Prelude to a Review-

The AMD 780G chipset got us excited about integrated graphics platforms again after its release last March. You can imagine our surprise when AMD contacted us in April asking what we would like to see in the next IG chipset scheduled for release this year. Of course, we obliged AMD with our wish list that included everything from 8-channel LPCM audio over HDMI to HD 3650 or higher-level performance.

We also requested a new Southbridge with improved RAID performance along with RAID 5 capability. More importantly, we wanted a chipset that could run true CrossFire and bridge the gap between the budget IGP and enthusiast level markets.  In other words, we wanted a chipset that could serve the multimedia and small form factor audience in a uATX form factor or provide top-flight performance and features for the enthusiast in an ATX form factor.  You know, something like the NVIDIA 750a SLI product or Intel’s P45 only with an IG unit.

AMD listened intently and replied they had something that might just fit our requirements.  We were even more surprised to learn that it was arriving in late June under the 790GX moniker. Yes, we had to wait until early August but estimated release schedules in this industry have a tendency to be overly optimistic.  For those diehard AMD fans, the delay in the release of the 790GX has been frustrating. Mainly due to the fact that rumors swirling around the internet about the performance and capabilities of the 790GX have been a bit more optimistic than the release schedule.

Unfortunately, speaking of release schedules, we think later August would have been a better target after spending the last week testing our 790GX products. In fact, we ran across so many problems that our article today is a preview of the chipset capabilities. We will follow-up quickly (Editor- no more food or Guitar Hero until this is finished) with a full review of products from Gigabyte, ASUS, Biostar, and Foxconn.

The majority of our problems center on BIOS tuning and driver related maladies. After speaking extensively with the motherboard suppliers, we are certain the BIOS releases that arrived late last night or those coming today will address problems ranging from NB multipliers/HT Ref Clock change requests not accepted via BIOS or AOD to 8GB compatibility issues along with other minor performance hindrances like memory SPD settings not being read correctly when overclocking. PCI peripheral support with a couple of network and audio cards is also giving us trouble. Of course, BIOS tuning can take you only so far and the requirement for solid drivers is necessary.

The 8.521.1 driver set, aka Catalyst 8.8 beta, has significant performance optimizations for the 790GX plus full support for the new C1E power savings mode, PowerPlay, and deep sleep instructions for the SidePort memory, umm Performance cache. As is the case with beta drivers there are liable to be various features that might not work correctly. One important feature that failed to work properly for us was CrossFire operation with our HD 4850 or HD 4870 cards.

Other problems ranged from proper C1E implementations and S1/S3 resume issues to HDMI repeater/screen resolution setups with commercial BD playback software. AMD informed us late today that we should roll back to the 8.7 drivers for testing all items but C1E. Of course, this meant graphics, power management, and performance testing on our test platforms just got tossed out the window. It also meant a reduction in IG performance around 3%~5% and some quirky results with C1E and Cool-n-Quiet enabled.


On a side note, we still do not have the latest version of AOD working correctly with any of our 790GX and 9950BE combinations after a stellar appearance on the 790FX board we utilized in our SB750 preview. Actually, these problems are typical during the launch of a product. It just seemed that in our case the perfect storm brewed as it was nearly impossible to close out each benchmark session without running into a problem. We sailed through discreet graphic card testing with the beta drivers but were stymied with the inability to run CrossFire although Hybrid CrossFire worked fine.

Our power draw tests revealed three different sets of numbers, not an explainable difference due to a board’s components, but a 30W difference at idle with the same components and BIOS settings. RAID 5 testing resulted in several different sets of IOMeter results between the boards that we are still investigating. Problems even carried over to HDMI output through our receivers although it appears rolling back to the 8.7 drivers today cured those issues.

In our estimation, the BIOS and drivers needed some additional brewing time before the product release. While it may seem we are picking on AMD, this occurs with NVIDIA and Intel also. In fact, we could devote an entire page to our early experiences with G45. However, all this said, we did find the motherboards to be extremely stable in the normal course of testing with major applications that typical users will utilize. In addition, performance from the integrated graphics unit is simply superb considering AMD’s competition. We did not discover any show stopping problems that would prevent us from purchasing the product at this time. Just beware that a BIOS spin and updated driver release will be required to get the most out of the board’s additional features.

So let’s take a look at the chipset specifications of the 790GX chipset.

Heading up North...


View All Comments

  • Selbatrim - Wednesday, October 8, 2008 - link


    Why is it that no review sites are doing a proper review of the 790GX motherboards? Maybe in particular finding out about hybrid crossfire, the DFI LanParty JR 790GX-M2RS which has crossfire on an mATX board.

    I see people wanting reviews of this and the 4550 and 4350s. Why not include some crossfire on the 4550 and 4350? Think differently and let us have an interesting review that doesn't just include the same old stuff. Is 3 way crossfire with the onboard 3300 and 2 discrete cards even possible? Could be GREAT for a small low PSU box...

    But at LEAST follow up your preview with a full review! Some of us stupid AMD fanbois have had precious little good news in the CPU and chipset department and the 750 southbridge might just have something interesting to offer! I want testing!!! GIVE ME REVIEWS!!!

    *end rant*
  • MikeODanyurs - Wednesday, September 24, 2008 - link

    No kidding, it's almost 2 months now since the preliminary review and still waiting... Reply
  • computerfarmer - Tuesday, September 23, 2008 - link

    Gary Wrote, September 10, 2008
    An update, DFI decided to proceed forward with their uATX 790GX board. My retail kit arrived today and I will be testing it shortly. Also, based on your comments and others I will show a 4870x2 vs 4870 CF on this platform and compare it to 790FX. The roundup should be up late next week, G45 is up on Monday with 790GX/780G/GF8300/NF750a comparison results.


    This review is late.
  • computerfarmer - Tuesday, September 23, 2008 - link

    Perhaps we are waiting for Intel to see AMD.

    I(we) have been waiting since August 6th for this review.
  • MikeODanyurs - Thursday, September 18, 2008 - link

    I take it the finished article should be out tomorrow? Reply
  • computerfarmer - Wednesday, September 3, 2008 - link

    I have written to Gary about the upcoming article. Gary has said it is coming, perhaps by the 15th of September. From the email I received, it sounds like it is worth waiting for. This will include several motherboards with the same ChipSets, other comparisons may be there as well. This will include RAID5
    Updated BIOS and Drivers will be part of this article.
    Now we have time line.

    Thank you Gary
  • computerfarmer - Wednesday, September 3, 2008 - link

    It has been since August 6 since AnandTech first published an article on 790GX/SB750 from AMD. Certain remarks have been made about the products and the proof has been promised, but not delivered.

    This is the second time in a row this has been done to an AMD motherboard chipset.

    Trust is built on promises delivered. AnandTech is not delivering and is not saying why.

    It is now September 3rd
  • Yangorang - Saturday, August 30, 2008 - link

    Hey I have a friend that wants to build a super HTPC with the 790GX and RAID5 5 X 750GB hard drives. Troubles with 4+ drives in RAID5 were mentioned in the article. Were they serious issues at all? Please elaborate. Reply
  • MikeODanyurs - Saturday, August 23, 2008 - link

    Final review please???? Reply
  • mpjesse - Thursday, August 28, 2008 - link

    Going on 3 weeks now... nice. Reply

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