GA-78LMT-S2P Rev5 Ram issues

[midnight109]

MicroCenter had this Board and FX4100Black CPU on a bundel price so I went ahead and got it.
Got 2, 4GB Corsair Ram chips, 9, 9, 9, 24, 1.5V, Ploped them in, but the BIOS only sees half the ram.
With Both Chips installed I have 4GB, if I install 1 chip at a time it sees 2GB each no matter what order I put them in.
I double checked the memory sticks and thier DDR3 1333 4GB chips, this is the ram im using

http://www.microcenter.com/product/347304/XMS3_Series_8GB_DDR3-1333_(PC3-10666)_CL9_Dual_Channel_Desktop_Memory_Kit_(Two_4GB_Memory_Modules)

It has a FX4100Cpu, 600Watt PowerSupply, a PCI-e nVidea 8400GX, a Firewire PCI card, 120GB SSD, and a 500GB SATA2 HD, running Windows7x64
The bios I updated to the beta F5
In the bios I changed from Perfamance to FailSafe, changed everything in thier I could think of but still only sees each chip as half of what it is. Windows Runs, but could use that extra ram for all the compiling/processing we use the system for. Money is tight so looking for ideas on What to try, should we get another set of ram to see if it works, maybe the board dosent like that ram, is it a bios setting, or what could be a issue making half the ram vanish?
Tried pulling the Video and Firewire out, leaving all slots empty, same thing, just around 3.75GB ram total after it uses 256mb for the onboard video.

[autotech]

I would double check the ram. Wouldnt be the first time i have seen rtam mis marked. count the chips on it and google the model# it has on sticker. Sure sounds as if they are 2 gig chips not 4.

[Vezina]

You could send the RAM back if it doesnt work and get a maximum of 4 Gigs.
It is very possible to have a board limitation regarding the RAM stick architecture.
But before that install each stick  in each slot of the motherboard one by one and see if works.


Personally I would send the board and CPU back and get an APU like 5600K/5800K/6600K/6800K with some AMD FM2 A75 board and overclock them.
In this way the probability for the  RAM to work would be higher.
Any of the APU s i have enumerated are better than the FX 4100 in performance and overclockability and the power consumption would be lower.
The GPU side from the APU would be better than the video card you are having as well.
Furthermore i would exchange the RAM with 1600Mhz/1866Mhz RAM sticks