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 Help Needed-Looking for headphone+mic/headset under $90 - Forum gtx 770 psu Help - Forum Building a new PC need help figuring out the parts - Forum With my current setup, will a capture card help? - Forum Need Help Very Badly Please 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 Solvedcpu question help Forum SolvedFirst ever gaming computer help Forum SolvedHelp me consider buying Asus ROG despite the price Forum SolvedDual monitor set-up help Forum SolvedLooking for help to buy a new motherboard. Forum SolvedMinor and Very Rare Artifacts on R9 290X. Please Help! Forum SolvedNew Motherboard Help Forum SolvedHelp deciding on a laptop (Lenovo) Forum SolvedNeed help choosing monitors. Forum SolvedPSU Problem Help! *SOLVED* Forum SolvedGerman Bios , Help neded Forum Solvedcpu cooler help Forum SolvedBIOS Update help! Forum Solvednew win/8.1 pc annoying the absolute shit out of me!!! please help! Forum SolvedCPU Compatibility Help! 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 !