6000x2 or 6400x2 ?

Im wondering Wich cpu i should use for a good computer
6400x2 ? or 6000x2
This Review Show that 6400x2 worth it apprently
http://www.tomshardware.co.uk/Phenom_9700-Spider_Platform-790FX,review-29761-28.html
But Does my CPU & Case can stand it i wonder. with my mobo
2GB PC-6400 Patriot Memory
7600GT XXX Edition
ASUS M2N-32 SLI DELUXE
Zalman CNPS9500-Cu P4/AMD/A64 Copper Cooler
400WATS powersuply With ATX P4 Case black if you ever heard of that case

I keep searching on forum from others website won't find my answer
fell like il have to ask some computer store to tell me if they know ... much about it wich i doubt

 

I want to config a rig with exact mobo like your's.And will buy 6400.ADVICE:replace your PSU,at least 500w or above.In the future maybe you will want to upgrade your comp.

 

so you say i need a better then 400 wats powersuply that mean i have to add +90$ for PSU how ever if none pro get here il may have to enter a new Tread Related to PSU wich psu should i buy ? the most noiseless * id rather and performent ? i see in sale Corsair PSU Are they any good ? or Should i stick to PSU of Thermtake care or OCZ or Eneremax Noise Taker Wich one would be
The Best Noiseless & Powerfull enough for good mobo

 

Firstly,I wrote-"In the future maybe you will want to upgrade your comp".You build a beautifull rig and she deserve GOOD PSU.Tha standard PSU that comes with the tower it's not with good quality-I don't think that if you can measure the total output,you will get 400W-(350W-maybe).this kind of PSU can't hold this type of highly consumable rigs.Look at my rig and you will understand what I want to say:http://forums.majorgeeks.com/showthread.php?p=1069357#post1069357
Look what Gimpster say about PSU:The bigger is better hype with powersupplies isn't very accurate.