| Trunkin said: I see. Sounds like they're performing some technical gymnastics make this work. I thought it was wierd that you're required to redownload a game for it to run. IIRC, PC emulators like PCSX2 let you play games straight from their original discs. I also didn't realize the the Xbox One was using ESram. All this time I thought it was ESram in the 360 and EDram in the XBOne. As I don't really know anything about the technology, I saw the bigger number and assumed EDram to be superior. Though from your post I take it ESram supports simultaneous read/write or something like that? |
I don't know how often simultaneous read/write operations can be used, it sounds more like a way to make the final number sound better. 204 GB/s sounds better opposed to the 176 GB/s unified memory speed of the ps4.
Now I look into it I might be wrong about the edram from the 360. The 256 GB/s is only internal inside the memory logic (whatever that means) It seems the bandwidth to the GPU was only 32 GB/s. ESram communicates at 102 GB/s with the GPU and has the potential to go over that with simultaeneous read and write operations where possible.
From wikipedia (take it with a grain of salt I guess)
The eDRAM internal logic to its internal memory bandwidth is 256 GB/s. The high bandwidth is used primarily for z-buffering, alpha blending, and antialiasing; it saves time and space on the GPU die. Between the eDRAM die and the GPU, data is transferred at 32 GB/s.[7] The memory interface bus has a bandwidth of 22.40 GB/s and the Southbridge a bandwidth of 500 MB/s.
So I guess games that rely heavily on those 3 operations in EDram need a bit of extra work to emulate.
