just bought the components for my first build:

  • MSI RTX 3080 gaming Trio Z
  • Ryzen 7 5800X (Without an IGPU)
  • Cooler Master MasterLiquid ML240L RGB V2
  • ASUS ROG Strix B550-E Gaming
  • PNY 3600MHZ 2x8gb RGB sticks
  • MSI MPG Series A750GF 80 plus gold PSU
  • Lian Li LanCool II mesh

I'm quite unsure of the motherboards power consumption but the GPU and the CPU consume from 512-475 (According to tomshardware the CPU can reach 142 watts) so will this system work fine or not.

  • 1
    Generally, you first ask for opinions here or r/buildapc, then buy components...
    – Irsu85
    Commented Jun 25, 2022 at 5:49
  • @Irsu85 I'm a noob in pc building so I just learnt about that ,I intuitively assumed that if I calculated the total power usage by adding the base wattage of each component individually it would give me an accurate answer , Luckily the power supply isn't delivered yet so will 850 watts be good if I'm not planning for near future upgrades nor overclocking ? Commented Jun 25, 2022 at 16:27
  • That is pretty lucky indeed. But don't overspec just a tiny little bit, PSU overspecing is generally better until 1.5x (also for efficiency and stability) so maybe 1000W is better.
    – Irsu85
    Commented Jun 26, 2022 at 7:08

2 Answers 2


Probably not. Since the RTX 30x0 series GPU's have a lot of high power draw spikes (up to 700W for the 3090, probably something like 600W for 3080), it is generally good practice to overspec your PSU by quite a lot. (Linus Torvalds generally does x2, I do about x1.8.) This means a 1000W PSU would probably be better, also when talking about upgradability/overclockability.


You should be fine with 750watts, I plugged in your parts list in PC part picker and the wattage was about 550 so a 750 is almost 200 watts more(counting in case fans and other peripherals) but if you want o be safe can go up a level to 800-850 watt PSU https://pcpartpicker.com/list/

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