Memory Bandwith!!!

[fazz]

MikeB said:

@ selnor

The linked post I agree with:

"So what exactly is XDR ram? Here are some of the highlights:

* XDR makes PS3 super effiecient
* XDR aids in faster cache mapping, both direct and indirect
* XDR ram works by a pointer to pointer technology and needs very small buswidth for execution
* XDR is not just faster than GDDR3 but it is much more efficient
* XDR RAM works by breaking down data into several packets which prevents data loss and exceptions"

That's insightful. The Red Faction guys didn't talk about the possibility of using harddrive caching to their advantage, probably due to the Arcade 360 specifications lacking a harddrive they won't rely on this memory advantage.

No matter how efficient XDR is, it would not beat GDDR3 at 256 bit at the speed PS360 have. XDR has a bandwidth of around 25GB/s. If the PS360 had used their GDDR3 on 256 bit, it would be around 42GB/s. No efficiency can beat that difference.

And let's not talk about GDDR4 and GDDR5.