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Advice on PSU - Page 2

post #11 of 18
If you enter the correct infomation in the link below it will tell you the total PSU wattage required. Most PSU calculators are rough estimates and error on the high side because too little power causes your system to crash. Buying an under-sized PSU for the application can be an expensive lesson.

http://extreme.outervision.com/psucalculatorlite.jsp

What's more important however is the amperage available on the 12v rail(s) as these power the CPU/GPU and require the most power.

You can search and find the max power consumption in watts for your Vid cards and divide by 12v to determine the amps for the cards. If you add 15 amps to power the CPU and other components you will be very close to the max 12v rail amps required. It's always best to leave a little safety margin so that your PSU is not near 100% load when you're running the system hard like in gaming.

Testing seems to indicate that two 560 Ti's in SLI consume about 300W = 25 amps @ 12v. So 25 amps. for the Vid cards plus 15 amps. for the CPU and other hardware means you need a minimum of ~ 40 amps. avialable on the 12v rail(s). With a safety margin you should think ~45 amps. minimum IMO.

Jonnyguru and HardwareSecrets will show you which PSUs are quailty models that can deliver the correct power. Don't buy on brand unless it's Seasonic or PC Power and Cooling. Read PSU reviews for the exact model you are considering as all models in the same product line are not necessarily the same in quailty or produced by the same manufacturer.

http://www.guru3d.com/article/geforce-gtx-560-ti-sli-review/14
Edited by AMD4ME - 3/10/12 at 5:49pm
post #12 of 18
I actually used a d/lable one that has all the new cards in it as that one is missing all the newer cards.
post #13 of 18
Hi, I also was wondering about the size of power supply unit i would need for my computer in the view of getting SLi. I have a very similar build and also looked at online PSU calculators which said I would need 900watt.

Build:
2500k 3.3ghz OC 4.1ghz
8gb DDR 3 1600mhz
Corsair 120g GT (red one)
1tb 7200rpm
1gb MSI GTX560ti (with the aim to get another)
Corsair h80
dvd drive

I read through the comments made about how 750watt would be a good amount for him to go for with his build I was just wondering with the water-cooling and OC if it would still be good size for me as well?

As when you start to push past 850watts PSU boost in price.

Would be grateful for any help on this,

Thanks

P.S also plan on getting AeroCool Strike-X GT with it so lots of fans if that helps?
post #14 of 18
Quote:
Originally Posted by HexCore View Post

Hi, I also was wondering about the size of power supply unit i would need for my computer in the view of getting SLi. I have a very similar build and also looked at online PSU calculators which said I would need 900watt.

OP is plenty fine with a decent 650W. Particularly with your i5-2500k, which has no hyperthreading and is on 32nm instead of 45nm and has a relatively low overclock, plus you being down a few hard drives, you should be pulling some 50W or so less. Above 650W is excessive for your system with two GTX 560 Ti.
post #15 of 18
Thank you, i donno why it was telling i would need 900watts maybe i filled in the forms wrong smile.gif

plus rep for you smile.gif
post #16 of 18
Thread Starter 
I just got my PSU.

I was able to get a Corsair HX850 for a good deal below RRP.

Installed and working. This will easily feed my new card when it comes.

Thanks.
    
CPUMotherboardGraphicsGraphics
Intel Core i7 860 Asus P7P55D-E Pro MSI GTX560 Ti TwinFrozr II MSI GTX560 Ti TwinFrozr II 
RAMHard DriveHard DriveHard Drive
Corsair 8GB DDR3 OCZ Vertex 3 Western Digital Caviar Black Western Digital Caviar Green 
Hard DriveOptical DriveCoolingOS
Samsung 840 Pro Lite-On 24x DVD-RW CoolerMaster V8 Windows 8.1 Professional 
OSMonitorMonitorMonitor
Debian 7.1 Samsung S22B350H Samsung S22B350H Samsung S22B350H 
KeyboardPowerCaseMouse
Ducky Shine II Corsair HX850 CoolerMaster Storm Enforcer Logitech M500 
Mouse PadAudio
Razer Goliathus Microsoft LifeChat LX 3000 
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CPUMotherboardGraphicsGraphics
Intel Core i7 860 Asus P7P55D-E Pro MSI GTX560 Ti TwinFrozr II MSI GTX560 Ti TwinFrozr II 
RAMHard DriveHard DriveHard Drive
Corsair 8GB DDR3 OCZ Vertex 3 Western Digital Caviar Black Western Digital Caviar Green 
Hard DriveOptical DriveCoolingOS
Samsung 840 Pro Lite-On 24x DVD-RW CoolerMaster V8 Windows 8.1 Professional 
OSMonitorMonitorMonitor
Debian 7.1 Samsung S22B350H Samsung S22B350H Samsung S22B350H 
KeyboardPowerCaseMouse
Ducky Shine II Corsair HX850 CoolerMaster Storm Enforcer Logitech M500 
Mouse PadAudio
Razer Goliathus Microsoft LifeChat LX 3000 
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post #17 of 18
Oh nice, The HX850 is a very good power supply. Well worth even retail price, so great job on getting a discount thumb.gif

Hope it treats you well smile.gif
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Hard DriveHard DriveHard DriveOptical Drive
Samsung 840 EVO 250GB Western Digital 3TB Black 1TB External HDD External Optical Drive 
CoolingOSKeyboardPower
Noctua NH-D15 Windows 10 Microsoft Sidewinder X4 Corsair HX750i 
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post #18 of 18
Quote:
Originally Posted by AMD4ME View Post

What's more important however is the amperage available on the 12v rail(s) as these power the CPU/GPU and require the most power.
You can search and find the max power consumption in watts for your Vid cards and divide by 12v to determine the amps for the cards.

i agree with this, a lot of cheaper power supplies claimed to put out 650W or so really dont do so. its a lot cheaper for a company to produce a power supply that can put out 650W on the 5V rail and market it as a 650w psu. end result is people buy it not knowing that its really only going to put out 400W on the 12v rail. what people really need to get into the habit of doing is not reading the box, but actually look at the sticker on the psu that states the amps provided on each rail, then work out the watts provided from the 12V rail. a 650w psu should really put out 50Amps on the 12V rail, ive seen way too many 650W psu's put out half that much
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Finally Finished!
(14 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 3930K Batch: 3135B495T Gigabyte X79 UD7 GTX 570 3-way SLi Corsair Vengeance 1600mhz CL9 
Hard DriveCoolingOSMonitor
60GB OCZ Vertex II / 3x 500GB Samsung Spinpoint EK Supreme HF Nickel, EK DCP4.0, Stealth GT 360... Windows 7 Ult 64bit Acer 22" G225HQ 
KeyboardPowerCaseMouse
Razor Lacosa Mirror Edition Silverstone Strider 1500w  Aerocool X-Preditor  CM Storm Sentinel Advanced 
Mouse Pad
Razer Goliathus Speed edition 
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Reply
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