4870x2 x2crossfire

[95thrifles]

better off with just 2 4890s imo
and PC P&C 750W PSU, very solid PSU

 

[AMG]

na two HD4890s

and a decent 750watt (PCP&cooling) OR A GOOD 800WATT modular like a tagan,corisr etc etc I ordered a 800watt tagan and got a 1kw o.o (fine by me)

 

[kylew]

it's NOT about watts its amps thats more important. many people think watts is more important which it's not.

It's about both, but watts is what you see more information on. That was my point as well though, people don't understand how a PSU works, they don't understand how the wattage draw works either.

 

[gareth170]

It's about both, but watts is what you see more information on. That was my point as well though, people don't understand how a PSU works, they don't understand how the wattage draw works either.

yeah

but i was just making a point that most people will think if they see a let's say a 800w psu they'll think mmm thats ok to power a high end system but if the psu as low amps thats when problems starts..

its the Max. Output Current & Max. Combined Power that important..

 

[fornowagain]

The clue is in the name, power supply. Power, watts. What matters is not the overall wattage of the psu as that's meaningless. With modern PC loads its the total combined 12v power output. Specified in watts, but you can use amps if you like

 

[james201]

hi there, i would reccommend this, it is a fairly useful tool,

Asus Power Supply Calculator

 

[gareth170]

the problem with using the Power Supply Calculator is it only tells u the watts u need, it doesn't tell u the amps.

 

[arc@css]

I couldn't get it to work, not properly anyway.

 

[gareth170]

I couldn't get it to work, not properly anyway.

try this http://support.asus.com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-us

that Power Supply Calculator is way off. it tells me i need a 1050w psu for my setup lol

this one better http://www.extreme.outervision.com/psucalculatorlite.jsp

 

[AMG]

what about antecs one

http://www.antec.outervision.com/

I got about 750watt if the system was not *aged* otherwise it would be 810watt .....great

 

[gareth170]

what about antecs one

http://www.antec.outervision.com/

I got about 750watt if the system was not *aged* otherwise it would be 810watt .....great

on that one it says 500w for my setup

edit: and if i put 4870x2 crossfire it says 740w.

 

[fornowagain]

A 4870x2 TDP is around 270W, mostly at 12v. A second one isn't going to use 100% in crossfire, but it is I guess what they'll have based it on.

 

[gareth170]

so a 800w should power a system with 2 4870x2.

 

[fornowagain]

The overall power of the PSU don't mean squat tbh. Look at the combined 12v wattage, something like a PCP&C 750w with a nice big single rail 720w/60A at 12v should be ok.

 

[gareth170]

my Tagan PipeRock 900w Modular as a Max. Combined Power of 840w/72A at 12v so this tagan psu would do fine for the OP too. it can be used as a multi rail (x6) or a big single rail

 

[arc@css]

Cheers for other calc links