Overclock.net › Forums › Components › Power Supplies › How strong of a GPU will this PSU support?
New Posts  All Forums:Forum Nav:

How strong of a GPU will this PSU support?

post #1 of 24
Thread Starter 
OK, I don't own a Kill-A-Watt but I do have a Mulitmeter. So I modified a spare PSU cable and tied my meter into the circuit and came up with the following...

Voltage reading at the wall socket my PSU is connected to: 123.8 Volts

I proceeded to record the following. Each step is an added load.

Idle: .72A = 89W
Playing music (using DVD Drive): .86A = 107W
Running Prime95: 1.63A = 202W
Furmark: 1.78A = 220W


So, to recap, Playing a CD while running Prime + Furmark = 220 Watts from the wall.

My PSU, a Rosewill RV350-2, is rated at 350 Watts but I can't find an efficiency rating anywhere. So for this experiment, I'm going to assume 75% efficiency. Because that's what Google says the "average" OEM PSU is capable of. And, I figure at a load of 220W, I've got to be close my PSU's "sweet-spot". That said...

PSU is outputting 165 Watts.

Leaving me 185 Watts to play with.

Searching around, I find that my lowly HD6450 pulls about ~35W MAX. So I could assume that I have 220W to play with. But lets just use that 35W as a safety barrier.

If all my math and logic is correct here, I can shop for a GPU that consumes 185W or less, correct?
Edited by Baskt_Case - 4/12/13 at 8:22pm
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
post #2 of 24
So I also have a multimeter but no Kill-a-Watt meter and I understand ohm's law. How did you measure current from the wall? Voltage is easy but current you must have the meter in series during he load testing while it is on yet still connected to the wall... Did you remove sleeving from the power cable?
     
CPUMotherboardGraphicsRAM
Intel Core i7-875K (4.0GHz) Gigabyte mATX GA-H57M-USB3 EVGA GTX 670 2GB 8GB G.Skill Eco 1600MHz DDR3 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 470 SSD 128GB Samsung Spinpoint F1 1TB Seagate Desktop HDD.15 4TB (RAID-1) Samsung Blu-ray Reader 
CoolingOSMonitorKeyboard
Thermalright True Spirit 120M Windows 7 Ultimate (64-bit) QNIX QX2710 27" 2560x1440 CM Storm Quickfire TK (Cherry MX Brown) 
PowerCaseMouseMouse Pad
Antec Neo Eco 620W Lian-Li PC-A04B Razer Deathadder 2013 Razer Sphex 
AudioAudioAudio
Realtek ALC889 codec + Dolby Home Theater (onbo... Klipsch Promedia 2.1 speakers 200W Razer Carcharias 
CPUMotherboardGraphicsGraphics
Intel Core i7-4870HQ Custom Radeon R9 M370X Intel Iris Pro 5200 
RAMHard DriveOptical DriveCooling
16GB 1600MHz DDR3L Samsung 512GB PCIe x4 SSD None Dual blower-style Fans 
OSMonitorKeyboardPower
macOS 10.13 15.4" 2880x1800 IPS "Retina Display" Chiclet Backlit 85W MagSafe 2 
CaseMouseAudio
Some black hardshell thing Force Touch Trackpad Integrated speakers 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
Intel Core i7-875K (4.0GHz) Gigabyte mATX GA-H57M-USB3 EVGA GTX 670 2GB 8GB G.Skill Eco 1600MHz DDR3 
Hard DriveHard DriveHard DriveOptical Drive
Samsung 470 SSD 128GB Samsung Spinpoint F1 1TB Seagate Desktop HDD.15 4TB (RAID-1) Samsung Blu-ray Reader 
CoolingOSMonitorKeyboard
Thermalright True Spirit 120M Windows 7 Ultimate (64-bit) QNIX QX2710 27" 2560x1440 CM Storm Quickfire TK (Cherry MX Brown) 
PowerCaseMouseMouse Pad
Antec Neo Eco 620W Lian-Li PC-A04B Razer Deathadder 2013 Razer Sphex 
AudioAudioAudio
Realtek ALC889 codec + Dolby Home Theater (onbo... Klipsch Promedia 2.1 speakers 200W Razer Carcharias 
CPUMotherboardGraphicsGraphics
Intel Core i7-4870HQ Custom Radeon R9 M370X Intel Iris Pro 5200 
RAMHard DriveOptical DriveCooling
16GB 1600MHz DDR3L Samsung 512GB PCIe x4 SSD None Dual blower-style Fans 
OSMonitorKeyboardPower
macOS 10.13 15.4" 2880x1800 IPS "Retina Display" Chiclet Backlit 85W MagSafe 2 
CaseMouseAudio
Some black hardshell thing Force Touch Trackpad Integrated speakers 
  hide details  
Reply
post #3 of 24
Thread Starter 
Quote:
Originally Posted by Baskt_Case View Post

So I murdered a spare PSU cable and tied my meter into the circuit and came up with the following...

Quote:
Originally Posted by Doomtomb View Post

So I also have a multimeter but no Kill-a-Watt meter and I understand ohm's law. How did you measure current from the wall? Voltage is easy but current you must have the meter in series during he load testing while it is on yet still connected to the wall... Did you remove sleeving from the power cable?

I"ll try to post a picture in a minute...
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
post #4 of 24
Thread Starter 
OK, here is the aforementioned PSU cable that is now in my permanent collection of "test-gear/parts/stuff-I-need." Pictured is the hacked cable, multimeter test leads, and the electric tape that I wrapped around the bare ends when I twisted them around the leads.

    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
post #5 of 24
Thread Starter 
Anyone have input at all?

According to what I've found, I'm square in GTX 670 and HD7850 territory. Granted, I'd be wishing early death on my PSU, but still. I bet it would live for a year or so.
Edited by Baskt_Case - 4/12/13 at 12:33am
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
post #6 of 24
The 670 sips power. I have a Belkin Insight hooked up to my rig's outlet and I've yet to pull over 250W while gaming... honestly most of the time I'm around 175-190. So you should be fine with a 350W unit, but I can't speak to the quality of that PSU.

I bought this PSU back when I was running SLI btw... tongue.gif
post #7 of 24
Thread Starter 
If I end up with a pretty powerful card, I will probably back off the OC on the CPU and only fold on the GPU. Very interesting to see the actual numbers when you start measuring things. Before I started, I was afraid I was going to blow the 10A fuse in my little ol' multimeter. Of course, that's just silly, it would take in excess of 1200W to do do that.
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
post #8 of 24
Thread Starter 
I realize that I probably cannot just use whatever wattage is "left over", and I have to consider the specific capabilities of my PSU. I need some help on this point.

Rosewill lists the following for my PSU:

+3.3V@20A, +5V@12A, +12V1@10A, +12V2@13A, -12V@0.3A, +5VSB@2.5A

Can someone help me understand this as it would pertain to powering a GPU, and ultimately what power reserves I actually have to power a GPU with.
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
post #9 of 24
The 12V rail(s) would power the GPU.

I'm not very familiar with how it all breaks down on a dual rail PSU like yours,
but in the case of a single rail, you would multiply the amps of the 12V by twelve,
and that's the rated wattage for the rail powering your main components.

Without really knowing how dual rails units differ,
I would only hesitate to say you should run a singular component that couldn't be powered itself by one rail of the PSU.

BTW - Is this yours?
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182023
Nm-- just noticed your sig has the model #.
Edited by Rezard - 4/12/13 at 8:48pm
Quantum
(16 items)
 
First Knight
(13 items)
 
MiniMicro
(16 items)
 
CPUMotherboardGraphicsGraphics
A8-3870K @ 3.5Ghz Gigabyte GA-A75-UD4H Radeon HD 6550D Radeon HD 6670 (GDDR5) 
RAMHard DriveOptical DriveCooling
Trident X DDR3 2400 Mushkin Cronos Deluxe Asus Black DVD-RW Xigmatek Gaia (XAF) 
CoolingOSMonitorPower
G.Skill Turbulence II Windows 7 x64 32" LCD TV Rosewill HIVE 550W 
Case
Lian Li PC-K65 
CPUMotherboardGraphicsRAM
a4-3400 GAA75M-DS2 Radeon HD 6410D Samsung 30nm 
Hard DriveHard DriveOptical DriveCooling
OCZ Agility 2 WD Caviar Green DVD-R/W Cooler Master Vortex Plus 
CoolingCoolingCoolingCooling
2x SilenX 60mm Ixtrema SilenX 80mm Red LED Effizio SilenX 80mm Ixtrema Rosewill 90mm PCI slot fan 
CoolingMonitorPowerCase
2x 50mm Whatever it's near Top Power 400W Top Power 1600 Series 
  hide details  
Reply
Quantum
(16 items)
 
First Knight
(13 items)
 
MiniMicro
(16 items)
 
CPUMotherboardGraphicsGraphics
A8-3870K @ 3.5Ghz Gigabyte GA-A75-UD4H Radeon HD 6550D Radeon HD 6670 (GDDR5) 
RAMHard DriveOptical DriveCooling
Trident X DDR3 2400 Mushkin Cronos Deluxe Asus Black DVD-RW Xigmatek Gaia (XAF) 
CoolingOSMonitorPower
G.Skill Turbulence II Windows 7 x64 32" LCD TV Rosewill HIVE 550W 
Case
Lian Li PC-K65 
CPUMotherboardGraphicsRAM
a4-3400 GAA75M-DS2 Radeon HD 6410D Samsung 30nm 
Hard DriveHard DriveOptical DriveCooling
OCZ Agility 2 WD Caviar Green DVD-R/W Cooler Master Vortex Plus 
CoolingCoolingCoolingCooling
2x SilenX 60mm Ixtrema SilenX 80mm Red LED Effizio SilenX 80mm Ixtrema Rosewill 90mm PCI slot fan 
CoolingMonitorPowerCase
2x 50mm Whatever it's near Top Power 400W Top Power 1600 Series 
  hide details  
Reply
post #10 of 24
Thread Starter 
Yea, that's the one. I've got a link directly to Rosewill's page for it in my original post.

I need to find more specific documentation for it, so I know which Rail is powering what.

I would be using a Molex to 6-pin adapter which has 2 molex connections on it. Molex connectors have both 5V and 12V. So that right there is going to be two separate rails. And without knowing which 12V rail my molex connectors are on, I really dont know anything useful at all.
Edited by Baskt_Case - 4/12/13 at 8:57pm
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
FX-8350 @ 4.6GHz 1.48v 990FXA-UD3 Pegatron HD6450 1GB 2x4GB G.Skill Sniper 1866 
Hard DriveOptical DriveCoolingOS
WD Blue 500GB Samsung DVD-RW Corsair H100i Win 7 x64 
MonitorPowerCase
LG 32" 720p HDTV SeaSonic M12II 620 Bronze CM 690 II Advanced 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › How strong of a GPU will this PSU support?