POwer supply unit

[anneat]

I need help with a power supply unit as I was told 750 watts was better to use my motherboard is a asus p5kpl-vmv and not sure if this will work

 

[Maarsch]

For just the motherboard (incl CPU, memory, HDD etc) you should be fine with a 300W, maybe even 250.

If you have 2 GPUs hanging of it you may need a 750W

 

[herrwizo]

It completely depends on your components. But mostly your GPU(s), and then your CPU. What is your build?

 

[raisonjohn]

I need help with a power supply unit as I was told 750 watts was better to use my motherboard is a asus p5kpl-vmv and not sure if this will work

The PSU wattage would depend on your other components (largely, dependent on the GPU) of your entire PC. You did not provide the other details, so, we can only make assumptions.

That Asus motherboard supports LGA775 socket 45nm CPUs. So, assuming your using a dual core or celeron CPUs, the max. TDP would be 65W. If you have the quad core, it'll be 95W max. TDP. If you have the extreme, it'll be 130W to 150W max. TDP.

The motherboard also has 2x DDR2 DIMM slots, running at 1.8V. So, if you have only one RAM stick plugged in, it'll consume around 3W to 4.5W. If you have two RAM sticks, it'll be twice that at 6W to 9W.

You also have a total of 4x SATA3 connectors in that motherboard. A typical 3.5" HDD would consume around 6.5W to 9W. Assuming you have 3.5" HDDs installed in all connectors, it'll consume 4 x 6.5W to 9W = 26W to 36W. Note that if you have SSD's, they consume much less.

The motherboard itself consumes very minimal power. But taking into account all other components that may be connected to it (like Wi-Fi modules, Sound Card, USB connectors, etc.), it'll probably consume around 30W additional.

There is also just 1x PCIex16 slot in that motherboard, specifically for your GPU. Now, considering the *probable* highest-spec'd GPU you can use without bottlenecking a Core 2 Quad, we'll assume you *can* use, either a GTX 750 or an R9 280. The GTX 750 consumes 55W max. TDP; while the R9 280 will consume a whopping 250W TDP.

So, *assuming* you have installed the most power-hungry components in that Asus P5KPL-VM motherboard, you have:
CPU (Core 2 Extreme) = 150W
RAM (2x DDR2) = 9W
HDD (4x 3.5" 7200rpm) = 36W
MB (all other connections) = 30W
GPU (1x R9 280) = 250W
TOTAL = 450W TDP Max.

This means at 100% (full) load, the max. TDP of your fully-filled-slots setup would roughly be around 450W. Since, typically, your PC won't be at full load 24/7, it may be taken as around 50% to 70% of that or 225W ~ 315W (depending on your actual usage), AND assuming you have filled up that motherboard with the most power-hungry components I listed above.

TL;DR
That 750W PSU is an overkill.

You can get by a 500W (or even lower wattage if you have less power-hungry components) using a high-quality and reliable PSU in the Tier 1 or Tier 2 category of this PSU Tier List.