---------- Original message ---------- Subject: Re: Which is a faster option? Date: Donnerstag, 10. September 2009N From: "Mac User #330250" <[email protected]> To: [email protected]
> Like coding a video, the decoding of it is also mostly CPU work at first, > the decoded data gets then distributed to the graphics card via, as you say > rightly, the memory over the system bus over to the graphics card. > > But that's normally not the bottleneck. > The conventional PCI bus can transfer 133 MB/s of data. PC100 SDRAM has a > peak transfer rate of 800 MB/s. > > According to > http://www.blackmagic-design.com/de/support/detail.asp?techID=30 the the > most out of a HD video (1920x1080, 10-bit, 60fps) would require 237 MB/s. > Thus, for transferring decodeded HD material, you need a faster system bus. I forgot to check: AGP (original AGPx1) has a transfer rate of 266 MB/s, so getting the decoded pictures to your AGP graphics card shouldn't be a problem. > So, yes, it's not always the CPU. But I bet that a PowerPC below 1 GHz is > not even able to decode a HD video with this resolution out of an > MPEG-4/AVC or H.264 stream. So, the CPU remains the bottleneck. > Cheers, > Andreas. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g3-5-list -~----------~----~----~----~------~----~------~--~---
