So here is the short story: I have 4GB of Ram (2x2GB Gskill Ripjaw series) installed. Yet, Ubuntu only recognizes 2GB, Windows recognizes that 4GB is installed, but only 1.99 useable, and the BIOS says that there is 4GB installed. On Windows, running idle, over 1GB of RAM is being used, leaving me with a paltry 1GB left to do anything with. I have an Intel Core i5 750 @2.67Ghz proc and an MSI P55-GD65 mobo, and there is no memory remapping feature. I have an ATI Radeon HD 5750 1GB graphics card.
The RAM is good, I have switched it around, it is in the appropriate channels. Attached are screenshots of performance manager, device manager, and cpu-z. If anyone can help I will sincerely appreciate it! I am VERY bad at converting hex, so am unsure how to read the memory management screenshot, but it should hopefully help identify where all my memory is going.
Additionally, I reran the Windows rating system, and my CPU score dropped from 7.1 to 4.7...is there any way to test if there is now a problem with my CPU? My BIOS settings are Optimized Defaults. I tried generating a system health report, but only the summary would show I could not view any details.