400 Watt + ATI 5770?

Oh dear god not at all. A 400w QUALITY PSU would be pushing it at the very best. Stock PSUs are trash because thats where companies cut costs. I wouldn't trust a stock PSU to power anything. Here, get this and be happy.

http://www.newegg.com/Product/Produc...-006-_-Product

It may be overkill, but when you throw that gateway out (hopefully soon), and replace it with a custom machine, you will not have to buy a PSU. That PSU is good for years.

That card will work, unfortunately your power supply won't cut it. You could try using it and it would probably work, but it is risky and could be a gamble for your system. The likely out come is your power supply will fail a few months down the road and if it's crappy will overload your board and card on it's way out. Could result in fried MB, RAM and the new GPU.

Here is a link that says recommended power supply for 1x 5770 is 450W and 2x 5770 in crossfire is 600W. A total system under load with a 5770 uses approx. 256W of power.

If you don't have a second PCIe slot to crossfire and you don't plan on upgrading your computer anytime soon this is the minimum power supply to use. If you have the ability to crossfire down the road get a what Raptor Jesus recommended or a 650W

You want to use a quality power supply so you don't chance overvolting your equipment and frying things. Hope this helps

The 5770 uses just over 100w at full load. I doubt the rest of your system uses 300w, but you should get a quality 500w+ just to be safe.

hi all
whats your idea about my psu?
note:
cpu Q6600 G0 [email protected] auto voltage
my system is using 230w now (calculate from http://extreme.outervision.com/psucalculatorlite.jsp)
http://img192.imageshack.us/img192/8164/65516395.jpg

you need to check the amount of amps on 12v rail. 400w is maybe enough but without enough amps it'll probably fail. most psu have a sticker on it's side that shows the specification. the amount of amps usually shown just under the 12v+ column

The answers:
1. A 400watt psu will be good.
2. I know because I looked at corsair's power supply calculator.
3. Besides I have tested an hd4890, too. The hd5770 definitely uses half of what the other did.
4. Keeping cool pays off with digital power control chips. During operation, move the fan sliders up to benefit lower power consumption. Since the card uses low power, the easier it gets to keep it cool/quiet with +25% fan speed.

How many amps on the 12V rail? I have a 350W power supply and it powers my 4870 just fine with an overclocked Intel Pentium E6300. My power supply has 18A 12V rails (2 rails). The 4870 uses much more power than the 5770.

it might, if its a decent stock psu (ive noticed stock oem psu's aint 1/2 bad.. much better then cheapo ones im pointing to you sunbeam psu's)

A bit offtopic:
Would a 500W Chieftec PSU be enough for OC'ed 5770 980/1400 and i5 @ 4ghz ?
http://www.chieftec.com/smart-power.html GPS-500A

The card is limited to 110watts maximum and corsair says 400watts will suffice. 500watts is even crossfire achieavable if the 12v rails power rating is above 350watts imho.

I'm of the opinion that it will work just fine if it is a true 400w PSU.

Try to get us some amp numbers off the side of that PSU.

P.S. I really really wish that all of these GPU manufactures would come to some type of standard and start recommending AMPS and not WATTS. Because a 400w PSU that can put out 22 amps on the 12v rail is a whole heck of a lot stronger than a 500w PSU that puts out 16.

19amperes on any rail is the safety limit. Anything higher and the cables start overheating.

Start reading^^. You know cables can carry only some certain amount of electricity related to their diameters, don't you?

well if it is at least 70% pure, I'm sure it will run, since I can run a 3Ghz E4400, GA-G31M-S2L, 2 HDD and a 4850 512MB in a Silverstone Strider 400 and then am using FSP Saga II 400 for a 955BE, DFI DK 790FXB, and the 4850 512MB

@thread op.

I have a 400w PSU that ran an i5 overclockd slightly and both a 5770 at one point which I returned and got a less expensive gts250, and now I run a 5750 on it. Processor is overclocked and my video card is overclocked. You probably will be able to run your card with that PSU though I don't know what the potential of burning out your PSU down the road with that card is. If your PSU is a few years old I might consider getting a new one. It probably would be worth it.