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Is a 750w PSU overkill for this build?

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Power supply Master

For a system using a single GeForce GTX 660 (non-Ti) graphics card NVIDIA specifies a minimum of a 450 Watt or greater power supply that has a maximum combined +12 Volt continuous current rating of 24 Amps or greater and that has at least one 6-pin PCI Express supplementary power connector.

For a system using two GeForce GTX 660 (non-Ti) graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 600 Watt or greater power supply that has a maximum combined +12 Volt continuous current rating of 36 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the critical factor.

Overclocking of the CPU and/or GPU(s) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

The Corsair Professional Series HX750W ( SKU# 75-001218 / CP-9020031 ), with its maximum combined +12 Volt continuous current rating of 62 Amps and with four (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with a single GeForce GTX 660 (non-Ti) graphics card. It is also way more than sufficient to power your system configuration with two GeForce GTX 660 (non-Ti) graphics cards in 2-way SLI mode.

A good 450W PSU would be sufficient since you can't use two graphics cards in 2-way SLI on that motherboard anyway.
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Power supply Master

DyingLight said:
Thank you, how much room do you think I will have left?

Enough to overclock and also add a GPU. One thing to consider is that capacitors age over time and lose efficiency. And smaller PSUs tend to operate at a higher temp and this will also affect the efficiency.

On my most recent (3 weeks old) build around the i7 3770K I am using a Corsair AX850 PSU (I know that this is a little overkill, but the price was right). Factor in the price, not just the wattage of the PSU.

Ubrales said:
Enough to overclock and also add a GPU. One thing to consider is that capacitors age over time and lose efficiency. And smaller PSUs tend to operate at a higher temp and this will also affect the efficiency.

On my most recent (3 weeks old) build around the i7 3770K I am using a Corsair AX850 PSU (I know that this is a little overkill, but the price was right). Factor in the price, not just the wattage of the PSU.

Do you think this build is good to go?
Power supply Master

sek729 said:
Then there's no such thing as overkill if it's free :) . But yeah, If you ever decide to crossfire your 660, you already got the PSU for it.

The OP's motherboard only has one PCI Express x16 slot so there's not going to be any SLI or CrossFire going on.
Power supply Master

DyingLight said:
Do you think this build is good to go?

Yes, it looks good! The one thing that I would investigate further is the RAM. These days RAM is cheap enough to consider 16 GBs especially for a new build (then you will not need to upgrade down the road 6 months later).

sek729 said:
Then there's no such thing as overkill if it's free :) . But yeah, If you ever decide to crossfire your 660, you already got the PSU for it.

The only thing I am concerned about is whether or not the components will overheat. I currently have the HAF 912 case downstairs and I was told from a good friend that I should get two Cooler Master Megaflows that are 200mm for the front and the top. The front for intake and the top for exhaust.
Power supply Master

If you do decide to go for 4 RAM modules, check the clearance between the first module and the heatsink fan. On my build, I took a disc grinder and ground off about 2 mm from the lower portion of the fan. Now the clearance is fine.

Ubrales said:
If you do decide to go for 4 RAM modules, check the clearance between the first module and the heatsink fan. On my build, I took a disc grinder and ground off about 2 mm from the lower portion of the fan. Now the clearance is fine.

Okay thank you. As I said before, the only thing I am concerned about is whether or not the components will overheat. I currently have the HAF 912 case downstairs and I was told from a good friend that I should get two Cooler Master Megaflows that are 200mm for the front and the top. The front for intake and the top for exhaust.
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