Solved
How many amps will I need for a R9 270X CrossFireX
FoxYxFreedom
Hi, I have run my system through various PSU calculators, and my system came out @ around 450w, but I want to CrossFireX R9 270X's, so how many amps do I need to run my system??
My specs are; Intel I5 3570k OC'd to 4.4 ghz
A gigabyte Z77 D3H
8gb of corsair 1600mhz
Arctic Cooling Freezer 13 High Performance CPU Cooler
Seagate ST1000DX001 1TB Hybrid Drive
Sapphire R9 270X DualX Boost OC 2GB Graphics Card
If anyone could help, it would be much appreciated:)
My specs are; Intel I5 3570k OC'd to 4.4 ghz
A gigabyte Z77 D3H
8gb of corsair 1600mhz
Arctic Cooling Freezer 13 High Performance CPU Cooler
Seagate ST1000DX001 1TB Hybrid Drive
Sapphire R9 270X DualX Boost OC 2GB Graphics Card
If anyone could help, it would be much appreciated:)
5
answers
Last reply
Best Answer
More about amps 270x crossfirex

Best answer
If you just calculate the amps based on the watts you get and using the +12 volt rail as an example it is 37.5 amps.
A system with 2 x 270X calls for 700watts http://www.realhardtechx.com/index_archivos/Page362.htm That is not based on quality PSU's so really a quality 650watt with 4 x PCIe power connectors would handle it fine. 
For a system using two AMD Reference Design Radeon R9 270X graphics cards in 2way CrossFireX mode AMD specifies a minimum of an 700 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 43 Amps or greater and have at least four 6pin PCI Express supplementary power connectors.
Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C  50°C ambient temperature, is the most critical factor.
Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.
The +12 Volt continuous current rating of 43 Amps or greater, that I specified above, will handle the running of FurMark stability testing and GPGPU usage with two overclocked AMD Reference Design Radeon R9 270X cards. It should also be sufficient to handle the overclocking of the i53570K to 4.4 GHz. 
ko888 said:For a system using two AMD Reference Design Radeon R9 270X graphics cards in 2way CrossFireX mode AMD specifies a minimum of an 700 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 43 Amps or greater and have at least four 6pin PCI Express supplementary power connectors.
Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C  50°C ambient temperature, is the most critical factor.
Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.
The +12 Volt continuous current rating of 43 Amps or greater, that I specified above, will handle the running of FurMark stability testing and GPGPU usage with two overclocked AMD Reference Design Radeon R9 270X cards. It should also be sufficient to handle the overclocking of the i53570K to 4.4 GHz.
Im about to get the same video card.. but single not crossfire.
I cant find anywhere about the 12v amps requirement....
but i have a Antec EW 650 watts that has 3 12v rails (+12V1@22A, +12V2@22A, +12V3@25A)
should my PS run this video card with no problem or i have to get a new ps???
thanks in advance
Related Resources
Ask a new question
Read More
Various
Power Supplies
Graphics Cards
Components
Related Resources
 solved How many amps does a 650w psu need?
 solved How many amps do i need for a gaming computer?
 solved how many more years will i be able to play games on the r9 270x 2gb,8 gbs of ram and an i3 2120 processor
 solved how many differences there are between R9 270x from Asus and Gigabyte
 solved how many coolers are required for an r9 270x direct cu 2?
 solved How many frames will a A10 7850k at 4.5 ghz get with a r9 270x on minecraft with shaders?
 solved How many R9 270X DualX can I use in parallel?
 really need to know how many amps a 1gb gddr5 r7 240 uses
 need to know how many amps the 1gb gddr5 r7 240 reuires
 need to know how many amps the 1gb gddr5 r7 240 reuires
 How many Amps do i need?
 How many amps do I need? I have big list of total amps!
 how many asus r9 270x cards could i run from a corsair ax1200i 1200w power supply
 How many AMPS needed to run Radeon 6970?
 solved PC Upgrades for CrossfireX R9 270X