I am looking on purchasing new GPU and i have Corsair VX550 (http://www.corsair.com/products/vx/default.aspx) and my system specs are AMD Phenom x4 9550 with 4 GB of 800MHZ RAM and 500 GB Sata HD and some sata dvd burner and my mobo is Asus M3A..
So my real problem is that can i get the 4870x2 even tho ati page says that my psu cant handle it i don´t want to get the 280 but it looks i might hafta get it
What do you guys think?
My bad. I said "you should get a new PSU". I should have been clearer. It will work, just not in the optimal range of the PSU. It's not a very good idea, especially for the long term, but it will work anyway.
Video card manufacturers tend to pad their minimum PSU recommendations, to make sure they get fewer support calls and also to make the PSUs work at 70% or less. That's important because after about 70% load the PSUs start working less efficiently and the noise/heat/electricity bills go up. That in turn hurts the video cards and other parts. Also, PSUs tend to weaken in time (because of capacitor aging).
Try it, why not. Anandtech reviewers built this system and it consumed 407W under load:
QX9770 @ 3.20GHz, Intel DX48BT2, HD 4870 X2, Seagate 7200.9 120GB,
4 x 1GB Corsair DDR3-1333 7-7-7-20, Vista Ultimate 64-bit SP1
Your PSU can deliver 41A*12V=492W. It should be able to handle that. I'm assuming you're not going to have a lot of hard disks, TV cards, fans, lights, etc, because then you might push the PSU too much and it will shut down.
And to add more fuel to the fires; ATI reccomends the TX650 (52A 12v) as the minimum Corsair supply for the 4870X2, which gels with AEVMs` calculations.
I would strongly advise you to accept the advice of AVEM and upgrade your PSU if you intend to use either of the cards you mention.
Your psu has two pci-e connectors, one 6 pin, and one 6+2 pin. A quality unit will be able to power those connectors to their maximum power draw. Corsair is a quality unit. You can buy either vga card.
A psu operates most efficiently in the middle third of it's capability. If it needs to operate near the top of it's range, it will become less efficient, the fan will spin up and get noisy, and on a poor quality unit, the power will fluctuate out of spec.
I suggest that you try the 550vx. As suggested before, the VGA vendors recommendations are very conservative; in part to account for older or poor quality psu's.