help... Tags: Graphics Cards Crossfire Graphics Product Last response: September 26, 2008 4:08 PM in Graphics & Displays Share Nica Guy September 26, 2008 6:16:51 AM http://www.newegg.com/Product/Product.aspx?Item=N82E168... is this enough for 2 4870s in crossfire? also how do amps and volts work in a psu? More about : question Zorg September 26, 2008 6:48:27 AM The 4870 in CF draws 255W or 21.25A. the PC P&C puts out 60A on a single rail. So yes, unless the rest of your specs are way out of the norm. What do you mean when you say how do volts and amps work in a PSU? Can you be more specific? Are you looking for Ohm's law or what? Nica Guy September 26, 2008 8:37:25 AM i dont know well what amps are... is there a conversion for amps-watts? Related resources Asus 660ti DCU2 SLI, 680 DCU2 TOP or 7970 Matrix - Forum Buying a new graphics card.Help? - Forum Need help: Right graphic card for video editing - Forum Settiing up 8800GTX in SLI - need help! - Forum Graphic card help - Forum Can't find your answer ? Ask ! Get the answer kingtz September 26, 2008 9:22:34 AM Power = Voltage x Current (watts) = (volts) x (amps) That's what I recall from physics. Not sure if there are modifiers for real world applications, but that equation should give a general relationship. Nica Guy September 26, 2008 10:04:56 AM k cool thanks that helped a bit JAYDEEJOHN a b U Graphics card September 26, 2008 10:55:48 AM Since your card runs on 12 volt, your multiplier/divider is 12. So, if your card uses 120 watts, you divide 12(volts) into 120(watts)= 10 amps rdb September 26, 2008 11:48:56 AM Yep, that will work. And that's a good one. Zorg September 26, 2008 4:08:18 PM See the other calculators on the left. Ohm's Law - Solving for Amperes when Watts, Volts are known Can't find your answer ? Ask ! Publish Related resources: Forumok.. i need help... ForumNeed a new monitor for gaming please help ForumNeed Urgent Help! ForumNeed Graphics Help ForumHelp troubleshooting display error More resources Read discussions in other Graphics & Displays categories Ati GPUs Graphics Cards Gtx HD Monitors SLI Crossfire Tuner Cards Radeon Video Diamond Multimedia Matrox Nvidia Palit PowerColor Asus Games !