400W power supply enough for this setup?

That will depend on the PSU. First of all, you will want to ensure that you have a 24-pin power connection on your PSU that will go to the mobo. There should also be a 4-pin power connection. What is the brand and model of your PSU? We can advise you better when we have that info.

Are you planning on OCing your system? The DFI boards can be a bit tricky to set up for the first-timer but for those that know their stuff, there are no better OCing boards than the DFIs. If you don't plan on OCing, go with the ASUS.

Thanks for your answer. Unfortunately I don't know the vendor as I bought it three years ago. There is also no brand sticker on the PSU so I guess it's noname. This is what my system looks like at the moment:[*:09a8eb5c1b]Pentium IV Northwood 2533 MHz
[*:09a8eb5c1b]Asus P4B533
[*:09a8eb5c1b]Kingston 512MB DDR266, Samsung 512MB DDR266
[*:09a8eb5c1b]GeForce 4 Ti4400 128MB
[*:09a8eb5c1b]Western Digital 120GB ATA133
[*:09a8eb5c1b]Maxtor 60GB ATA133
[*:09a8eb5c1b]NEC ND1100A@ND1300A
[*:09a8eb5c1b]Pioneer DVD-ROMThe PSU has a 20pin power connection and I thought about buying a 20- to 24-pin adapter if the it's powerful enough to handle my new setup. There is also a 4-pin power connection of course.

Currently I'm not planning to do any overclocking but maybe I will later? Actually the Asus board has everything I need but two friends of mine bought an Asus board (both were A8N variants) and both of them have problems with the fan cooling the south bridge (i.e. it refused to work after a short period of time). Although I always had Asus boards in the past and never experienced any problems with any of them...

Since you are going to go AMD 64 and use a DFI Ultra-D I would suggest you get a new PSU. Noname PSUs are not known for their stability and both the AMD 64 CPU and the DFI mobo will demand stability especially if you plan to OC at some point. My suggestion to you would be to go with either of these two PSUs:

Sunbeam NUUO 550W SLI-ready PSU...this is a modular PSU so you only use those cables you need. It is very stable and is powerful enough to handle any future additions to your system. Got very good reviews.

OCZ Modstream 520W or Powerstream 600W PSU.....more expensive than the Sunbeam but also better since it enables you to adjust your rail voltages...a big plus when you are OCing. The 600W may be overkill and i would only go with this if you plan on going with an SLI system. The 520W will serve you well for a long time if you can afford it.

I have news for you! 400W is enough for nearly any system right now! Today's top AMD systems pull around 240-260W, add another 30-60W for a similar performance Intel system. And by top, I mean SLI and the whole shebang. It would be possible to push that up another 40W with dual 7800GTX's rather than dual 6800 Ultra's...

The problem is, most power supplies start to destabilize at around 2/3 their rated capacity. Cheaper ones aren't very stable even at half their rated capacity. Hence many people recommend brand name 460W+ power supplies.

Right on. I have been running a 3.2 Prescott with 3 hard drives, 2 gigs of DDR Ram, an ATI X800XT-PE, DVD Burner, a TV tuner card and a PCMCIA reader with an 3 year old Antec TruePower 430 watt and it runs stable even with a 4% overclock on memory timings of 2-2-2-5.

BTW, I just ordered a $75 Antec TruePower 550 watt PSU for replacement, so I can use my old 430 in another build for the kids.

Okay, so both of you suggest buying a new one. The brands you mentioned are not available in the shop where I'm going to buy the hardware so what do you think about the Raptoxx RT-550WV1.3? I'm not really sure whether I still need a 20- to 24-pin adapter as it's ATX V1.3 - I couldn't find anything about it in the data sheet either. Price is at 43 EUR and I don't have any more money available...

Do not know of that brand, see if you can get a Fortron Source or Sparkle PSU. They have good products at reasonable prices. Should be able to get a 460 watt model for under $80 US.
JAS from me...

Okay thanks, I'll go for some new ATX2.0 550W PSU. I just guess we have other "popular" brands in Europe...

As you are on Germany, do not worry then about to purchase good PSUs:

Forget your local provider and go to http://www.alternate.de >> Energie >> Netzteile >> über 400 Watt

There you can get these brands: AOpen, CoolerMaster, Diverse, Enermax, Fortron, HEC, Intel, OCZ, Sharkoon, Silverstone, Tagan, Thermaltake, Zalman

USE E-COMMERCE! and do not permit that your local shop make you mad!

Regards

Dude, of course I'm going to buy the stuff online but definitely not at Alternate, they're too expensive. The same hardware costs about 100 EUR more than at Norsk-IT and I'm going to buy the entire hardware at the same shop. My favorite PSU from them is the LC-Power LC6550G 550W at the moment. If you find something better let me know - but I won't spend more than 50 EUR on the PSU. 8) Going to buy in about a week...

For the DFI mobo I would recommend a 550w psu....If you go to dfi-street.com and read they highly recommend a min of 480w psu with that mobo....I would do like other have said and go with something like:

Sunbeam NUUO 550W (great for the price).

One of the reasons that recommendation is made is because a lot of nF4 Ultra board owners get it specifically to OC like a bandit. When OCing you want some extra power buffer as well as a stable, high quality PSU.

true.... it makes sense to go ahead and get a decent psu that would be of service in the future as well....just something to keep in mind