Bitboys

[superfly]

Originally posted by Nappe1


yep, that's right.
and basically CAS1 type eDRAM has so low latency that it's almost as fast as internal registers (SRAM??) so to frame buffer use it's optimal because there's paractically nothing slowing down reads and writes to Frame Buffer. eRAMs (eDRAM, T1-SRAM, SRAM, etc.) are the way to make Super Sampling AA for free. Quality is excelent and no fps drop.

btw, that is what MatrixAA was all about.

True..but on the other hand,you're always limited by how much edram you can fit into the die and there always the tradeoff as far as features go...

Imagine the costs associated with building a Full DX9 chip,which if we look at competitors cards,already easily exceed 100 million transitors,and on top of that, adding a meaningfull amount of edram on the same package.....Yikes.

[Nappe1]

Superfly: as said, they had DX9 chip on the works and It's specs are on that article.

The idea how they used eDRAM, was very cool. in their method they didn't need to fit whole frame buffer to edram, just that part which was being rendered. That's one of the reasons why they only had 3MB of eDRAM on Hammer.

Still, because of known facts, they were forced to move on to work with PDA/Cellular Phone core. And Hammer got scrapped.