Nintendo Maniac 64 Wrote:The easiest reference is that all three systems are fast enough to run YouTube 720p WebM via VLC, but not YouTube 720p MP4 via VLC. By comparison, my Brisbane can do YouTube 720p WebM @ 1GHz via VLC but YouTube 720p MP4 via VLC requires 1.3GHz. This is a performance gap of only 33% which is pretty small considering that's only the difference between a 2GHz Northwood vs a 2.66GHz Northwood.
Remember that the IPC difference will be different for different applications. Video encoding/decoding tends to favor the netburst architecture far more than other types of applications.
Nintendo Maniac 64 Wrote:So therefore I think it is safe to say that Atom has an IPC extremely similar to K7.
It does. Although it depends on the application and which generation of K7 you're referring to.
Nintendo Maniac 64 Wrote:Also, Brazos in my experience has an IPC that's about 75% of K8, which means the upcoming Jaguar core should have K8-levels of IPC.
1. Bobcat, not brazos
2. I really doubt that considering its IPC is ~22% higher than bonnell (atom) on average. I would expect the IPC on bobcat to be similar to K8 and jaguar to be slightly higher. But I could be wrong. I haven't crunched the numbers yet.
3. Jaguar is only going to boost IPC by 10-15% over bobcat according to amd (so likely 10% since AMD has a habit of inflating these numbers).
Atom IPC relative to P4 northwood:
3DS Max 2010
1.33
7-Zip COmpression
1.33
Adobe Acrobat 9 Pro PDF Creation
1.03
Adobe Photoshop CS4 Image Processing
1.63
WinRAR compression
1.22
WinZIP Compression
1
Fritz Chess game
1.3
iTunes Audio Encoding
0.65
Lame Audio Encoding
0.66
Mainconcept Reference v2.0 Video Encoding
1.26
Handbrake Video Encoding
1.26
Source: http://www.tomshardware.com/reviews/atom...649-7.html
Taken from tomshardware comparing single core with HT in both cases (turning off HT would yield more accurate results). As you can see it depends on the application. For some reason the P4 had a 50% higher IPC in the audio encoding tests while having a lower or similar (usually lower) IPC in everything else. This is particularly odd given that the P4 should benefit more from HT than bonnell and both audio encoders were single threaded.
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