Hi welcome to the forums...
That mobo is a pretty good choice and should be fin, its essentially the same as the M3A79-T which is a very popular mobo in its own right for Phenom systems...
Everyone has their own particular favourite brand of mobo, some like gigabyte, some like DFI, my own personal preference has been ASUS. Like any maunfacturer it has its pro's and con's.
The M4A79 mobo should be perfectly adequate for your needs... there are some subtle diffrences between the M3A79-T and the M4A79, like the placement of the SATA ports, I prefer the arrangement on the M3A79-T as I use crossfire and RAID-0, some gfx cards can block some of the SATA ports on the M4A79 which could be a potential problem for some, as it limits the available number of SATA ports... So given that you intend to crosssfire the 4870's in the near future you might want to take the SATA ports into consideration when assembling and try to avoid using the SATA ports that are flat to the mobo, when installing your HDD's, DVD-RW's etc...!!!
I think you'll be OK gnereally for standard Crsossfire when using 2 Cards, it generally seems to bewhen using the 2nd PCI-E slot with double slot gfx cards that is a potential problem, as this blocks 2 of the 3 flat SATA ports, if you install the 4870's to the 2 Blue slots, the preferred arrangement... then you should be OK.. make sure to keep the Crossfire Coneectors that come with the mobo safe as well, as you'll need these when using Crossfire, as they are loinger than the standard Crossfire connectors that come with gfx cards, the longer connectors are needed to allow the connecctors to span the gaps between the PCI-E slots on the mobo.
In terms of compatability with the PII 940BE and DDR2-1066 RAM, then you shouldn't have a problem...!!!
If 4GB of RAM is what you prefer I'd recommend getting the 2 x 2GB kit, rather than the 4 x 1GB kit, this will place less load on the Memory Controller, having all 4 DIMM Slots filled can sometimes cause a problem, it seems it depends on the RAM used, some people have problems with DDR2-1066, others don't....
Speaking from my own experience, I use 2 x 2GB G.Skill PC2-8500 DDR2-1066 RAM on my M3A79-T mobo without too much trouble.... you will likely need to manually configure the BIOS settings to get the mobo to run the RAM at its rated speed, by setting the RAM Speed, timings and voltage correctly, but this is easy to do...!!!
Good luck with your new build..
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05:53 AM by