[SOLVED] P7P55D-E Unrecognized Memory

Mar 27, 2019
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I built a PC 9 yrs ago, for a friend, with an Asus P7P55D-E mobo and 2 G-Skill 4Gb memory modules. This week, he called to say he ordered 2 more 4Gb modules and wanted me to install them. When I arrived, the PC was on, and I noticed that Windows 10 only recognized 4Gb. I powered off the PC. The first two modules were installed in slots A1 and B1. I installed the two new identical 4Gb modules in slots A2 and B2. Upon rebooting, the Bios only recognizes 8Gb. Windows Task Mgr says 8Gb in 2 slots out of 4 slots. I looked at the Asus mobo manual and it says I can install a single module in either slot A1 or B1. Using one module, I installed it in slot A1. The PC would not boot. I Installed it in Slot B1 and it booted fine. I am not sure if I need to press the Mem OK button and when. It says it will not work in the Windows OS so I assume you should only use it when in the Bios Setup Utility.
 
Solution
That motherboard can only support Dual Rank 4GB memory modules, Low density, double sided. ADATA ADDU1600C4G11,G.SKILL Value 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-1600C11D-8GNT or Discontinued Ballistix Sport 8GB Kit (4GBx2) DDR3 1600 MT/s (PC3-12800) UDIMM 240-Pin Memory - BLS2KIT4G3D1609DS1S00
Mar 27, 2019
5
0
10
Only half the ram is being recognized. Based on testing with individual Dimms, I am just asking if the mobo slot A1 could be bad? If I put Dimms in A1 and B1, the Bios only recognizes 4Gb..
 
That motherboard can only support Dual Rank 4GB memory modules, Low density, double sided. ADATA ADDU1600C4G11,G.SKILL Value 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-1600C11D-8GNT or Discontinued Ballistix Sport 8GB Kit (4GBx2) DDR3 1600 MT/s (PC3-12800) UDIMM 240-Pin Memory - BLS2KIT4G3D1609DS1S00
 
Solution