Is there a way to estimate what PS I should get in terms of Watts?

[Siddhartha]

Is there a formula or easy rule of thumb to follow to determine what PS I should get?


TIA

Siddhartha

 

[lehtv]

Find out how much power your CPU and graphics card use at most, add 50W for the rest of the system, multiply by about 1.5x to be safe, round up.

Example: i5 CPU ~70W, GTX 970 graphics card ~180W, the rest of the system ~50W = 300W max load. 300W * 1.5 = 450W. A good quality 450W is sufficient. 500W+ is preferable for upgrade headroom, overclocking, and ensuring the PSU runs quiet. 550-650W is still not too overkill.

You also need to make sure the power supply has the necessary connectors for your parts, especially your graphics card's PCIe power connections.

Apart from watts, it's important to buy a reliable unit - capacity doesn't say anything about stability and longevity.

 

[Siddhartha]

Find out how much power your CPU and graphics card use at most, add 50W for the rest of the system, multiply by about 1.5x to be safe, round up.

Example: i5 CPU ~70W, GTX 970 graphics card ~180W, the rest of the system ~50W = 300W max load. 300W * 1.5 = 450W. A good quality 450W is sufficient. 500W+ is preferable for upgrade headroom, overclocking, and ensuring the PSU runs quiet. 550-650W is still not too overkill.

You also need to make sure the power supply has the necessary connectors for your parts, especially your graphics card's PCIe power connections.

Apart from watts, it's important to buy a reliable unit - capacity doesn't say anything about stability and longevity.

I am using onboard graphics. What about harddrives?

I was thinking about getting a CORSAIR RMx RM850X.

 

[lehtv]

RM850x is just stupidly overkill for onboard grahpics. Technically you'd be fine with a 150-200W unit - maybe even less, depending on your exact hardware - but ATX units don't really come in such small capacities, so just grab whichever good quality 300-400W unit is available to you. E.g. Seasonic G360 or S12II-350 or S12II-430.

I'm curious what your system is for and what other parts you plan on using.

What about harddrives?

Included in the "50W for the rest of the system". Hard drives don't consume much power.

 

[cybersys]

Is outervision reliable?

 

[Stuka87]

Is outervision reliable?

They can get you closer than guessing.

I suggest something like this:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151146

Seasonic makes very good supplies, and 300W is plenty for your system. Its even enough to put in dedicated GPU if you wanted (nothing high end, but lower to mid range).

 

[Siddhartha]

Thanks for the information. It looks like I am okay with the Cosair TX 750 w PS I am currently using.

Thanks again.

Siddhartha

 

[philipma1957]

Thanks for the information. It looks like I am okay with the Cosair TX 750 w PS I am currently using.

Thanks again.

Siddhartha

yes you are and nothing beats the price of $0 .

I have found that many upgrades are not needed.

I have a lot of parts sitting due to upgrades that did not offer much improvement.

 

[cybersys]

They can get you closer than guessing.

I suggest something like this:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151146

Seasonic makes very good supplies, and 300W is plenty for your system. Its even enough to put in dedicated GPU if you wanted (nothing high end, but lower to mid range).

Thanks. Newegg mentions it's CrossFire Ready. How can a 300 watt PSU be CrossFire Ready?