is 400 watts PSU enough for 260gtx , 4870, or GX2???

OH!! another question:

Which card should i buy?
I play game at 1900*1200 and AA and AF is a must.

My opinion according to recent release of Tomshardware article, It shows that 260 has better framerate than other contender at 1900 with AA.

No, unfortunately that PSU isn't going to cut it for such high end cards. Look into something more powerful like the Corsair TX650. If you're on a tight budget you can get by on something like the Antec earthwatts EA500.

At that resolution you should look into either an HD4870 or GTX260. They perform very close to each other, and I generally recommend the 4870 as it slightly edges out the 260 overall. However, there are some killer deals on GTX260s out there, so if you can find one on the cheap it's a perfectly viable option.

2 say yay and 1 say nay..........

I hope and believe it would, but as kari said "But running a PSU at close to the max wattage isn't a very good idea, you'll get lower effiency, more noise and it puts generally more strain on the PSU's components that might shorten its lifespan." giving a lot of though.

would too low of watts in PSU has affect on how video card performance? Does it perform slower?

Homerdog's answer is very helpful too, so in the worst case cenerio, I really dont want to spend money on the new PSU, but I like to know which video card to get the will be compatible with my PSU while I can play game on 1900 with AA?

Good little Power Supply. Well the Radeon 4870 requires like 130W while the 260 needs about 140W, all tho overclocked version will consume a little more. You may be able to get away with using that Power Supply, but it would be pushing it. If you are pushing that power supply to it's limits it will make a high pitched wine. If it is pushed too hard or overheats it will turn itself off so that it won't fry everything. If that happens you will need a new PSU, don't try and turn it on again right away. That said you should be able to get a 4870 and run it just fine. If your PSU can handle it then it will run just fine, if not it will shut itself off.

if you do not have enough STABLE power to a GPU, it will cause crashes and even cause the video card to underperform.

with your setup, you should go with a 600W and up PSU, preferably an 80PLUS certified PSU.

400 watt won't cut it, as mentioned above it might work but not for long.

Those vga cards each require two pci-e 6 or 6/8 pin connectors. Your referenced card has only 1. It won't work.

Normally, a 400w PSU would be enough, but seeing as yours is fanless, I'd be careful. No fan means more heat that needs to be endured. In the past, some manufacturers of fanless PSUs have been a bit optimistic about how much power their creations can reliably sustain without getting a heatstroke.

@ Magic bullet

Your PSU would give out 22.5 AMPs and comes with one PCIE power cable.
The 4850 only requires the one power cable and would be the best way to go in my opinion. I would be VERY surprised if you could run any of your listed cards on that psu.

Mactronix

The GTX+ needs 2 power leads and you have 1 you can use an adaptor to make another one out of two standard 4pin molex connectors if you have them spare and want to go that route but i personally dont think your PSU would be good enough. As i already posted i would stick to a card that only needs the 1 connector your PSU has and for my money the 4850 fits the bill perfectly. Waiting is always a tricky one to advise on as you yourself are the only one who knows how well, or not your machine is performing. If you can wait then wait, if your rig is crying out for more performance then get a new card.
I havent heard and concrete dates yet for new releases.
Mactronix

You putting down approx $300 for a video card and you questioning about a $50 400watt PSU.

400watt will turn it on and runs it idle. If you like random crashes and reboots; go ahead.

Spend $100 and get a decent 650watt. duh. I dont want to be a jerk but some forum topic is like a slap in the face.

I just assembled a new system. I was debating the same graphics cards that you are and finally ordered the Geforce 9800 GX2. I paid $249 after rebate and this card will out perform the other two cards, Google any of the newer card reviews (if you google the 9800 GX2 those tests are older with immature drivers and not a true representation of the cards capabilities) where the 9800 GX2 is included in the test....the 9800 GX2 runs at or near the top on nearly every test.

I would replace your PSU with a new one. The Corsair 650 W is a very nice unit and will have the "juice" necessary to power any signgle video card on the market.

This thread is over 7 months old.

You run your computer like an idiot Krisando.