AVIVO HD vs. Purevideo HD Part 3: Midrange and Low-end Card Performance

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  1. #1
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    AVIVO HD vs. Purevideo HD Part 3: Midrange and Low-end Card Performance


  2. #2
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    Alltid bittert å se slike artikler rett etter man har kjøpt noe annet

    Trøst deg med denne: GeForce 8800 GT innfrir - Hardware.no
    Lavere strømforbruk og tilsynelatende god ytelse. Prisen er ikke som 8500 kortet ditt, men jeg veit det frister litt allikevel, hehe

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    Sitat Opprinnelig postet av knutinh
    Takk for tipset. Akkurat den testen jeg ventet på. Så var det bare å finne ut hvilket 2600 XT kort en skal gå for. Noen som har tips? Kommer til å bygge om kortet til heat pipes kjøling.

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    Sitat Opprinnelig postet av Mozze
    Alltid bittert å se slike artikler rett etter man har kjøpt noe annet

    Trøst deg med denne: GeForce 8800 GT innfrir - Hardware.no
    Lavere strømforbruk og tilsynelatende god ytelse. Prisen er ikke som 8500 kortet ditt, men jeg veit det frister litt allikevel, hehe
    Men 8800GT har kanskje ikke full dekoding av h264, i likhet med andre 8800-modeller?

    Noen som vet om 8500GT har prosessering som 8600 eller 8400?

    Interessant å merke seg at Nvidia tydeligvis fungerer best i Vista, mens ATI gjør XP og Vista like bra.

    Interessant også å merke seg at både Nvidia og ATI sine low-end modeller hadde seriøse problemer. "Ny driver kommer snart". Noen som har hørt den før eller??

    During our testing, we were faced with what appeared to be pretty big teething issues with 1080p playback on both the 8400 GS and 2400 PRO cards.

    Let's start with the 2400 PRO. This is one hell of an issue, as all of the 1920x1080 content was played back at a maximum resolution of somewhere around 1440 pixels wide. This means that if your desktop resolution is set to more than 1440 pixels wide, the 2400 PRO would display HD content in a box with a black border around it. Yuck!

    We found a registry tweak hack on the 'net that would allow the 2400 to output video at the full 1920x1080 resolution (AVS Forum - Home Theater Computer), but it only seemed to work for us in Windows XP, and only if the 'pulldown detection' setting was disabled in the Catalyst drivers.

    When we asked ATI about the problem, they let us know that they had intentionally limited the output size on slower cards like the 2400 PRO, because they were worried that HD video would choke on them. However, they also promised us that the upcoming 7.11 Catalyst drivers would remove this limitation, and allow even the lowly 2400 PRO to display 1920x1080 video. So we'll be checking up on their promise in a future review.

    While the 8400 GS thankfully had no screen-size limitations or borders, we did experience a lot of 'flashing' during playback. That is to say, it seemed as though some frames were randomly flashing bright white. This was very distracting, to say the least, and I don't think we'd sit through a movie on the 8400 GS if we didn't have to. At the time of writing this, Nvidia hasn't gotten back to us about this problem, and we can only assume it's a driver glitch that they'll address in the future.

    So there you have it. Although we benchmarked both the 8400 GS and 2400 PRO in this review, take all of the results with a grain of salt as neither of these cards are viable 1920x1080 performers quite yet. At this time, the 2400 PRO is viable either on a 1440x900 or lower resolution, or in Windows XP with the registry tweak mentioned above and 'pulldown detection' disabled. The 8400 GS was not viable for viewing HD DVD content at all on our test system, and though we assume it's a driver glitch, it's possible that it was an incompatibility with our specific system somehow, so we'll definitely be revisiting this in the future.

    In the meantime, keep these issues in mind before you purchase.
    -k

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    Intermediate Mozze sin avatar
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    Sitat Opprinnelig postet av knutinh
    Interessant også å merke seg at både Nvidia og ATI sine low-end modeller hadde seriøse problemer. "Ny driver kommer snart". Noen som har hørt den før eller??
    For mange ganger.. og en slik uttalelse fører for min del til umiddelbar innkjøpsstopp!

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    Purevideo HD FAQ svarer på det meste..
    PureVideo HD FAQ

    Q. What is new in GeForce 8400, GeForce 8500 and GeForce 8600 GPU video processors?
    These GPUs feature a new video engine that includes a bitstream processor (BSP) and an improved programmable video processor (VP). The BSP offloads the 100% of the CABAC and H.264 decode process from the CPU allowing playback of "full spec" HD DVD and Blu-ray movies. The new VP also has more advanced video post-processing algorithms which improve video quality.

    Q. Do the GeForce 8800 series GPUs include the same video processing capabilities as the new GeForce 8400, GeForce 8500 and GeForce 8600 GPUs?
    No. The GeForce 8800 uses the previous generation of PureVideo HD. This is because the GeForce 8800 is usually paired with more powerful dual-core CPUs and our goal is to achieve balanced use of all the processing power in your machine. With the GeForce 8800, it makes sense to let these powerful CPU cores handle functions they do well. But with the lower-end GPUs, which are usually paired with less-powerful, single-core CPUs, it is better for the GPU to take on the entire video decoding and processing task and the new PureVideo HD engine has been enhanced with these chips in mind.


    Liste over såkalt "HD" qualified cards (for purevideo)
    http://www.nzone.com/object/nzone_pvhd_build.html

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