Lisa- > True, but what I am trying to get a handle on is that > TI is big on their "BDTI benchmark" number, and claim > that you have to compare apples to apples, and that > even thought the DSP does not run as fast, it is > better suited for this stuff than a multipurpose > processor that runs faster. > > Your point about the heatsink is a good one for > example, where the Pentium would melt down without > one, the DSP is only a couple watts. I suggest to find TI and Intel benchmarks for something like 1024 x 1024 2D FFT for a 16-bit/pixel image, and convert numbers given in cycles into time using the maximum clock speeds. A usable 2D FFT would require the processor to access offchip memory (SDRAM or DRAM) which I think is very fair -- I would not use a TI benchmark where all data can be stored in onchip SRAM. I think the group would be very interested in what you can find. -Jeff P.S. I posted to the C6x group also, where there is often discussion about DSP + image/video. > --- Jeff Brower <> wrote: > > Lisa- > > > > > Hi all, I am new to the group, and would like to > > ask a question. > > > I assume you all are familar with TI's new DSP, > > the "digital media" > > > DM642. It is a member of the new C64x series DSPs, > > with clock speeds > > > up to 720MHz. > > > > > > My question is, how do you think this DSP will > > compare in machine > > > vision image processing applications to a > > "typical" desktop PC in the > > > 2 to 3 GHz range. > > > > > > I know I can't just compare clock speeds, and a > > lot depends on how > > > well the software is written, but in general, > > would this DSP be > > > slightly slower, about the same, or slightly > > faster (or something > > > else) ignoring any IO and memory bottlenecks. > > > > To ignore I/O and memory bottlenecks makes the issue > > purely "benchmark". You should > > be able to compare some benchmarks for typical > > algorithms published by Intel and TI > > and get some idea. > > > > But the real question is "what can you build". > > Issues of chip size, power > > consumption, I/O interfaces and throughput are > > critical. In our product line, the > > huge heatsink and fan make a 2.4 GHz Pentium > > impossible. > > > > Jeff Brower > > system engineer > > Signalogic |