Overclocking

In past reviews, we have discussed the importance of overclock test results - even if you never overclock. Everything about a board's quality comes together in these results, as it takes outstanding stability, great parts, and a good design to withstand the heat and stress of overclocking. This should matter to you even if you don't overclock, since it will tell you a great deal about a board's stability at stock speeds and the potential for a long board life.

Overclocking

Overclocking

We have seen a number of really good overclockers for Socket 939 in the past year, but we are tremendously impressed with the overclocking abilities of ATI's Reference board. 245 Clock Frequency at stock multiplier is the highest overclock that we have ever seen with this reference processor, matching the performance of the Sapphire PURE Innovation, which is based on the single GPU version of the same Radeon Xpress200 chipset. Reaching 245 when the best boards that we have tested did 238 and 240 is a strong indication of excellent voltage stability under stress in the ATI Crossfire AMD.

315 at lower multipliers is the second best performance we have ever achieved, exceeded only by the legendary DFI nForce4 SLI board. This places the ATI Crossfire AMD in the company of the few excellent overclocking Athlon 64 boards that have managed to reach a stable 50% or better frequency overclock at lower ratios.

ATI has made tremendous progress in board design since we looked at the initial Bullhead board last November. This Crossfire AMD seems the culmination of those efforts, with the best AMD chipset performance that we have ever tested. Earlier Grouper and Jaguar single-CPU boards have also likely benefited from AMD's continued improvement of Crossfire family boards. We hope ATI is also able to apply this design excellence to the ATI Crossfire Intel board.

General Performance and Encoding Disk Controller Performance
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  • n00b1e - Tuesday, September 27, 2005 - link

    Great article, but how about benchmarking real apps on the overclocked settings and comparing the result to the non-overclocked ones instead of just comparing the highest attainable memory/bus speed overclocks?
  • Quanticles - Tuesday, September 27, 2005 - link

    Another bought review...

    "The ATI Crossfire AMD has every option a serious overclocker could wish for."

    How about the option to use a CRT? I like to use 1600x1200 at 85 Hz.
  • Wesley Fink - Tuesday, September 27, 2005 - link

    A 7800GTX or X1800 can easily do 1600x1200 at 85 Hz - and probably outperform X850XT Crossfire. It's all a matter of perspective.

    In addition, Derek has already said the next gen (X1800), due out in less than 2 weeks, does not have this limitation in Crossfire mode. That's why he did not recommend Crossfire X850/X800 and said to wait a short while. THAT Crossfire solution will also work on this board.
  • ChronoReverse - Tuesday, September 27, 2005 - link

    Red Herring. We're talking about the motherboard and how wellit can overclock the cpu). The graphics card is irrelevant (and the limitation on the xfire cards themselves not the motherboard).
  • Myrandex - Tuesday, September 27, 2005 - link

    2nd page:
    The various ATI Radeon Xpress 200 north bridges can also be combined with ULi south bridges. The current ULi 1573 provides all the features of the ATI BS450 except integrated Gigabit Ethernet.

    should be SB450
  • Wesley Fink - Tuesday, September 27, 2005 - link

    I have spoken witrh ATI and several mfgs this morning to update board availability. Between today and the 2nd week of October we should see RETAIL Crossfire motherboards appear from DFI, Gigabyte, ECS, MSI, Asus and a few others. RETAIL availability means you will be able to buy them at New Egg or other e'tailers at that time.

    X850XT Master Cards are expected to be for sale RETAIL tomorrow, September 28th, with X800 Master Cards several weeks away.

    I have a Gigabyte Crossfire AMD in my hands as I write this. It is the release Vewrsion 1.0 board and I received the release BIOS this morning.
  • eastvillager - Tuesday, September 27, 2005 - link

    "yeah, we know our usb performance sucks on SB400, we're fixing it in SB450"

    "Yeah, we know our usb performance sucks on SB450, we're fixing it in SB600"

    prediction:

    "Yeah, we still don't have USB 2.0 working properly on SB600, wait till SB700, when USB 3.0 comes out and we'll be ok."

    Kind of hard to understand how they can do just about everything else on the mobo correctly, but continually screw up USB 2.0. USB 2.0 is a commodity at this point, it is just suppose to work, with no worries, etc.

    I use USB 2.0 on a daily basis, it really isn't an area I'm willing to slack on.
  • Leper Messiah - Tuesday, September 27, 2005 - link

    Hm. I'm getting a new mobo soon (as in the next 2 weeks). Is this a paper launch, or will we see single slot solutions out there soon? nVidia has set a precedent with the instant availiblity and massive volume (relatively, I mean they're selling below MSRP for a reason) of their 7800 series. It could be more damaging than delaying the R520 if they don't have it and this mobo out STAT.


    Would be kinda funny though...for years I've run nVidia chipsets and ATi graphics. Looks like it might get reversed...
  • allnighter - Tuesday, September 27, 2005 - link

    Agreed. Not that I'm referring to AT's conclusions being questionable in any way, shape or manner, I know they say what they see, but it's pretty much obvious that ever manufacturer/vendor simply handpicks any given piece of hardware that is sent to AT for review, since they all know that AT is pretty much the most trusted site. Although I appreciate early previews we get here, I'm a much bigger fan of reviews of retail products. That's about what you'll be able to buy, right away or in just a couple of weeks. Many of these reference pieces are on steroids and simply never materialize in real world performance.
    Other than that - a very good write up, as usuall.
  • TehSloth - Tuesday, September 27, 2005 - link

    Well mates, this sure does look nifty, but remember what happened to the RS480, which also received Anand's accolades as the best overclocking reference board ever, they couldn't release it right. The Gigabyte board that they talk about in the article was never actually released, and I have a long chain of correspondence with them as it got pushed back more and more. MSI, ECS, and Jetway were the only manufacturers that delivered, and they disabled all the OCing options. Psshhhah!

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