ATI Radeon 4800 to have 480 stream processors?

Posted on Friday, Apr 25 2008 @ 00:00 CEST by Thomas De Maesschalck
TG Daily claims they have the specifications of the AMD Radeon 4800-series cards. The site claims the Radeon 4800 (RV770) series will be made on a 55nm process by TSMC and will have 480 stream processors, 32 texture units, 16 ROPs, 256-bit memory bus and support for GDDR3/4/5 memory.
The Radeon 4850 will debut with a GPU clocked at 650 MHz, while the shader array will be clocked 850 MHz. The 4870 has an 850 MHz core and a 1050 MHz shader clock. The fill-rate is closely tied to the GPU clock: The 4850 sports a fill-rate of 20.8 GTexel/s (32 TMU x 0.65 GHz), while the 4870 achieves a 27.2 GTexel/s (32 TMU x 0.85 GHz) performance.

The RV770 GPU is equipped with a 256-bit memory controller (512-bit for the Radeon 4870 X2: The R700 represents just two RV770 GPUs slapped together). 4850 GDDR3 models will come with 256 MB or 512MB of GDDR3 memory, clocked at 1.14 GHz (2.29 GTransfer/s), resulting in a memory bandwidth of 73.2 GB/s. 4850 GDDR5 versions integrate 512 MB of GDDR5 memory clocked at 1.73 GHz (3.46 GT/s), supporting a bandwidth of 110.5 GB/s. 4870 GDDR5 models will get 1 GB of memory clocked at 1.94 GHz (3.87 GT/s), achieving a maximum bandwidth of 123.8 GB/s.

Flagship dual-GPU 4870 X2 cards will include 2048 MB of GDDR5 memory clocked at 1.73 GHz. The Radeon HD 4870 X2 will be introduced at a later date (and could see spec revisions).
Here's a quick overview:
  • Radeon 4850: 650MHz GPU, 850MHz shaders, 256-bit memory bus, 256MB or 512MB GDDR3 clocked at 1140MHz or 512MB GDDR5 clocked at 1730MHz, 110W TDP (sub-100W for the 256MB GDDR3 version), single-slot cooling. Prices: 4850 256MB GDDR sub-$200, 4850 512MB GDDR3 $229 and 4850 512MB GDDR5 $249-269.

  • Radeon 4870: 850MHz GPU, 1050MHz shaders, 256-bit memory bus, 1GB GDDR5 clocked at 1940MHz, 150W TDP, dual-slot cooling. Pricing: $329-349.

  • Radeon 4870 X2: 512-bit memory bus, 2GB GDDR5 memory clocked at 1730MHz, better scaling than the Radeon HD 3870 X2. Priced at $499.

  • About the Author

    Thomas De Maesschalck

    Thomas has been messing with computer since early childhood and firmly believes the Internet is the best thing since sliced bread. Enjoys playing with new tech, is fascinated by science, and passionate about financial markets. When not behind a computer, he can be found with running shoes on or lifting heavy weights in the weight room.

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