Audio Performance

We limited audio testing to the Rightmark 3D Sound version 2.2 CPU utilization test and tested with sound enabled to show the performance effects on several games. The Rightmark 3D Sound benchmark measures the overhead or CPU utilization required by a codec or hardware audio chip.

The Realtek ALC-655 AC97 audio codec was tested with the recently released 3.84 driver set. The Realtek DirectSound audio drivers do not support more than 26 hardware buffers and the OpenAL 1.1 drivers do not support more than 23 hardware buffers at this time, so the scores cannot be directly compared to the HDA Mystique 7.1, Realtek ALC-882, and Creative Labs Sound Blaster X-FI audio solutions in the benchmarks. The Realtek OpenAL 1.1 driver increases CPU utilization up to 8% more than the Realtek DirectSound drivers.

Audio Performance - Empty CPU - 32 Buffers

Audio Performance - 2d Audio - 32 Buffers

Audio Performance - DirectSound 3D HW - 32 Buffers

Audio Performance - DirectSound 3D EAX2 - 32 Buffers

The Realtek ALC-655 AC97 audio codec has average CPU utilization rates with reductions of up to 4% in the 3D tests compared to the previous driver release. The HDA Mystique 7.1 Gold has the highest overall utilization rates of the audio solutions tested. The Realtek ALC-655 performance is good, but it does not match the audio quality of the ALC-882 HD audio codec. The Sound Blaster X-FI has the lowest overall rates as expected. Let's find out how these results translate into real world numbers.

Game Audio Performance - Serious Sam II - Branchester Demo

Game Audio Performance - BattleField 2

Game Audio Performance - Splinter Cell Chaos Theory

Game Audio Performance - Call of Duty II - Demo 5

Game Audio Performance - F.E.A.R. - Performance Test

The audio performance numbers remain consistent as the Realtek ALC-655 generally finishes near the HDA Mystique 7.1 and SoundBlaster X-FI. Serious Sam II suffers a loss of 43%, Splinter Cell at 1%, Battlefield 2 at 21%, Call of Duty 2 at 2%, and F.E.A.R. at 4%. The output quality of audio with the Realtek ALC-655 is good and continues to improve with each driver release, but in no way compares to the HD audio codecs or most discreet audio solutions. The majority of home/office users should have no issues utilizing the ALC-655, but we would not recommend it as the primary audio solution for a gaming or HTPC system, considering the overall quality of audio. In fact, the audio quality in most applications sounded flat and lacked clarity.

If you are a serious gamer, then a dedicated sound card is still a requirement to ensure consistent frame rate averages across a wide variety of games. We noticed in previous testing of our Battlefield 2 and Half Life 2 benchmarks that the Realtek AC97 audio codecs would cause stuttering in intensive scenes. The 3.84 driver release does not have stuttering in our current benchmarks while improving performance across the board.

The Realtek 3.84 driver installation installs a basic control panel that features a built-in 10-band equalizer along with the standard mixer and speaker controls. We found the control panel to be user friendly and a definite improvement over the standard Windows audio properties application.

Ethernet Performance Final Words
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  • Marlin1975 - Wednesday, March 15, 2006 - link

    Again with the cheap sound and fan heatsink. When I see Realtek sound i think jubk. But then ui see a NON-HD ALC-655 I think even less of the board. I mean what did they save a whole quarter by going to the cheap non-hd sound? Let alone the pOS that is realtek.

    Then instead of juts putting a large passive heatsink they put a small one with a fan. Fans will wear out and even when working 100% still make noise.


    Good chipset but another example of the bean counters killing decent sound, PCIe ethernet, good heatsink, etc...
  • jimveta - Wednesday, March 15, 2006 - link

    One quibble: the onboard Nforce4 ethernet controller is NOT a PCIe device. None of the onboard devices are in fact.
  • kb3edk - Wednesday, March 15, 2006 - link

    I was thinking about building my first SLI rig off the ASRock 939SLI32 board reviewed here a few days ago but I'm glad I held off... it seems like the EPoX is a better overclocker. I already own two ASRock 939Duals with M1695, they overclock pretty decent but are held back by the vcore... I even tried one of the volt mods and it didn't work out for me. And yes, the BIOS on the M1695 board is the wackiest I have ever used, there's all sorts of hardware it still won't recognize. I think this is the most I've ever flashed a BIOS on any mobo I've owned. But I think things are under control now... ;)

    Why does the EPoX M1967 board beat the ASRock M1697 board in most of the gaming benchmarks despite the fact that the EPoX's PCI Express lanes are only x8 in SLI? According to the review of the ASRock board here that board is supposed to be running x16 in both lanes in SLI mode. Is it just that there are no PCIe cards out there yet that are maxing out PCIe x8 bandwidth?

    Anyway as long as my gaming isn't going to be held back by x8 PCIe (and it sure loks that way now) I think this EPoX board is a winner... thanks AnandTech for the great benchies!

    -Adam in Philly
  • Araemo - Wednesday, March 15, 2006 - link

    How long do you run prime95/superpi on an overclock to verify stability?

    I ask because I've just RMAd a board and CPU that could not run prime95 for more than about 5 hours at stock speeds, but it does run for about 5-6 hours before it shows an error. The replacement board and CPU have not arrived yet, so I haven't been able to check on a similar system yet.
  • Gary Key - Wednesday, March 15, 2006 - link

    quote:

    How long do you run prime95/superpi on an overclock to verify stability?


    We typically run the following or a combination thereof for both stock and overclocked conditions. We might utilize additional components or various combinations not listed in our test system and use such applications as Office2003, Nero, or Photoshop depending upon the situation.

    A. Prime95- Priority 1 - 30 minutes (if it passes go to step B, if not, tune until it can pass, this includes memory/voltage/fsb settings)
    B. Prime95- Priority 10 - 4~12 hours (depends on the board and target market)

    1. SuperPI - 3 iterations with settings at 32m generally, sometimes less.

    2. 3DMark01 - Demo Loop 2 hours

    3. 3DMark05 - Demo Loop 2 hours

    4. Prime95/3DMark05 - Prime set at priority 1 - 3DM05 Loop - 4 hours

    5. WorldBench 5 - 3 iterations (optional, depends on board, target market, or new chipset)

    6. Standard test suite - 3 iterations of each application.

    7. Game Testing - 4~8 hours of actual gameplay, AOE III, BF2, GTR/Legends, Guild Wars or others depending upon the software image.

    8. MemTest86 - 2~6 hours (depends on board, target market, or new chipset)

    Please realize that a combination of components, drivers, bios settings, and software loads can all account for failures that are outside of the true capability of the board. Our test systems generally use premium components that assist in the ability of the board to pass these tests along with constant climate control settings. The amount of hours required to debug a system is sometimes staggering. Of course we cannot test every combination of components or software available so at times a certain combination that fails for a user is not seen by us. I hope this answers your question.
  • Araemo - Wednesday, March 15, 2006 - link

    Thats slightly better than I expected, but I have one last question: During the extended prime95 test, are other things done on it in the meantime(the 3dmark runs or gaming or some such?).

    In personal use I like to see at least 24 hours of prime95, but I FULLY understand that that would be even more time consuming for you guys, since you have to verify stability at multiple settings per board per review... 12 hours is welcome to me.
  • Araemo - Wednesday, March 15, 2006 - link

    Nevermind, I saw you answered my own question in #4(thats what i get for skimming the list)
  • kb3edk - Wednesday, March 15, 2006 - link

    I like to run prime95 or other burn-in programs (like Sandra, etc) overnight just to be on the safe side, but in my experience if I am pushing an OC too hard I have always had burn-in fail within half an hour. Of course from reading countless other postings on OC message boards, YMMV :)

    To keep things topical here, my ASRock M1695 boards can bump an A64 Winnie 3000+ from 1.8 to 2.25 GHZ (250 HTT), and an A64 X2 Manchester 3800+ from 2 GHz to 2.4 GHz (240 HTT). After that the boards just run out of volts. If I try to push the HTT any higher the system doesn't even boot.

    Did you make sure to check your RAM before RMAing that mobo and CPU? Sometimes if you have a bad register somewhere, a burn-in program will take a little time to reach it and conk out. Especially something like superpi which has such a low memory footprint. You might wanna run Memtest86 on your box as soon as you get a chance, if you haven't already.
  • Araemo - Wednesday, March 15, 2006 - link

    My RAM passed memtest86+ on both this motherboard, and my old NF7-S(Once I found out one ram slot on that board was bad and moved the second stick to the other slot, I left it running memtest86 all day and it never errored. But I wanted dual channel memory again, so I ordered the ASRock 939DualSata2 and a 3200+, and memtest86 passes, but prime95 dies eventually.)

    Technically, registers are in the CPU, and I think ram uses a different terminology, but I know what you meant. As far as I can tell, my RAM is fine, and I don't believe it is a windows problem(I've only had one crash in the week I've had the board: Winamp crashed on me randomly last night.. UT2k4 and NS/TS(Half-life mods) run fine)

    My PSU should be plenty for this board(According to people in the ASRock thread in the forums, my PSU is higher end than others who have this system running well, and voltages are stable according to the mobo)... Sooo... I have no way of knowing if it was the board or the CPU, since I don't have any other S939 boards around. I'm just glad newegg let me return it with no hassle. (And I was smart enough to order the opteron 146 this time around instead of the 3200+.. but I never even got around to touching the overclocking on the 3200+. I don't start overclocking until I know prime95 is stable at stock settings)

    On my mobile barton I experienced similar symptoms of a too-high overclock: Prime95 would error out relatively quickly, sound would start screwing up(I went the quick way, I'd load prime95, and the 3dmark03 demo.. nice heavy stress and audio(and sometimes video) would start going weird well before a hard lock.) And that CPU and ram still handle memtest86 and prime95 fine.
  • Araemo - Wednesday, March 15, 2006 - link

    I'm also curious how you know a system is 'super pi' stable?

    As far as I can tell, it's more a speed test than a stability test in the sense that prime95 is..

    Super Pi seems to be calculating a fresh value for pi, but not comparing it to the known value? Is there an easy way to compare its output to the known value?

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