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 Need Monitor Help - Forum Help! Malware that can not be removed? - Forum Xbox wifi help ! - Forum intel based build parts help for $600-500 - Forum Need help about the Installation Gtx 970 - 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 Solvedhey i need your help Forum SolvedNeed help to choose the best microATX motherboard!!! Forum Solvedneed help on finding parts for a light amd gaming build for around $600-500 Forum SolvedHelp me Build a PC Forum SolvedPls help Can i run shadow of mordor? Forum SolvedHelp Me Find a Motherboard Forum SolvedPC build help Forum SolvedFirst time building a gaming PC need help with the build Forum SolvedFirst Build, gaming at 4k - Help please! Forum SolvedHelp with random system restart when playing games Forum SolvedHelp setting up dual monitors Forum SolvedMemory Noob Please Help Forum SolvedBeginner need help with overclocking Forum SolvedI want to build a PC under 1300$ which includes nVIDIA GTX 980 ($550). Help me? Forum SolvedNew System Build / Help Appreciated 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 !