PSU Is it safe

Thesweatyninja · Dec 21, 2013

I am building a build with a 7990 GPU all of my other parts come to around 653w area is it safe for me to use a 750w power supply as I am kinda push the money for a 7990 at £435. thank you here is my build if it helps http://uk.pcpartpicker.com/p/2nIl2

epicoverclock · Dec 21, 2013

yes, Its a good power supply. power supply calculator sites overstate the amount of wattage you will need in case that people will be usin cheap generic power supplies.
with that power supply you will still have some headroom for future upgrades, in fact its more than enough for now

epicoverclock · Dec 21, 2013

as to ram, i would choose 2x4gb sticks instead of 1x8gb stick so that they run in dual channel mode

Thesweatyninja · Dec 21, 2013

Okay man thank you. Il get 2x4 sticks of RAM!

Devballs · Dec 21, 2013

This is what AMD recommends:
■750W (or greater) power supply with two 150W 8-pin PCI Express power connectors recommended ◦1000W (or greater) power supply with four 150W 8-pin PCI Express power connectors recommended for AMD CrossFire™ technology in dual mode.
◦NOTE: Minimum recommended system power supply wattage is based on the specific graphics card and the typical power requirements of other system components. Your system may require more or less power. OEM and other pre-assembled PCs may have different power requirements.

However, I know people say that XFX, Seasonic or Corsair (not CX) are the better PSUs out there, make sure they are 80+bronze rated at least. Although personally I always like to give my PSU some headroom for piece of mind.

epicoverclock · Dec 21, 2013

sorry, i misread your post, i though you meant amd 7970.
but yes 7990 will work with this power supply,

Thesweatyninja · Dec 21, 2013

I see I have just been looking at the 8350 which is £100 so I am going to get that instead of a i5 but it takes up to around 705w Soo I'm not to sure if a 750w is good enough I might get a 800 80+ one, but thank you for the help you guys! Here is the 8350 build http://uk.pcpartpicker.com/p/2nIvv

juanjostorreshernndez · Dec 21, 2013

Radeon HD 7990 - requires 48A and a 750W psu minimum, and has an elevated max TDP of 375W.
Your PSU is on Tier3 list so STILL A SOLID UNIT,http://www.eggxpert.com/forums/thread/323050.aspx I think you should be fine. but really tigh on global power consumption, reducing your PSU lifespan considerably, so I recommend something more like a better branded certified 850W PSU like Seasonic, XFX, Corsair, Antec, wich gives you more headroom for your built

Related to RAMs I agree with epicoverclock, you should get a dual channel 8GB 2x4GB Kit for better performance. Something like G.sKill, Corsair.

epicoverclock · Dec 21, 2013

i5-4670 will be faster in most games. the 8 core fx-8350 would be better at multitasking and rendering due to having more cores

Thesweatyninja · Dec 21, 2013

I've been hearing games are starting to make the most out of the 8 Cores on the AMD 9350 but I'm not to sure about it I'm also try to keep the cost as low as I can. but is it a big difference between the 4670 and the 8350 for the extra £50?

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