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

  • ayqazi - Wednesday, July 5, 2006 - link

    I'm a little tired of hearing about so-called "chipset" hardware RAID. The writer of this article constantly made it seem that it was the chipset that was responsible for performing RAID operations on the disks, whereas nothing could be farther from the truth.

    Yes, the chipset may offload some of the work, but (in the case of RAID 5) the major calculations, like the XOR calculations, are done by the host processor.

    According to [L][/L] and [L][/L], Linux-based software raid is much faster than so-called fakeraid, since it has been optimised and developed more than the software drivers of the fakeraid chipsets.

    Anyway, just pointing out something that gets on my nerves a bit.
  • raildogg - Saturday, May 27, 2006 - link

    I think for most of us who have a nForce 4 ultras and SLIs, it doesn't make sense to upgrade to AM2 motherboards and processors. We'll need new memory too. No performance increase. Just upgrade to a X2 and that should be a good upgrade for those of us who don't have it yet. Reply
  • Powered by AMD - Friday, May 26, 2006 - link

    When in the article says:
    "In fact, the less than stellar write performance of the nForce4 in RAID 5 continues in the "new" chipset"
    It does mean that the write performance is good or not?

  • Zoomer - Saturday, May 27, 2006 - link

    Means just as bad as before, in a nicer manner. :) Reply
  • Gary Key - Saturday, May 27, 2006 - link


    Means just as bad as before, in a nicer manner. :)

    Thank you for the perfect reply. ;-) NVIDIA is working on this for the next refresh, their reasoning at this time is they did not want to introduce potential data corruption issues by improving the performance with the current chipset and driver base. It continues to reinforce our belief that although the nF590 SLI is the most feature laden chipset out at this time, the core continues to be nForce4 Plus in our eyes. This is not bad at all, just what can you do with a less than stellar CPU release (still an extremely strong CPU lineup) from a marketing viewpoint. I think NVIDIA and ATI are going to be hamstrung on sales with the AM2 release but hopefully they can make it up when Conroe (Core 2 Duo) launches shortly. :) The bios revisions we have received this week have improved performance but nothing that would make a nf4SLI/4800+ owner want to upgrade yet.
  • SonicIce - Wednesday, May 24, 2006 - link

    AM2 can just die. Reply
  • afrost - Thursday, May 25, 2006 - link

    i'm glad you took the time to type all that out..... Reply
  • KHysiek - Thursday, May 25, 2006 - link

    Well, but it does say precisely right about the whole AM2 transition.
    This is the most pointless hardware upgrade I've seen forfew last years.
    The only significant advantage of AM2 is a bit more featured mainboard. And you pay more for less speed. I think AMD is on the way down and no K8L can save them, cause it will be quad core only. What typical user needs quad core for price AMD keeps (like their pricing for current X2 CPU's versus Intel's).
    Core 2 is huge leap forward and combined with Intel manufacturing power will make big push back for AMD in coming months.
  • Pirks - Wednesday, May 24, 2006 - link

    Gary, what's about that QoS network driver/protocol hanging around in my WinXP for years? I heard it does some quality of service stuff/packet prioritizing/etc soo... is FirstPacket just an interface for this Microsoft QoS thing? Or is nVidia didn't know about it and reinvented the wheel? Reply
  • Gary Key - Wednesday, May 24, 2006 - link


    Gary, what's about that QoS network driver/protocol hanging around in my WinXP for years? I heard it does some quality of service stuff/packet prioritizing/etc soo... is FirstPacket just an interface for this Microsoft QoS thing? Or is nVidia didn't know about it and reinvented the wheel?

    I raised this question at the Editor's conference as it appeared to me they decided to take advantage of some hooks/protocols in XP. I have a meeting with the platform manager tomorrow and hopefully some discussions with the Network guru next week after his return from vacation. I am trying to get an answer before our roundup is published. I noticed some interesting inter-actions during our network testing, will say this, they (NVIDIA) really took the networking side seriously on this release although most of the features are designed for the server/workstation market, but we get them for free on the desktop. We expect further hardware/driver improvements in the next refresh. I am trying to compare the outbound FirstPacket numbers to a D-Link Gamer Lounge at this time along with how both prioritize packets on the outbound lanes. There are so many different tests and options in just the new networking features to run that is a bit overwhelming at this point and of course the new draft-N equipment showed up this week also. ;-)

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