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Black E-ATX motherboard with gold accents, LGA 2011-v3 socket, four DDR4 slots, multiple PCIe x16 slots, rear I/O shield included

MSI

MSI X99S GAMING 9 AC Intel motherboard

SKU CH-YB0M-5VMFX

Supports Intel Core i7 CPUs on LGA 2011-v3 with four-channel DDR4 up to 128 GB, five PCIe 3.0 x16 slots, 10 SATA III ports, Killer E2205 LAN and Realtek ALC1150 7.1 audio

  • CPU Socket TypeLGA 2011-v3
  • CPU TypeIntel Core ™ i7 processors with new LGA 2011-3 slots
  • ChipsetIntel X99
  • Memory StandardSupports four-channel DDR4 2133/2200 (OC)/2400 (OC)/2600 (OC
  • Maximum Memory Supported128GB
  • PCI Slots5 PCIe 3.0 x16 slots, supporting 4-way mode - 1-way mode: x1
  • Supports up to 128GB DDR4 for heavy multitasking
  • Four-channel DDR4 at 2133 MHz with OC headroom to 3333 MHz
  • Intel X99 chipset on LGA 2011-v3 socket for Core i7 CPUs
  • Five PCIe 3.0 x16 slots enabling four-way GPU configurations
  • Realtek ALC1150 delivers 7.1 channel audio with S/PDIF output

LGA 2011-v3 Intel X99 motherboard

This MSI X99S GAMING 9 AC board targets enthusiasts building high-core-count systems on the LGA 2011-v3 platform. The Intel X99 chipset enables four-channel DDR4 memory up to 128GB with overclocked speeds reaching 3333 MHz. Five PCIe 3.0 x16 slots provide flexible multi-GPU configurations up to 4-way mode.

Realtek ALC1150 audio and Killer E2205 LAN

The Realtek ALC1150 codec delivers 7.1 channel high-quality sound effects with S/PDIF output support. A single Killer E2205 Gigabit network interface card handles wired connectivity. These integrated controllers operate within the board's standard power envelope without requiring active cooling on the chipset heatsink.

Back-panel I/O shield and WiFi antenna included

The retail package supplies a chassis I/O back panel, one SATA cable, a CMOS battery and a WiFi antenna for the onboard wireless module. No additional brackets, SLI bridges or fan hubs are bundled. Builders should plan cable routing for ten SATA III ports, one SATA Express interface and one M.2 interface.

Highlights

  • Supports up to 128GB DDR4 for heavy multitasking
  • Four-channel DDR4 at 2133 MHz with OC headroom to 3333 MHz
  • Intel X99 chipset on LGA 2011-v3 socket for Core i7 CPUs
  • Five PCIe 3.0 x16 slots enabling four-way GPU configurations
  • Realtek ALC1150 delivers 7.1 channel audio with S/PDIF output

Specifications

BrandMSI
SeriesMSI X99S GAMING 9 AC
ModelMSI X99S GAMING 9 AC
CPU Socket TypeLGA 2011-v3
CPU TypeIntel Core ™ i7 processors with new LGA 2011-3 slots
ChipsetIntel X99
Memory StandardSupports four-channel DDR4 2133/2200 (OC)/2400 (OC)/2600 (OC)/2666 (OC)/2750 (OC)/3000 (OC)/3110 (OC)/3333 (OC) MHz memory
Maximum Memory Supported128GB
PCI Slots5 PCIe 3.0 x16 slots, supporting 4-way mode
- 1-way mode: x16/x0/x0/x0/x0
- 2-way mode: x16/x0/x0/x16/x0 *, 16/x0/x0/x8/x0 **
- 3-way mode: x16/x0/x0/x16/x8 *, x8/x8/x0/x8/x0 **
4-Way mode: x8/x8/x0/x16/x8 *, x8/x8/x0/x8/x4 **
* Limited to CPUs that support 40 PCIe channel specifications.
Limited to CPUs that support 28 PCIe channel specifications.
SATA RAID1XM.2 interface, 1xSATA Express interface, 10xSATA III interface
Audio ChipsetRealtek ALC1150 decoding chip
- 7.1 channel high-quality sound effects
- Supports S/PDIF output
LAN Chipset1 Killer E2205 Gigabit network interface card
Onboard USBIntel X99 Express Chipset
- 6 USB 3.0 ports (2 on the back panel, 4 supported through built-in USB 3.0 connectors *)
- 6 USB 2.0 ports (2 on the back panel, 4 supported through built-in USB 2.0 connectors)
AsMedia ASM1142
- 2 USB 3.1 ports located on the back panel
VIA VL805
- 4 USB 3.0 ports located on the back panel
Built-in JUSB3 interface supports MSI Super Charger.

Questions about this item

How do I install the CPU into the LGA 2011-v3 socket and what step do people often get wrong?

Lift the socket lever, align the processor notches with the socket keys, place the chip gently without pressure, then lower the lever fully; the common mistake is forcing the CPU before the lever is completely closed.

What maintenance or replacement will the onboard Realtek ALC1150 audio and Killer E2205 LAN need later?

No scheduled maintenance is required for either controller; if audio or network functions fail after years of use, the motherboard itself would need replacement.

What limit appears first under sustained use with four-channel DDR4 memory running at 3333 MHz OC?

The memory controller on the installed processor typically reaches its thermal or voltage ceiling before the board's 128 GB capacity or the X99 chipset becomes a bottleneck.

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