Naw, it would only just breach 530W on a high end system with a couple 4890s. Though if buying two high end cards, I would spend a little extra on the PSU…
I suggest this build if possible:https://techreport.com/articles.x/17571/4
Don’t worry about or corssfire…at this point it’s not really needed unless you have a super huge screen…which you don’t.
Here is the one I’m building a friend right now…variant of the one above:
CPU: Intel Core i5-750
Mobo: MSI P55-GD65
Ram: Patriot Extreme Performance DDR3 1333MHz 4GB (2x2GB )
Video Card: Sapphire ATI RADEON HD 4890 1GB OC
HDD : Western Digital Caviar Black 1TB