wich one is the better both with a speed of 2.8?

Phenom is faster clock for clock.

ok then next question would be what asus mobo's will work with the new phenom X2 i have a MA78-EMH HDMI and cant find any info on if it will support the cpu or not and if not will the ASUS M3A78-PRO or
GIGABYTE GA-MA790X-DS4 work with it and is there going to be a 3.0 or 3.2 in the PhenomX2?

i would definitely get the asus over the gigabyte in this case.
both boards will support the phenoms and newer.

also, assuming http://www.asus.com/products.aspx?l1=3& ... odelmenu=1 is your current board then you won't need a new motherboard to support the cpu in question here. you may just need a bios update.

yes both boards will support am3. I also agree with asus over gigabyte. the m3a78 is a good board, and also has more sata ports than the gigabyte board. (i think, im not a 100 % sure)

the asus seems to have 6 sata ports where the gigabyte only has 4

also, my reason for saying the asus over the gigabyte is simple. google up "ga-ma790x-ds4 catch fire" and you'll see. the problem only seems to happen with 125W+ cpus though as i have that gigabyte board and an X2 5200+ and it's working perfectly fine.

Gigabyte isn't alone in the fire business though. Many AM2 boards won't handle a 125W cpu. Even Asus's ones that claimed to, have been pulled from the approved list. I'd go with the latest chipset to be on the safe side.

this much is true, one of the 790X chipset based MSI boards has the same problem as the gigabyte board in question. it's just odd that for the MSI board i mentioned the solution was to simply add a heatsink over the mosfets...
hell, my board has the outline for where a heatsink is supposed to be, yet there's no heatsink in sight.

OK then if not the gigabyte then MSI K9A2 CF-F Socket AM2+ for crossfire then? and as for cpu im only planning on running dual core 2.8 to 3.2, but im guessing if i want dual x16 the only board for amd in an asus is gonna be M3A79-T Deluxe 790FX+SB750.