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Trying to downgrade from 1500W Thermaltake Toughpower to Seasonic 850W

post #1 of 3
Thread Starter 
I tried swapping PSU's today and it would boot up with no Hard Drives, but once I plugged the HD's into the Seasonic it would not boot, just "click".

I am not sure why 850W is not enough, here's my system:

2x AMD 7970 in crossfire (I can take one out if it will help, but do not want to unless it will work)
1x i7 3960X Processor
1x 64 GB [8 GB x8] DDR3-1600 Memory Module - Corsair or Major Brand
1x Asetek 550LC Liquid CPU Cooling System
1x ASUS Sabertooth X79 -- 4x SATA 6GB/s, 4x USB 3.0
2x 240 GB Kingston HyperX SSD
2x 600 GB WD Velociraptor
1x [12X Blu-Ray] Pioneer BLU-RAY Re-Writer, DVD±R/±RW Burner Combo Drive
1x Killer 2100 Gaming Network Card

When I ran a calculator it only came out to like 660W or so.

Here is the CPU-Z:
http://i.imgur.com/pkOqe3z.png

I ordered it already overclocked when I bought it. How do I un-overclock it, or should I even need to? Is it as easy as going into the BIOS and flipping a setting?

I think my options are to undo the overclocking which I do not need or remove one of my 7970's which I assume will easily solve my problem. However as a test I unplugged the power of one of my 7970's from the Seasonic and it did not make a difference (still would not boot). I am not sure if the 7970 plugged into the MB would have the MB tell the PSU to reserve a set amount of Watts, not really sure how to phrase that since unplugging the power did not accomplish the same thing. I just would not want to go the trouble of removing the crossfire and unseating the card only to find out it does not make a difference.

By the way, the reason I am downgrading is so that I can hook this server up to a UPS without having to rewire my rental apartment (1500W PSU's require the upgraded amperage outlet).
Server for SQL
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Intel Core i7 3960X Asus Sabertooth X79 AMD Radeon HD 7970 AMD Radeon HD 7970 
RAMHard DriveHard DriveHard Drive
64GB DDR3 600 GB WD Velicoraptor 600 GB WD Velicoraptor 120 GB Kingston HyperX SSD 
Hard DriveOptical DriveCoolingOS
120 GB Kingston HyperX SSD 12X Pioneer BLU-RAY Re-Writer, DVD R/RW Asetek 550LC Liquid CPU Cooling System Windows 7 Professional 
MonitorPowerCase
HP ZR30w Seasonic 850W NZXT Phantom Full Tower Gaming Case 
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Server for SQL
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Intel Core i7 3960X Asus Sabertooth X79 AMD Radeon HD 7970 AMD Radeon HD 7970 
RAMHard DriveHard DriveHard Drive
64GB DDR3 600 GB WD Velicoraptor 600 GB WD Velicoraptor 120 GB Kingston HyperX SSD 
Hard DriveOptical DriveCoolingOS
120 GB Kingston HyperX SSD 12X Pioneer BLU-RAY Re-Writer, DVD R/RW Asetek 550LC Liquid CPU Cooling System Windows 7 Professional 
MonitorPowerCase
HP ZR30w Seasonic 850W NZXT Phantom Full Tower Gaming Case 
  hide details  
Reply
post #2 of 3
A quality 850w unit for the above setup is more than enough (even if it has oc'ed GPUs & CPU).

Besides, once you unplugged one of the 7970s, it still wouldn't boot. So the problem isn't 'not enough power'. (on the 12v line at least)

But if you plug in the Hard drives (I'm guessing both SSDs & HDDs) the PSU won't boot up.



Try one SSD at a time. Then one HDD at a time. Try replacing the power cable for the Hard drives (I think its a 4-way SATA power cable).

Disconnect all case fans & test.

A quality PSU like the one you have has all sorts of protection mechanisms so not to fry your components or make the apartment go up in flames if it detects an abnormality.

Here's how to put that cool rig in your sig:
http://www.overclock.net/t/1258253/how-to-put-your-rig-in-your-sig
TheSadFlute
(16 items)
 
DyingHeart
(17 items)
 
 
CPUMotherboardGraphicsRAM
i7-6700K TUF Sabertooth MSI 1080 Ti 16GB 2400MHz C15 
Hard DriveHard DriveHard DriveCooling
Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  BenQ XR3501 Logitech G710+ EVGA G2 750W 
CaseMouseAudioAudio
Cooler Master Stryker Logitech G602 Asus Strix Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
CaseMouseMouse PadAudio
Gigabyte  E-Blue Mazer XFX WarPad On-board 
Audio
Logitech G35 
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TheSadFlute
(16 items)
 
DyingHeart
(17 items)
 
 
CPUMotherboardGraphicsRAM
i7-6700K TUF Sabertooth MSI 1080 Ti 16GB 2400MHz C15 
Hard DriveHard DriveHard DriveCooling
Corsair 480GB LE 3TB WD Green Sammy 500GB 850 EVO H100i 
OSMonitorKeyboardPower
Windows 7 Pro  BenQ XR3501 Logitech G710+ EVGA G2 750W 
CaseMouseAudioAudio
Cooler Master Stryker Logitech G602 Asus Strix Nakamichi 5.1 
CPUMotherboardGraphicsRAM
Phenom II X4 965BE  Sapphire 790X Zotac GTX650  4GB Corsair 1066 DDR2 (1GBx4) 
Hard DriveHard DriveCoolingCooling
G.Skill Phoenix Pro 120GB WD 2TB Green Stock 3x120mm UQ fans 
OSMonitorKeyboardPower
W7 Pro SP1 x64 LG 21' 1680x1050 Genius  Corsair CX600 
CaseMouseMouse PadAudio
Gigabyte  E-Blue Mazer XFX WarPad On-board 
Audio
Logitech G35 
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Reply
post #3 of 3
Thread Starter 
Thanks for the reply, I should note, when I plug the 1500W back up everything powers up as normal so I think I can rule out a faulty HDD power cable.

I'm still tempted to unplug a 7970 from the mb, since the crossfire cable is connected between the cards wouldn't it expect both to have power?
Server for SQL
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Intel Core i7 3960X Asus Sabertooth X79 AMD Radeon HD 7970 AMD Radeon HD 7970 
RAMHard DriveHard DriveHard Drive
64GB DDR3 600 GB WD Velicoraptor 600 GB WD Velicoraptor 120 GB Kingston HyperX SSD 
Hard DriveOptical DriveCoolingOS
120 GB Kingston HyperX SSD 12X Pioneer BLU-RAY Re-Writer, DVD R/RW Asetek 550LC Liquid CPU Cooling System Windows 7 Professional 
MonitorPowerCase
HP ZR30w Seasonic 850W NZXT Phantom Full Tower Gaming Case 
  hide details  
Reply
Server for SQL
(15 items)
 
  
CPUMotherboardGraphicsGraphics
Intel Core i7 3960X Asus Sabertooth X79 AMD Radeon HD 7970 AMD Radeon HD 7970 
RAMHard DriveHard DriveHard Drive
64GB DDR3 600 GB WD Velicoraptor 600 GB WD Velicoraptor 120 GB Kingston HyperX SSD 
Hard DriveOptical DriveCoolingOS
120 GB Kingston HyperX SSD 12X Pioneer BLU-RAY Re-Writer, DVD R/RW Asetek 550LC Liquid CPU Cooling System Windows 7 Professional 
MonitorPowerCase
HP ZR30w Seasonic 850W NZXT Phantom Full Tower Gaming Case 
  hide details  
Reply
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