GA-p55a-UD3 not seeing 8GB Memory

[Dward]

Hi there,

My specs are:

Motherboard: GA-p55a-UD3 (Not sure if revision 2 or 1) Bios version F11
CPU: i5 760
Memory: Before: G.Skill 4GB (2x2GB) kit, PC-12800 (1600Mhz), 6-8-6-24-2N , Dual Channel Kit (F3-12800CL6D-4GBPI)
New: G.Skill 8GB (2x4GB) Kit, PC-12800 (1600Mhz), Ripjaws, 8-8-8-24-2N, Dual Channel Kit (F3-12800CL8D-8GBRM)
PSU: Corsair CMPSU-650HX 650W

I ran the old 2x2GB sticks for a few years with out any issues at all. I recently purchased the new sticks to take me up to 8GB. I took out the old sticks and installed the new sticks in to the same slots. I rebooted to see the bios/windows only telling me I have 4GB installed.

I run the sticks at their rated 1600Mhz @ 1.6V.

I have downclocked the memory and voltage to 1.5V, no change. I have enabled the XMP, no change.

I took one stick out and rebooted, the BIOS said I have 2GB installed. So it is only reading the two sticks as 2GB each, where as they should be 4GB each. The label on the memory sticks definitely reads 4096mbx2.

I updated the BIOS to F11, as I only had F9 installed. Still no change. I updated it with the revision2 BIOS, however I'm not sure if I have rev1 or rev2. Does that matter?

I have run out of other things to try? The G.Skill website lists the ga-p55a-ud3 as a compatible motherboard: http://www.gskill.com/products.php?index=318

Any thoughts?

Sreenshots from CPU-Z:

^^That part number is a concern

Thanks

Dward

 

[Dward]

UPDATE: found out it is a revision1 motherboard. I have flashed the revision1 F11 BIOS, still reads the sticks as 2x2GB

 

[Meghan54]

Good luck with that motherboard.

Wife had the same exact one in her computer. (Actually hers had a very similar setup to yours.....Corsair 620HX power supply, i5 750.) Never a problem with recognizing memory, but for some reason hard drives would die unexpectedly and quickly when connected to it.

Lost two WE Blue 500GB drives and one WD 1TB Black....all new when attached. One was just two weeks old when it became unreadable. Have never seen anything like it before or since.

Replaced it with another 1156 board and everything's working fine now. I'm starting to wonder if Gigabyte rushed a bit putting this board out just to one of the first with USB3 ports (one of this board's "claims to fame".)