my size on my ram is different in the proprerty o windows

[k0stas156]

i have crosshair v formula z with 2201 8350 with geil evo corsa 2133 mhz 8gb in my property of my computer the memory usable is 7.74

[Korth]

Some of your RAM is reserved for system firmware/hardware overhead. Windows can address 7.74GB of the 8.00GB installed memory.

Some system memory overhead is normal. Video paging buffers, ROM shadowing, BIOS extensions (bootloader/firmware code running on other hardware cards), running firmware (RAID drivers, USB drivers, SATA drivers, legacy drivers, RAM disk or memory manager software, network protocols, etc) can usually all be configured through BIOS settings.