Do I need a new Power supply?

The_Distinct · Feb 5, 2014

Please can someone help, I just installed a new CPU (AMD FX8320) and a new graphics card (XFX AMD7970) and I wanted to now if a 500 watt PSU is enough to keep it running. The reason is because after I installed my new CPU my computer screen started going black after it Says starting windows. The numlock light flashes after I press any key on the keyboard.
MOBO: msi 760gm-p23
Please can someone help.
Thank you.

4745454b · Feb 5, 2014

What 500W PSU?

davcon · Feb 5, 2014

You'll need a high quality 550W unit minimum.
http://us.ncix.com/products/?sku=59615&vpn=P1550SXXB9&manufacture=XFX&promoid=1101
http://www.guru3d.com/articles_pages/radeon_hd_7970_ghz_edition_review,8.html

The_Distinct · Feb 5, 2014

4745454b :

It is the Corsair CX500 watt Model

davcon · Feb 5, 2014

A non overclocked Amd 7970 draws @40a your psu is rated at 38a.
Personally I would buy a good 650W unit.

The_Distinct · Feb 5, 2014

davcon :

Would this solve the black screen issue on start up?

4745454b · Feb 5, 2014

Davcon ? If the 7970 draws 40A and run on 12V power you think it really uses 480W? It's a 250W card. Add in another 125W for his CPU and we are up to 375W. Probably around 425W total system draw unless he has other things in there that aren't common. This is pretty much the max for the CX500. I'm a bit surprised it has an issue. Doing the math looking at it from newegg is has 38A, or 456W on the 12V rail.

I find it more likely that your CPU isn't supported. Here is the CPU support list for your board.

http://www.msi.com/product/mb/760GM-P23--FX-.html#/?div=CPUSupport

Notice that the 8320 isn't on the list, and the FX CPUs that are there are all 90W or less. My guess is you need at the very least a bios update, but I'm pretty sure your board (760?!) can't handle that CPU.

davcon · Feb 5, 2014

More than likely since your current psu doesn't have the required amperage to power the gpu.
4745454b is right!
The combo of your cpu and gpu is taxing the CX500.

The_Distinct · Feb 5, 2014

4745454b :

Davcon ? If the 7970 draws 40A and run on 12V power you think it really uses 480W? It's a 250W card. Add in another 125W for his CPU and we are up to 375W. Probably around 425W total system draw unless he has other things in there that aren't common. This is pretty much the max for the CX500. I'm a bit surprised it has an issue. Doing the math looking at it from newegg is has 38A, or 456W on the 12V rail.

I find it more likely that your CPU isn't supported. Here is the CPU support list for your board.

http://www.msi.com/product/mb/760GM-P23--FX-.html#/?div=CPUSupport

Notice that the 8320 isn't on the list, and the FX CPUs that are there are all 90W or less. My guess is you need at the very least a bios update, but I'm pretty sure your board (760?!) can't handle that CPU.

So I will need to buy a new motherboard and psu?

4745454b · Feb 5, 2014

I would try a new board first. You should have just barely enough power. Don't OC anything. New PSU as you get money. Your board only supports max 95W CPUs and yours is 125W. Hence the black screen on startup.

The_Distinct · Feb 5, 2014

4745454b :

Which motherboard would you recommend for gaming?

4745454b · Feb 5, 2014

One of the 970s should be fine. Asrock, Asus, Gigabyte, perhaps MSI. Get a 990 if you will be using CF or OCing a lot.

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Do I need a new Power supply?

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