4GB+ Memory Size : 768MB POST2

On bootup POST2, i just noticed today that it says "4GB+ Memory Size: 768MB"
what does this exactly mean?

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<<< System Summary >>>
> Mainboard : Asus M4A79XTD EVO (BIOS v0704 Date 11/25/2009)
> Chipset : AMD 790X
> Processor : AMD Phenom II X4 955e C2 @ 800 MHz (Cool-n-Quiet On)
> Physical Memory : G.SKILL Ripjaws 4096 MB (2 x 2048 DDR3-SDRAM ) F3-12800CL9D-4GBRL
> Installed : DIMM 1, DIMM 2
> Timings : 1600mhz @ 9-9-9-24-2T 1.50v (DRAM Freq 800.0 mhz, FSB:DRAM 1:4, NB Freq 2000.0 mhz)
> Video Card : XFX ATI Radeon HD 4850 1GB GDDR3
> Hard Disk : WDC WD1600JB-00EVA0 (160 GB) IDE Ultra ATA100
> Hard Disk : WDC WD5000AAKS-00V1A0 (500 GB) SATA 3.0Gb/s
> DVD-Rom Drive : QPQ OPERCHUBS SCSI CdRom Device
> DVD-Rom Drive : QPQ OPERCHUBS SCSI CdRom Device
> DVD-Rom Drive : ASUS DRW-24B1ST SATA Device
> Monitor Type : HF199H - 19 inches Wide-screen (1440x900)
> Network Card : RTL8168/8111 PCIe Gigabit Ethernet Adapter
> Operating System : Windows 7 Ultimate Professional 6.01.7600 (x64)
> DirectX : Version 11.00
> Windows Performance Index : 5.9 on 7.9
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  1. anyone happen to know? because i'ts not in my motherboard manual, i've searched the PDF etc
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