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[RealWorldTech]AMD’s Jaguar Microarchitecture - Page 2

post #11 of 54
I didn't realize there were that many things that were similar to K8; that may explain why IPC is so similar to K8 as well.
 
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post #12 of 54
Good read, but I've always felt that RWT had an underdog bias. Not necessarily a bad thing, but they don't really present the facts. Way more objective than most tech journalism out there though.
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post #13 of 54
Ok read it and say it was a touch above my level but good enough to see and understand the improvements. I like the conclusion and the changes the consoles might play into the life of the Jaguar SoCs
post #14 of 54
Can't wait for AMD tablets with GCN cores, hopefully matching Intel's Atoms in CPU power and surpassing in GPU. There are lots of cheap Intel powered x86 Windows tablets but I'm waiting for an AMD one simply because of their superb GPU's.

Edit: after reading the article twice I can say it was way over my head.
Edited by Liranan - 4/1/14 at 8:15pm
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post #15 of 54
Quote:
Originally Posted by Nintendo Maniac 64 View Post

I didn't realize there were that many things that were similar to K8; that may explain why IPC is so similar to K8 as well.

K8 is wider and generally has better IPC than Jaguar, at least when running applications that don't see much benefit from instructions it doesn't support.

Anyway, some similarities aren't unusual, and you can look at almost any current architecture and see how it evolved, or borrows, from much older ones.
Quote:
Originally Posted by HanSomPa View Post

Good read, but I've always felt that RWT had an underdog bias. Not necessarily a bad thing, but they don't really present the facts. Way more objective than most tech journalism out there though.

Well, this article doesn't mention performance much at all and the bulk of comparisons are between Jaguar and Bobcat; not much room for bias here.
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post #16 of 54
Quote:
Originally Posted by Blameless View Post

K8 is wider and generally has better IPC than Jaguar, at least when running applications that don't see much benefit from instructions it doesn't support.
On the contrary, I find that my Brisbane performs slightly slower per-GHz than Jaguar in the few CPU benchmarks I've tested, in particular I distinctly remember being ever so slightly slower in Cinebench r11.5.
Edited by Nintendo Maniac 64 - 4/1/14 at 10:48pm
 
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post #17 of 54
Quote:
Originally Posted by Nintendo Maniac 64 View Post

On the contrary, I find that my Brisbane performs slightly slower per-GHz than Jaguar in the few CPU benchmarks I've tested (Cinebench 11.5 comes to mind).

Are you taking into account that most Jaguars have twice as many cores as Brisbane? The results I've seen do put Cinebench IPC very similarly to Jaguar, but Cinebench isn't the only test out there. A 2x2GHz Brisbane is only slightly slower than a 4x1.5GHz Jaguar in 7-zip.
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post #18 of 54
I said IPC in my first post in this thread. IPC typically refers to performance per GHz per core.


(yes I realize it technically stands for "Instructions Per Clock" or "Instructions Per Cycle")
Edited by Nintendo Maniac 64 - 4/1/14 at 11:16pm
 
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post #19 of 54
Quote:
Originally Posted by Nintendo Maniac 64 View Post

I said IPC. IPC typically refers to performance per GHz per core.

Yes, typically it does. Just making sure we are on the same page.

What sort of Cinebench score are you getting on your Brisbane anyway?
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post #20 of 54
Here's my post on the subject from a year ago:
http://www.overclock.net/t/1364086/sweclockers-amd-temash-apu-a6-1450-in-cinebench-r11-5/30#post_19371626
Quote:
Originally Posted by Nintendo Maniac 64 View Post

That Cinebench result is darn near exactly the same as what I get on my Brisbane. I think it's safe to say that Jaguar's IPC is nearly equal to K8.

64bit, 1 core(s), Brisbane @ 3.0GHz:: 0.717530
64bit, 2 core(s), Brisbane @ 3.0GHz: 1.425410

Do some math...
Bisbane multi-core scaling: 99.32755425%

Now divide the single-core result by 3 for an estimated 1GHz score:
64bit, 1 core(s), Brisbane @ 1.0GHz: 0.2391766667

Multiply by 4 to simulate 4 cores: 0.9567066667

Finally multiply by 0.9932755425 to simulate multi-core effeciency:
64bit, 4 core(s), Brisbane @ 1.0GHz: 0.9502733334


Needless to say, a 0.04 point difference between Brisbane and Jaguar is pretty spot-on. I would imagine that a K8 CPU that had the full 1024KB of L2 (such as a Toledo 4800+) would make up that point difference and match Jaguar.
 
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4x4GB Corsair Vengance DDR3 @ 1800MHz 1.504v Crucial M500 480GB SSD RamDisk - adaptive 10GB volatile scratch LG Blu-ray drive 
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Cooler Master X6 Elite with stock fan removed CPU fan: 120mm Arctic F12 PWM @ ~300rpm PSU fan: 120mm Kingwin case fan via PSU fan plug Windows 7 Ultimate - 64bit SP1 
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HDMI audio-out to HDTV HDTV optical-out to Denon AVR-200 reciever 
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