Aeacus :
What's your MoBo make and model?
But in general, i7-6700 will support up to 64 GB of RAM.
Do note that when getting new RAM stick, do get the same make, model and speed RAM as your previous stick is, just to avoid RAM compatibility issues between the two sticks.
Computer: Acer Aspire X3-710
CPU: Intel Core i7-6700 (Skylake-S, R0)
3400 MHz (34.00x100.0) @ 3789 MHz (38.00x99.7)
Motherboard: Acer Aspire X3-710
Chipset: Intel H110 (Skylake PCH-H)
Memory: 8192 MBytes @ 797 MHz, 11-11-11-28
- 8192 MB PC12800 DDR3 SDRAM - SK Hynix HMT41GU6BFR8A-PB
Graphics: Zotac GeForce GTX 745
NVIDIA GeForce GTX 745, 4096 MB DDR3 SDRAM
Drive: WDC WD20EZRX-22D8PB0, 1953.5 GB, Serial ATA 6Gb/s @ 6Gb/s
Drive: Slimtype DVD A DA8A6SH, DVD+R DL
Sound: Intel Skylake PCH-H - High Definition Audio Controller
Sound: NVIDIA GM107 - High Definition Audio Controller
Network: RealTek Semiconductor RTL8168/8111 PCI-E Gigabit Ethernet NIC
Network: Atheros/Qualcomm QCA6174 802.11ac Wireless Network Adapter
OS: Microsoft Windows 10 Home (x64) Build 15063.674 (RS2)