HD 4870 and 4850

By kunjikaly ยท 7 replies
Apr 25, 2008
  1. Hi I am using Gigabyte 780 g chipset, does these card support the HYBRID !crossfire - SLi on the 780G ?
  2. Didou

    Didou Bowtie extraordinair! Posts: 4,274

    Wait for them to be actually released before asking that. So far only the specs have been leaked so even them could be subject to change once the final products are released.
  3. kunjikaly

    kunjikaly TS Rookie Topic Starter

    Any benchmark

    Any benhmark leaked or released?

    Thanking you
  4. kunjikaly

    kunjikaly TS Rookie Topic Starter

  5. _FAKE_

    _FAKE_ TS Rookie Posts: 116

    Those are fake. There are no "proper" benchmarks that have been done using the HD4870 or HD4850. Though judging by the specs they will bound to be more powerful than the 9800GTX.

    But however, I've just seen the specs of the 9900GTX and it looks like it may be a monster performer. A single 9900GTX may even be more powerful than the 9800GX2. But also judging from the specs it seems like it may be very expensive to manufacture so the selling price is bound to be fairly high. I also believe they are using the 65nm process as well which I don't think was a good idea.

    If indeed the 9900GTX is expensive it may be out of my price range and I'll settle for a HD4870.
  6. kunjikaly

    kunjikaly TS Rookie Topic Starter

    Kindly forward the specification
  7. _FAKE_

    _FAKE_ TS Rookie Posts: 116

    Sure mate

    * ATI Radeon HD 4850 - 650MHz/850MHz/1140MHz core/shader/memory clock speeds, 20.8 GTexel/s (32 TMU x 0.65 GHz) fill-rate, available in 256MB/512MB of GDDR3 memory or 512MB of GDDR5 memory clocked at 1.73GHz
    * ATI Radeon HD 4870 - 850MHz/1050MHz/1940MHz core/shader/memory clock speeds, 27.2 GTexel/s (32 TMU x 0.85 GHz) fill-rate, available in 1GB GDDR5 version only
    * ATI Radeon HD 4870 X2 - unknown core/shader clock speeds, available with 2048MB of GDDR5 memory clocked at 1730MHz


    As for the GT200, the specs I believe are around:

    65nm fab process.
    478mm^ die size(as big as the original G80 GPU).
    192 unified shaders(roughly 1.5 Terraflops of floating point shading power,with the shaders running at 1625Mhz)
    DX10.1 support.
    512 bit memory bus(using GDDR 3 at 1180 Mhz for a total of 151 GB/sec of memory bandwith)
    32 ROP's(23.1 Gigapixels/sec)
    Texture fillrate at 69.2 Gigatexels.
    GPU clock is at 650 mhz.
    1GB ram.

    The GT200 will probably be as fast or faster than the HD4870X2 but will also cost about the same amount.

    But neither cards have come out nor have been benched so I can't say for sure. What I do know is that a trusted source has claimed that the GT200 (9900GTX) is capable of running Crysis at Very High settings with 4xAA at 1900x1200 at around 25-35fps which is playable in Crysis due to motion blur effects. I don't think even the 9800GX2 is capable of that.

    The same person predicted the performance of the G80 and got it spot on. But I will wait and see for myself.
  8. vijayninel

    vijayninel TS Rookie

    kk i thought you had not yet bought that 780 as you could not sell your mobo. when did you get 780???
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