New Feature: LinkBoost

One of the feature sets unique to the nForce 590 SLI MCP - and highly touted by NVIDIA - is called LinkBoost. If a GeForce 7900 GTX is detected on the nForce5 system then LinkBoost will automatically increase the PCI Express (PCIe) and MCP HyperTransport (HT) bus speeds by 25%. This increases the bandwidth available to each PCIe and HT bus link from 8GB/s to 10GB/s. Since this technology increases the clock speed of the PCI Express bus by 25%, NVIDIA requires certification of the video card for this program to work automatically. In this case, the 7900GTX is the only compatible card currently, although you can manually set the bus speeds and achieve the same or better overclock depending upon your components.

In essence, NVIDIA is guaranteeing their chipset's PCIe and HT interconnect links are qualified to perform up to 125% of their default speeds without issue. While LinkBoost is an interesting idea, its actual implementation did not change our test scores outside the normal margin of error. The 25% increase in PCIe and HT yielded virtually the same performance as our system without LinkBoost enabled. The reason is that the performance boost is being applied in areas that have minimal impact on system performance.

LinkBoost is part of a package of easy-to-use auto overclocking features on the nForce5 designed for the OC newbie. If you fit in that category and you are excited about the 25% LinkBoost speed increase, you need to clearly understand that the 25% LinkBoost increase yielded little to no real performance increase. The true performance potential of this technology would have been realized on the AM2 CPU if the MCP's link to the CPU/Memory subsystem would have been dynamically increased from the base 8GB/s level, but NVIDIA does not control AMD CPU certification and thus left the CPU at stock speed.

The end result is that the Northbridge to CPU HyperTransport link remains at 8GB/s, and only the link between the MCP and SPP as well as the PEG slots get increased bandwidth. Having 8GB/s of bandwidth feed 10GB/s basically means you are still effectively limited to 8GB/s. It is possible that increasing the Northbridge to CPU bandwidth could improve performance slightly, but HyperTransport performance is rarely the bottleneck in current systems as you will see in our performance results.

New Feature: FirstPacket

As part of the overhaul of the networking features found in the NVIDIA nForce 500 Series, FirstPacket is a packet prioritization technology that allows latency-sensitive applications and games to effectively share the upstream bandwidth of their broadband connection. Essentially this technology allows the user to set network data packets for applications and games that are more latency sensitive with a higher queue priority for outbound traffic only.

FirstPacket is embedded in the hardware and offers driver support that is specifically designed to reduce latency for networked games and other latency-sensitive traffic like Voice over IP (VoIP). When network traffic constrains a connection, latency is increased which in turn can result in dropped packets that would create a jitter and delay in VoIP connections or higher ping rates to the game server resulting in stutters and decreased game play abilities.

In the typical PC configuration, the operation system, network hardware, and driver software are unaware of latency issues and therefore are unable to reduce it. The standard interfaces that allow applications to send and receive data are basically identical to the OS in a typical system. This design results in latency-tolerant and large packet applications like FTP or Web browsers filling the outbound pipeline without regards to the needs of small packet and very latency-sensitive applications like games or VoIP applications.

FirstPacket operates by creating an additional transmit queue in the network driver. This queue is designed to provide expedited packet transmission for applications the user determines are latency-sensitive. The ability of the designated applications to get preferential access to the upstream bandwidth usually results in improved performance and lower ping rates. The FirstPacket setup and configuration is available through a new Windows based driver control panel that is very simple to use.

In our LAN testing, we witnessed ping rate performance improvements of 27% to 43% during the streaming of video from our media server while playing Serious Sam II across three machines attached to the network. We noticed ping rate performance improvements of 15% to 23% while uploading files via BitTorrent and playing Battlefield 2 on varying servers with VoIP conversations on Skype during game play. The drawback at this time is that only outbound packets are prioritized, so if you spend more time downloading than uploading the FirstPacket technology will have little impact for you. However, in NVIDIA's defense they cannot control the behavior or quality of service on other networked clients, so FirstPacket addresses the services NVIDIA can control - namely uploading.

Basic Platform Features DualNet, Teaming, and TCP/IP Acceleration


View All Comments

  • artifex - Wednesday, May 24, 2006 - link


    they (NVIDIA) really took the networking side seriously on this release although most of the features are designed for the server/workstation market

    If they want the TCP/IP acceleration to be a draw for that crowd, they'd better fix this thing with firewalls not being supported. I could not imagine running a corporate server like that. And it's a bit much for them to hold out Vista as a possible fix, as many of us would like to wait a while before dropping Vista into production environments. Like a couple years. :)
  • Jaylllo - Wednesday, May 24, 2006 - link

    Is it just me, or do ATI/NVIDIA/INTEL make up a boatload of stupid names for simple features?

  • afrost - Wednesday, May 24, 2006 - link

    So when do we get low power chipsets to go with our low power CPUs?

    Nvidia's mid to high end GPUs use less power than ATI GPUs....but it's the other way around for chipsets......????

    seems odd
  • Gary Key - Wednesday, May 24, 2006 - link


    So when do we get low power chipsets to go with our low power CPUs?

    Rumor has it, in the late fall. ;-)
  • FinFET - Wednesday, May 24, 2006 - link

    On this page"> the nForce 550's summary reads

    "Several of the higher and options have been dropped from the 550 chipset"

    I believe you meant
    "Several of the higher end options have been dropped from the 550 chipset"
  • Wesley Fink - Wednesday, May 24, 2006 - link

    Corrected. Reply
  • peternelson - Wednesday, May 24, 2006 - link

    How can you say there is not improvement?

    The 590SLI gives increased number of PCIE lanes to total 46.

    These are available as 16, 16, 8, and six individual 1x connections.

    Assuming some slots on the motherboard:

    x16 slot: card x16 nvidia graphics card
    x8 slot: card x8 MYRINET 10 GIGANET hardware accelerated LAN

    I'm not particularly interested in consumer level SATA and LAN but consider them a free bonus. What MATTERS is that there is enough BANDWIDTH to use some PROPER peripherals without bottlenecks.

  • Egglick - Wednesday, May 24, 2006 - link

    The only new "feature" I'm really interested in is the TCP/IP acceleration, which lowers CPU usage. The rest of it is a bunch of gimmicks and garbage as far as I'm concerned. I'd rather not use those "features" at all, as they're much more likely to cause problems than any sort of performance boost.

    When I think of that, coupled with their stupid SLI Memory program (another gimmick), my view of NVidia's chipsets is significantly lowered. When the time comes for me to upgrade, I'll be strongly considering ATI's chipset offerings instead.
  • bob661 - Thursday, May 25, 2006 - link

    Your name should be Buttlick with that comment. So, let me get this straight (or gay depending on which way you swing), these extra features that Nvidia is giving us are apparently no good since you say so. The rest of us might as well just shut off our computers, grab a pr0n mag, and spank it like it's 1999. Jesus, who needs a brain with you around.
  • Pirks - Wednesday, May 24, 2006 - link

    Yeah, right... ATI are completely smoke'n'mirrors free guys... cool! :) Reply

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