Psu compatibility

[shehryar1]

hello guys i wanted some help with my psu.

i want to buy a sapphire r7 260x 1gb ddr5 128bit graphics card. it requires a 500 watt psu with 30 amps on the 12 volt rail. but my 650 watt psu has three 12 volt rails at 18 amps.

my question is:

Will my psu be able to run my gpu at  full load without any problem?

Will i be able to overclock?

PC specs:

Brand: Lenovo
Model: S20
Cpu: Intel Xeon w3520
Frequency : 2.66ghz
Turbo boost: 2.9ghz
Cache: 8mb
Cores:4
Threads: 8
Motherboard: x58 sli Mother board
Ram: 12Gb ddr3 Ram

Power supply: 650watts 80 plus bronze. 1 six pin and 1 eight pin

[Electronics Wizardy]

Yep your psu is fine. Assuming your spreading out the load fine, you can add the voltage from all the rails up.

[mariushm]

R7 260x uses up to around 95w ( 95w / 12 v = 8A)

 

The video card manufacturers suggest minimum 500w power supplies  or power supplies with at least 30A of current on 12v (30a x 12v = 360w) because a lot of crap power supplies with lower wattage lie about the maximum power and write bogus numbers on the sticker.

 

Your power supply has THREE rails, each capable of maximum 18A ( ~ 220w through each rail, think of each rail as a mini power supply inside the power supply).  You can see however that the total capacity through all three rails can not exceed 475w  ( 475w / 12v = almost 40A)

 

So since the video card uses up to 95 watts, which is less than what any of the three 12v rails is capable of, you can install that video card just fine and it will work perfectly.

 

[GER_T4IGA]

26 minutes ago, Electronics Wizardy said:

Yep your psu is fine. Assuming your spreading out the load fine, you can add the voltage from all the rails up.

Well does it work like that if the GPU is fed by one 6 Pin (+ PCIe slot) instead of multiple?

[Electronics Wizardy]

Just now, GER_T4IGA said:

Well does it work like that if the GPU is fed by one 6 Pin (+ PCIe slot) instead of multiple?

the gpu also pulls power from the slot, and thats often on a different rail, but normally one rail is for cpu, one is for mobo+ drives and one is for gpu, so this will work fine.