Additional Info

NVIDIA nForce4 SLI/SLI X16 Technical Specifications



SLI Support

  • NVIDIA nForce4 SLI X16:
    • Two full-bandwidth, 16-lane (x16) PCI Express links
  • NVIDIA nForce4 SLI:
    • Two x8 PCI Express links

Frontside Bus: Pentium 4 CPU Interface (Intel only)

  • 2x address and 4x data
    • QDR (Quad Data Rate) support for 400 MT/sec.–1066 MT/sec. (100 MHz–266 MHz FSB)
    • Theoretical maximum burst bandwidth of 8.5 GBps
  • Standard bus speeds up to 266 MHz supported
  • 36-bit addressing for access to 64 GB of memory space
  • Dynamic Bus Inversion
  • Frontside bus (FSB) pipeline depth of 12 in-order queue depth
  • Hyper-Threading Technology support

HyperTransport technology: Athlon 64 CPU Interface (AMD only)

  • 16 x 16 link running at 1 GHz for extremely high throughput (8.0 GBps)
  • Differential lines with low voltage swings

Dual Channel DDR2 128-Bit Memory Interface (Intel only)

  • Two independent 64-bit memory controllers
  • Can also operate in ganged mode (as one 128-bit controller)
  • Support for 400 MT/sec. (200 MHz), 533 MT/sec. (266MHz), and 667 MT/sec. (333 MHz) for a theoretical maximum bandwidth of 10.6 GBps
  • Up to eight internal banks per DDR2 chip
  • Up to two DIMMs per controller for a maximum of four DIMM support
    • Separate 64-bit data bus per controller
    • Separate address and control bus per DIMM
    • Up to 16 GB using four 4 GB DIMMs
  • Supports synchronous and pseudo-synchronous operation with FSB
  • Supports un-buffered non-ECC DIMMs
  • Low power suspend-to-RAM (S3) support
  • Active and precharge power down
  • Support for SPD (Serial Presence Detect) scheme for DIMM detection and configuration

Power Management

  • Internal clock generator
  • Support for Pentium 4 performance states (Intel only)
  • Support for HyperTransport link lower power disconnected state
  • PCI Express L0s and L1 active link power management support and L2/L3 low power state support
  • Full ACPI 2.0 and PCI PM 1.1 support, including C2/C3, Power on Suspend, Suspend-to-RAM, Suspend-to-Disk, and Soft-Off CPU power state support.


Native Gigabit Ethernet technology
  • The fastest Gigabit Ethernet solution in the market
  • Supports 1000/100/10Base-T Ethernet
    • RGMII or MII interface
Advanced networking features
  • TCP segmentation offloads
  • Jumbo frames
  • Checksum offloads
  • Interrupt moderation
  • Traffic prioritization
  • Remote wake-up
  • Network management for easy set up, configuration, and monitoring
TCP/IP Acceleration
  • Dedicated hardware engine
  • Reduces CPU overhead


NVIDIA MediaShield™ Storage
  • RAID 5 faster disk access with fault tolerance and optimized capacity
  • RAID 0 disk striping support for highest system and application performance
  • RAID 1 disk mirroring support for fault tolerance
  • RAID 0 +1 disk striping and mirroring support for highest performance with fault tolerance
  • NVIDIA Disk Alert System provides a visual indication so users know exactly which SATA hard drive to replace during an array failure
  • Converting allows users to change the current state of an array to another using one single step without reboot of the PC
  • Cross Controller RAID uniquely supports both SATA and PATA disk devices within a single array

Serial ATA
  • Support for SATA 3Gb/s and SATA 1.5Gb/s disk controller standards
  • Supports full Tagged Command Queuing (TCQ) and Native Command Queuing (NCQ)
Dual controller architecture
  • Two separate and independent controllers. Results in up to twice the bandwidth to disks
  • Four (4) integrated SATA 3Gb/s ports
Fast Ultra ATA-133 Disk Drive Controller
  • 5V-tolerant primary and secondary channels, with support for up to four devices
  • Supports Ultra-DMA modes 6-0, DMA modes 2-0, and PIO modes 4-0
  • Industry-standard PCI bus master IDE register set
  • Separate independent IDE connections for 5V-tolerant primary and secondary interfaces


PCI Express Interface – NVIDIA SLI
  • PCI Express high-performance, scalable interconnect. Rapidly being adopted by the PC industry; designed to replace the AGP and PCI interconnects currently in use.
  • A x16 PCI Express link has 4 times the total bandwidth of today’s AGP 8X interface
  • x16 PCI Express link for high-performance graphics cards featuring the latest graphics processing units (GPUs) with DirectX 9.0 and Shader Model 3.0 support
  • Additional x1 PCI Express links for other add-in cards
  • NVIDIA nForce4 SLI X16:
    • Nine independent PCI Express controllers with 40 total lanes support popular configurations such as (for Intel):
      • Two x16, one x2 and six x1 PCI Express links
    • Seven independent PCI Express controllers with 38 total lanes support popular configurations such as (for AMD):
      • Two x16, four x1, and one x2 PCI Express links
  • NVIDIA nForce4 SLI:
    • Five independent PCI Express controllers with 20 total lanes that can be configured as follows:
      • One x16 and four x1 PCI Express lanes ·
      • Two x8 and three x1 PCI Express lanes (SLI Mode)
  • x16 controller can support isochronous data channel
  • Supports PME messages for power management
  • 2.5 GHz support for a theoretical maximum bandwidth of 2.5 Gbps per lane per direction

USB 2.0

  • USB 2.0 Enhanced Host Controller Interface (EHCI) / USB 1.1 Open Host Controller Interface (OHCI)
  • Support for up to 10 ports
  • Supports transfer rates at high speed (480 Mbps), full speed (12 Mbps), and low speed (1.2 Mbps)
  • Dynamically configures slower devices for best utilization of bandwidth
  • Allows USB concurrency
PCI Interface
  • Includes an arbiter that supports six external master PCI slots.
  • Features of the PCI interface include:
    • PCI 2.3-compliant, 5 V tolerant
    • Supports six external PCI slots at 33MHz
    • Supports five bus master arbitration
    • PCI master and slave interfaces
    • Supports both master-initiated and slave-initiated terminations
    • Bidirectional write posting support for concurrency
    • Flexible routing of all four PCI interrupts
    • Supports read ahead: memory read line (MRL) and memory read multiple (MRM)


AC ’97 2.3 compliant interface
  • Supports 2, 4, 6, or 8-channel audio
  • Dual AC-Link – supports up to two codecs
  • Dual S/PDIF – supports two simultaneous digital outputs; handles stereo PCM or AC-3 output
  • 16-bit or 20-bit stereo, 48 kHz output and 16-bit input streams across AC-Link
  • 24-bit, 96 kHz stereo output on the secondary S/PDIF output
  • Supports input, output, and general purpose input/output channels for host-based modems
  • Separate independent functions for audio and modem