The upcoming launch of the Intel P55 and associated S1156 based processors is starting to resemble the buildup we noticed before the P965/Core 2 launch. We are already swamped with weekly press releases touting specifications and feature information from all of the P55 launch partners. In fact, revisions are occurring on an almost daily basis as each manufacturer tweaks their final product designs in hopes of capturing your hard earned dollars.

While aesthetics, features, and colors are an integral part of the motherboard design, ultimately how well it performs is based on the quality of components and BIOS design. We also happen to rate warranty and customer support at the top of this list but eventually it always comes back to performance or price for most users.

When it comes to performance, Gigabyte is usually a name that always comes up in the course of a conversation when discussing motherboards. They typically have extremely solid products and occasionally will hit one of those grand slam home runs with a product like the GA-EP45-UD3P, a board that offers the right blend of features, performance, support, price, and character.

The reason we bring this up is that the GA-P55-UD6 is already invoking the same feelings for us. Well, all except price as this will be Gigabyte's premium P55 offering. However, this board offers a lot for the money and is certainly targeting the enthusiast. Obviously, we cannot discuss performance yet, but the i5 is going to surprise a lot people, especially those buying into the lower end i7 market.

Even without the Gigabyte name plate on the P55 heatsink, taking one look at the layout and color scheme of this board instantly identifies its heritage. In fact, this design has not changed since we first looked at it during Computex this year. Gigabyte tossed the kitchen sink at this board and it stuck, but somehow it all works together without appearing to be too busy. We are not big fans of the floppy drive port and even IDE is starting to irritate us on the enthusiast boards, although one justification for IDE comes from the extreme overclocking community. In the quest to push PCIe speeds as far as possible the user can end up with some nasty SATA hard drive crashes that usually corrupt the operating system. So it turns out that an IDE drive can still be an overclockers best friend in certain situations.

Hello 24-phase VRM technology. As with the space race and horsepower wars a few decades ago, we are now officially witnessing a Phase race in the motherboard industry. Does a greater number of phases actually improve clocking or temperatures, not necessarily, in fact, it can do just the opposite if designed poorly. The good news is that Gigabyte appears at first glance to have done their homework in this area. Exactly what the true advantages of this design compared to the 8-phase or 12-phase setups utilized by other companies is something we are testing at this moment.

Gigabyte continues on with their Ultra Durable 3 technology that consists of high quality solid capacitors, low RDS(on) MOSFETs, and ferrite core chokes plus their custom "Dynamic Energy Savings" technology that will throttle this board down to four-phases at idle or low load situations.

Due to the real estate involved in placing a 24-phase VRM setup on the board, the majority of MOSFETs and Intersil phase doublers are located on the back of the board. Considering some of the MOSFET temperatures we regularly see when overclocking the X58 motherboards, this area does cause us some concern for users who test on an open bench since airflow and heat dissipation under the board will be severely blocked.

Otherwise, the area is open and easily accommodated our larger air coolers and water blocks. On a side note, this will be an eight layer PCB design.

A first for the P55 platform is the inclusion of six memory slots instead of the standard four slot designs we are seeing on the other boards. Unlike the i7/X58 platform that supports and thrives on triple-channel memory performance, the P55/Lynnfield employs a dual-channel setup. We think the inclusion of the two additional memory slots is strictly for expansion possibilities. Gigabyte claims DDR3-2000+ memory capabilities and we fully expect to see those speeds when the board launches.

The 24-pin ATX power connector is located in a convenient location as is the power on/off switch. We do have to wonder why the clear CMOS, reset, and power switches are located at different points on the board.

One of the more interesting areas on the board houses the various SATA ports (four 6Gb/s Marvell ports, six 3Gb/s P55 ports), LED debug display, clear CMOS and reset switches, and IDE drive port. Hiding underneath the heatsink is two Marvell 88SE9123 6Gb/s SATA chipsets that also provide IDE support. Contrary to reports on various forums and websites, it does appear the manufacturers are rethinking their recent decisions to drop the Marvell controller until the various hardware and driver problems are solved. It is too late in the process to qualify other controllers at this point for the majority of boards that were to include this chipset.

As such, it appears that Gigabyte (waiting on ASUS' official statement) is thinking they will leave the Marvell controller on the board and if 6G/s performance is not working properly, then the additional ports will be downgraded to 3Gb/s specifications. The "official" Marvell position is that the 88SE9123 controller suffers from PATA performance problems and that 6Gb/s SATA operation is not affected. However, after speaking with the motherboard suppliers and looking at our own test results, PATA performance/stability appears fine and 6Gb/s SATA performance is just not up to speed yet. Where the disconnect is between the motherboard engineers and Marvell is something we are trying to figure out at this point.

The P55-UD6 offers an abundance of expansion slots with an excellent layout. There are three PCIe x16 slots (x16/x4 or x8/x8/x4), two PCIe x1 slots, and two PCI slots. The Lynnfield processor series supports 16 PCIe 2.0 lanes and those lanes are assigned for graphics duty. The first x16 slot normally runs with 16 lanes and if you install a multi-GPU setup for CrossFire or SLI, then both slots run at x8. Truthfully, except for trying to set a benchmark record, the performance differences between dual x16 and dual x8 PCIe 2.0 is minimal at best in actual applications. The third x16 slot runs at x4 electrical and those lanes run off the P55 chipset.

Due to the performance hit of the DMI interface, NVIDIA has already informed the motherboard suppliers than they will not support SLI with this slot. We expect the same from AMD in regards to CrossFire X. We know of a few suppliers who have been toying with the NF200 bridge slot in order to run dual x16 or TriSLI on the P55 platform. So far, this concept has been problematic in the labs with performance and stability suffering to some degree at this stage in the game.

This I/O panel is loaded and ready for action. Gigabyte includes a combo PS/2 port, six USB 2.0 ports, two eSATA ports (JM362), two Gigabit Ethernet ports, IEEE 1394a port, optical and coaxial S/PDIF outputs, and the audio panel (Realtek ALC 889a). The Gigabit Ethernet controllers are courtesy of the Realtek RTL8111D chipset that features Smart Dual LAN technology. Simply put, if one controller fails, the board will automatically switch over to the other controller without the need to swap ports or run a second cable. Also, teaming is supported with a theoretical throughput of 2Gb/s, although actual throughput is far lower depending on your network setup.

That is it for now. Gigabyte is very interested in your thoughts on the design and feature list, so please feel free to leave comments.



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  • Hrel - Wednesday, July 29, 2009 - link

    When you guys do a motherboard review do you think you could start taking screenshots of the BIOS? I don't care if it's just with a camera... I REALLY want to see how the BIOS is laid out. I've worked mainly with Asus boards and always loved the BIOS, recently built with Gigabyte and that BIOS sucks, it's like one you'd buy from Dell. The board is solid, it's just one of those little things that I'm willing to pay 5 bucks extra for. Reply
  • yes - Monday, July 20, 2009 - link

    Along with checking how nice the RAM overclocks on this board, please also check that they indeed support the advertised maximum with popular brands of RAM. Wish you guys impress on them the need to be more open on the maximum RAM supported and at what speed and voltage. Reply
  • mapesdhs - Monday, July 20, 2009 - link

    ytoledano1 writes:
    > ... All I need are those sweet 6 dimms. So why do I
    > have to pay so much for features I don't need?

    Sounds like you need a more pro kind of board. Plenty to choose from,
    just browse around. Down side is price of course, but some are not
    too bad. However, I doubt you'll ever find one that's completely
    devoid of all these extras nowadays.

    My own gripe is with the PCI slots. Please Gigabyte (and other
    makers) can't you just once include a proper PCIX/133 slot instead of
    boring PCI? These are supposed to be enthusiast boards afterall.
    Some of us do love messing around with SCSI RAID, FibreChannel, etc.
    Last system I built (AMD-based, as I was keeping my 6000+ CPU
    for the time being) I went with an ASUS M2N32 WS Pro which works
    really well.


  • Denithor - Monday, July 20, 2009 - link


    Truthfully, except for trying to set a benchmark record, the performance differences between dual x16 and dual x8 PCIe 2.0 is minimal at best in actual applications.

    Back this up with benchmarks, please. The only benchmark I've seen comparing x16/x16 to x8/x8 is from the X48/P45 days and there was actually a pretty significant difference.

    I know Nehalem provides better "flow" of data to the GPU(s) but I'm curious about whether or not this will overcome the reduced bandwidth available on the P55 boards.
  • moggz - Monday, July 20, 2009 - link

    PLEASE GIGABYTE, I am on eof the many people who have a huge cooler on the gpu and a lot of space far down on the motherboard. I for one thinks that this is a huge wasteof slots and the ONLY CRITERIA that I look for in a motherboard is how far down the 16x pci-e slot is placed. This is never covered in reviews and very hard to find out so I usually have to guess as you motherboard manufacturers never write it out. I have desperately tried to make manufacturers understand this in the support but they JUST WON'T UNDERSTAND, so I am going to spell it out for you AGAIN in the hopes that some qualified person reads this:


  • blyndy - Sunday, July 19, 2009 - link

    features such as "Dynamic Energy Savings" are fine as long as:

    a) I can disable them
    b) They don't require anything to be installed in the OS!

    Please include these details in your reviews.

    Secondly, are those eSATA ports powered?
  • RagingDragon - Sunday, July 19, 2009 - link

    I'm not a fan of the heatsinks (nor those on the ASUS P55 board), while aesthically pleasing, they don't look terribly effective at cooling components:

    * Low surface area
    * Decorative covers block airflow

    I'd like to see heatsinks with simple fins - or better yet spikes/pins which can take advantage of airflow in any direction (fins would have more surface area than spikes/pins; however, fins require airflow from a specific direction, and thus would be more sensitive to how air moves within the case).
  • RagingDragon - Sunday, July 19, 2009 - link

    295Well if you want Gigabyte to drop IDE, floppy and PS2 ports, why not drop the old PCI slots too? The legacy support is all about not alienating potential customers:

    * Some customers want to keep a using a perfectly good PS2 keyboard (i.e. don't want to waste time/money replacing it or buying converters).
    * Extreme overclockers have had issues with USB keyboards, and that community is a significant source of hype for motherboard makers.
    * While gigabyte motherboards can load BIOS upgrades from a USB drive, some customers have graphics card, hard drives, etc. which require a floppy for firmware updates.
    * Some customers have some old PCI cards they want to continue using.

    So how about offering 2 motherboard variants, one with legacy support and one without?

    Personally, I don't care one way or the other about PS2, floppy, and IDE support. I would prefere to get rid of the PCI slots to make room for more PCIe slots - though with the addon SATA and network chips using PCIe lanes, maybe there aren't any more PCIe lanes available? If I have a single graphics card, can the PCIe x8 slot also be used as a PCIe x1 (i.e. can use the sockets in x16 + x1 mode rather than x8 + x8)? I like the PCIe x4 slot as it is useful for RAID controllers, but on the otherhand, the lanes could be split up to support more PCIe 1x connections.
  • troscat - Sunday, July 19, 2009 - link

    Is Intel's vDimm limit of 1.65V still applies for Lynnfield?

  • coachingjoy - Sunday, July 19, 2009 - link

    meh, I still fail to see the need or beauty of redundant network connections. Not a deal breaker but a waste of space and resources. Reply

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