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 Should I get PS4 or PC. PLEASE HELP? - Forum Installing an SSD as an upgrade help - Forum Help upgrading motherboard - Forum Is this Computer build any good? Really need Help! - Forum Need help choosing a Z97 motherboard. - 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 SolvedMy fps is really low, please help! Forum SolvedHelp choosing PSU upgrade Forum Solvedlots of questions and need help Forum Solvedinstalling windows 7 onto my desktop help Forum Solvedplease help! I broke something and im not sure what it is Forum SolvedZalman z9 plus rear fan- where to install/give power- help! Forum SolvedGPU upgrade gone wrong! HELP! Forum SolvedBuild Help for Gaming PC Forum SolvedSata ports help Forum Solvedhi guys help on an old ss-ws53 surround sound speaker system Forum SolvedHDMI question help Forum SolvedFan Splitter Help Forum SolvedMotherboard and RAM compatability help Forum SolvedHELP! Connecting Corsair 650D fans! Forum SolvedSome help please .... Forum 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 !