot poiwer limitations

post #1 of 2
Thread Starter 
How do I determine the power limitations of ALL the PCI slots combined on a mother board?

For example I have an ASUS M5A97 R2.0 and a ASRock x99 Extreme 4. The x99 board has 4 PCIe slots and a separate power connector for the PCIe slots, so obviously it has a higher power capability than the ASUS board which has 2 slots and no extra connector. But I have not seen where a rating is stated. Can I just assume that every PCI slot can provide 75w even if all are in use?
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W10 Desktop
(17 items)
 
Linux Desktop
(14 items)
 
Win 10 HTPC
(12 items)
 
CPUMotherboardGraphicsGraphics
Intel 5820k ASRock x99 Extreme 4 GTX-960 GTX-750ti 
GraphicsRAMHard DriveHard Drive
HD 7850 4 x 4G DDR4 128G Corsair SSD WD 1G  
Hard DriveOptical DriveCoolingOS
WD 2G generic CDRW/DVD CM 212 EVO Win 10 
MonitorKeyboardPowerCase
ASUS 1920x1200 IPS Microsoft Be Quiet 1000 Antec 305 
Mouse
Reaper 
CPUMotherboardGraphicsRAM
AMD FX-6300 ASUS M5A97 R2.0 GTX-760 Samsung 2 x 4G Wonder Ram 
Hard DriveHard DriveOptical DriveCooling
128G Corsair SSD WD 500G Blue generic CDRW/DVD Corsair H60 
OSMonitorKeyboardPower
Linux Mint 17.2 ASUS 1920x1200 IPS Microsoft XFX 650 
CaseMouse
NZXT 210 Reaper 
CPUMotherboardGraphicsRAM
AMD Phenom II B93 Gigabyte  EVGA GT 740 FTW Misc DD2-800 2x2G and 2x1G 
Hard DriveOptical DriveOSMonitor
Seagate  generic  Win 10 Tech Preview 64 bit HDTV 
KeyboardPowerCaseMouse
HP Corsair cx430 Aptevia HTPC IBM 
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post #2 of 2
75 watts is the specification limit for the connector. I believe the extra power connector is simply there to help reduce voltage drop when pushing multiple slots near their power limit. Rather than relying on all of the power to be transfered across the traces of the motherboard, it allows for a more direct path and reduced conductor resistance.
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