Graphics cards in new iMacs

Discussion in 'Buying Tips and Advice' started by interairproxima, Aug 8, 2007.

  1. interairproxima macrumors newbie

    Jul 10, 2007
    I thought I heard somewhere that somehow the Radeon HD 2400 XT in the base iMac with 128 MB of VRAM was better than the Radeon 2600 Pro with 256 MB VRAM in the others...
    Is this true in any way?
  2. clevin macrumors G3


    Aug 6, 2006
    no, even with same amount of VRAM, 2400XT is ~30% slower than 2600 pro (of course, in 3D intense work, they are both more than good enough for everyday use)

    from wiki
  3. JimMc1984 macrumors newbie

    Aug 8, 2007
    Does anyone know if the 2400 is better or worse than the 1600 found in previous iMacs? I cannot find any benchmarks to compare the two. Common sense would suggest that the 2400 is better, but then again, common sense is not always right.

    I assume (hopefully correctly) that the 2600 is unquestionably superior to the 1600.
  4. clevin macrumors G3


    Aug 6, 2006
    different generation of graphic cards are hard to compare, not only they are different in clock, tech, etc, newer cards also support newer standard (such as HD2x00 supports DX 10.0). so generally, newer generation of cards should be more future-proof.

    but purely speaking of speed, 2600 better than 1600 (in most cases), and 2400 is not as good as 1600.

    only number i can find is here:
    My final guess is new entry level iMac's HD 2400XT has more features than previous iMac with X1600, but slightly slower (~10%).

    Let me know if you can find more comparison and benchmarks.
  5. clevin macrumors G3


    Aug 6, 2006
  6. chewietobbacca macrumors 6502

    Jun 18, 2007
    Don't use the 2400 if you want to game. The 2400 was almost entirely designed for HTPC's with their passive heat dissipation and UVD capabilities but no gaming ones.

    In fact, I really wouldnt' even recommend the 2600 if you want to game heavily. Light gaming should be okay, and ATI is actually good about drivers *cough*nvidia*cough* so hopefully apple follows suit.
  7. Queso macrumors G4

    Mar 4, 2006
    There's two things I'm wanting to know. Firstly, it appears that all the games so far used to benchmark these cards are based on DirectX, not OpenGL, at least from the ones I can find. If anyone knows of any OpenGL benchmarks can you please post a link?

    Secondly, the benchmarks posted show the DDR2 version of the 2600 Pro, which had a 600MHz bus speed. Does the DDR3 version of the card being used by Apple have the same 800MHz bus speed as the 2600XT, and if so can we expect it to be significantly faster than the DDR2 version?

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