lwilliams3
Member
I like to thank everyone that has properly contribute to this thread. It has been very informative, and I'm glad that bringing up Latte's possible connection to Brazos had resulted to some good discussions.
That story about Brazos is cool. Do you have a link to that story? It seems to be a processor that punches above its weight. How is its performance compared to the other GPUs in the r700 series?
Yeah, people got a little carried away while the tech heads were gone.
Brazo actually does do some GPGPU things, in fact a university decided to use this processor and ended up nearly doubling the compute speed of every day use thanks to some home made drivers using the GPU for GPGPU tasks whenever possible.
Not sure Renesas is really going to offer that big of a difference, that is part of the point I'm trying to make, since they are so great at memory modules, is it also possible that the count of the registry is wrong and they are using larger modules there? they have always looked bigger to me compared to the brazo shots. Even if it isn't there is the possibility that the cache doesn't need to be as big thanks to not doing all the things a GPU normally does (mostly in video land here) as well as having all the extra eDRAM and SRAM on chip in other places.
The power consumption is the last thing I would use to attribute to only having 160ALUs, the targeted low clock, mature 40nm process using a low power format as well as it being on a MCM, it could be saving quite a bit of power, every power consumption guess I've seen never takes those things into account.
Mem 0 could be used for a number of things, my guess is that it is being used exactly like Gamecube's texture memory, as the edram should be large enough to cache the cpu pool as needed, leaving the faster latency SRAM for heavy latency GPU specific things. As I mentioned above I also think some of this memory can be used in place of some registry space, such as GPGPU instruction caching, or a number of other tasks that you would want quick access to but doesn't need to be exactly immediate.
Disclaimer: Although I do some light programming, this is a hobby for me and I do not have a computer science degree, nor do I code in OpenCL.
That story about Brazos is cool. Do you have a link to that story? It seems to be a processor that punches above its weight. How is its performance compared to the other GPUs in the r700 series?