| [News] Transcript of Alan Redhouses speech at AmiGBG 2003 | ANN.lu |
| Posted on 31-Mar-2003 19:40 GMT by Peter Gordon | 54 comments
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I have transcribed Alans AmiGBG speech. It can be viewed here.
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| Transcript of Alan Redhouses speech at AmiGBG 2003 : Comment 13 of 54 | ANN.lu |
| Posted by Anonymous on 01-Apr-2003 01:39 GMT | Great transcript, thank you very much for the effort!
What did Alan mean with just 3% speed gain through L3 cache?
On Macs it makes quite a difference and games (Hyperion!) like Quake3 benefit
greatly from it. Some examples of iMac 1GHz w/o L3 cache vs. PowerMac 1GHz with
(just) 1MB L3 cache [c´t 6/2003 page 108]:
Cinebench 2001
Shading (C4D): 7.44 vs. 8.08
Shading (OpenGL): 9 vs. 9.79
Photoshop 7
Action 1: 23s vs. 20s
Action 2: 48s vs. 42s
iTunes
MP3 encoding: 5min48s vs. 4min40s
Quake3
Demo Four 68: 67.7fps vs. 82.9fps
Quicktime
Sorenson 2: 3min vs. 2min47s
Sorenson 3: 1min16s vs. 1min09
Both had the same gfxcard (GF4MX 64MB DDR) and memory subsystem (PC2100).
http://www.xlr8yourmac.com/G4CARDS/giga_designs_800_1ghz/index.html shows
that L3 cache can make an average difference of well over 10% (please also
notice the extreme Q3 and UT results...).
http://macspeedzone.com/ ist another source for comparative numbers.
http://www.powerlogix.com/downloads/SDRDDR.pdf comes to the following conclusion: "Clearly it is important to have some sort of L3 cache, but the type and
speed of the L3 are almost irrelevant. In fact, the only factor that matters to any degree, is
L3 cache size, and even that is not a huge difference"
So _if_ Alan only gets 3% performance gain from L3 cache there must be something
wrong with AmigaOne - also the G4 working only up to 40 degrees sounds like a
joke since the CPUs are specified for at least 65 degrees operation. |
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