So yeah , can we trust them ? I'm building a new system and when i max everything it says i need 400 watts , so am I safe to buy a cooler master GX450 ?
To a degree you can trust them, but it would be good to double check that the GPU+CPU doesn't consume more than your PSU's 12v rail will supply. You have a 50watt buffer zone over the requirement, which should be fine.
If your concerned though, you should list your specs. Worth noting that I have heard bad things about cooler master psu's, but I haven't ever used one so I'm just parroting somebody; Seasonic are nice PSU's as and I've heard good things about Corsair.
It doesn't hurt to have a few extra watts if price isn't a major concern, but don't sacrifice quality for extra power if you are cost constrained.
Yes, but the condition is that you don't oc your cpu and video card. Even the GX450 is 80 PLUS BRONZE Certified but it is not good enough. Check the link you know why it is not good enough because if they tried to pull more than 450 W the unit would immediately shut down.
For most good PSU (Antec, SeaSonic, CORSAIR, and XFX, etc) you can pull more power like maximum power, like Antec High Current Gamer 520 W, but the maximum power is 633W.
My build will consist of :
Asus sabertooth 990fx
Amd fx6100 @4.3 + cooler master hyper 212
Asus eah6850 v2(hd6850)
2x4gb mushkin redline @1866mhz
Mushkin chronos 120gb ssd
case will probably be thermaltake v4 with 3-4 fans
no hdd, no dvd drive...
What do you think ? Which psu (watts(quality watts ))?
If you don't have HD and DVD, and if you OC your cpu @4.3 Voltage 1.4-1.5V ( i guess) plus 6 Fans (4 + 2 in hyper212) no OC HD6850, then I will say the GX450 should be good to go, by the way HD6850 is low power draw.
the calculators only work to a certain level. they are still not a human.
The main reasons for calculators to be wrong is bad data, bad code and bad assumptions for which humans are responsible 99.9999% of the time.
A true 450W PSU (rated for 450W continuous power and actually able to deliver it) can power quite a bit of hardware but a long history of generic PSUs failing to deliver anywhere near their rated outputs has made people really wary of getting anywhere near 100% load on PSUs along with over-inflated PSU recommendations from GPU manufacturers. Because nobody can trust anybody, we end up with 700W power estimation for a 300W system.