4 Replies Latest reply on Dec 10, 2008 10:54 PM by michael.chu

    Stream  versus Radeon HD4800 series

      req detailed feature comparison

      Forgive me, I did do a search, but I did not find the specific comparison I'm after. I get the impression that the 4800 is supported, but some posts have mentioned missing features in some Radeon processors.

      1. Will an HD4800 processor provide full support of all the features of the SDK? I know what random access means, but I do not know the term "scatter."

      2. If 4800 supports all programming features, why does the Stream exist? Lower power/flop?

      3. How many gflops for Radeon 4870X2 , Firestream 9270 ?

      4. Does either use ECC in the board memory? If not, I may as well not use ECC in the machine either.

      5. How much CPU is required to support?  Is Athlon AM2+ 5600 dual core enough?

      6. Can HD4800 simultaneously provide general purpose 2D VGA display while running sim?

      I am thinking that, although I have an interest in hydrodynamics, I would like to stay familiar with pop culture by playing some games. But not if the simulation takes a big hit.  I am thinking of a 4870x2.

        • Stream  versus Radeon HD4800 series
          1) Scatter is equivalent to random access writes, gather is random access reads.
          2) The stream processor provides among many other things more ram, better warranty and support.
          3) The 4870x2 and 9270 both have peaks of 2.4 teraflops
          4) I don't think so, but don't know for sure.
          5) There is currently no minimum CPU requirements that I know of.
          6) Depending on the length of the kernels. A long running kernel will starve the OS of VGA updates.
          • Stream  versus Radeon HD4800 series
            According to the 9270 page.

            It is three years of product repair/replacement, enterprise level support and toll free access. Also the firestreams are made by AMD and not third party vendors.

            The Firestream 9270 is designed for stream computing by AMD whereas the Radeon's are gaming cards that can also do compute. I do not work on the firestream team so I really don't know much more than what is on the above site.
              • Stream  versus Radeon HD4800 series
                Hi rmorein,

                The FireStream product line has a specific target market which is pure stream computing and HPC. It therefore tries to make product decisions based on that market, such as different cooling solutions, form factors and memory on board. The Radeons are manufactured by different manufacturers (such as Sapphire, etc.) and sometimes they choose to increase the amount of memory placed on the card in addition to what is spec on our reference design and occasionally that causes the memory capacity offered to intersect with the FireStream. However, ultimately Radeons have a primary target focus of graphics and product offerings will be based on that target.

                That being said, the FireStream product team is singularly focused on stream computing and makes its product decisions based on that. And, for commercial customers and cluster systems, the support of the FireStream is what customers will be looking for to fulfill their commercial needs.