PSU problem and upgrade

Bill Bard · May 14, 2014

Hello,
Yesterday, I bought a new gpu and a new ssd in order to upgrade my gaming pc. The vendor told there's no problem with my current PSU, but as you can imagine my PC doesn't even start! I have to unplug the dvd in order to boot... My computer's current specs are:

Cpu: i7 @3.4GHz 2nd gen
Gpu: Gigabyte gtx 760 x3 oc 2gb
PSU: 550W
Hard drive 1: samsung pro 840 128gb
Hard drive 2: 1TB HDD @7200rpm
RAM: corsair vengeance 2x4gb @1600MHz
DVD RW

Questions:
1. What's the sufficient (minimum) power my computer need in order to operate properly? (gaming)
2. There's a chance to go for an AMD processor in the future. For example, FX9590 needs at least 200w to operate. Is the ps calculation a rough sum of the component's minimum requirements plus a fixed amount?
3. Any PSU suggestions - value for money - in both scenarios (questions 1 and 2 respectively)?

PS1: I'm already out of budget
PS2: Sorry for my bad English, it's not my native language.
PS3: Sorry if you feel that I didn't do a small research before, but it's a bit difficult to search properly from a smartphone...

Thank you in advance.

Plusthinking Iq · May 14, 2014

1. 250w if you buy a good psu, but 400w to keep psu at about 50% at gaming levels.
2. amd fx 9590 need at least 250w alone and a good cpu cooler. just get a i5 4690 if your gaming.
3. Cooler Master V450S is great.

Bill Bard · May 14, 2014

Plusthinking Iq :

bump. Thanks for the answer but I've already had a 550W PSU on my PC and it is not enough for my new GPU. According to the GPU manufacturer, the power supply requirement is 500W. Is a 700W psu good enough? What's the actual difference between an expensive 700W PSU and a 1000W cheap PSU on the system I described above in terms of reliability? I need a cheap but in the same way reliable unit for now (don't really care about electricity bills). Any suggestions?

GPU specs: http://www.gigabyte.com/products/product-page.aspx?pid=4663#ov

jimthenagual · May 14, 2014

550W should be plenty for your system. If your PSU can't power your graphics card then there must be something wrong with the PSU. Either it is not providing the number of watts/amps it says it is (cheap PSU), or it is defective.

What make/model is it?

You say that if you disconnect the DVD drive, the system starts?
And finally, just to confirm, you said you have "Gigabyte gtx 760 x3 oc 2gb". The "x3" doesn't mean you are running triple cards right? It means the triple fan cooling on the windforce models? Just making sure!

Bill Bard · May 14, 2014

jimthenagual :

At the moment a technician has my PC in order to give him an other PSU to install, so I don't have exact information of my current one. However, I'm pretty sure it is one of the cheapest PSU of its level, because it was in the initial package of my desktop.

Indeed, I disconnected the DVD drive and the system starts and you are right, "x3" is the version with triple fan cooling.

Dark Lord of Tech · May 14, 2014

Your choices for the 9590:

ASRock 990FX Extreme9
Asus Crosshair V Formula-Z
Asus M5A99FX PRO R2.0
Asus Sabertooth 990FX R2.0
Gigabyte GA-990FXA-UD3
Gigabyte GA-990FXA-UD5
Gigabyte GA-990FXA-UD7
MSI 990FXA-GD80V2

AMD.COM

Warning: This power draw of this CPU is almost twice that of the average CPU. Due to this, AMD recommends using at minimum a 1000W power supply. For cooling, AMD recommends using either either closed loop liquid cooling or full system liquid cooling.

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