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Forum: CPUs 01-20-2016, 01:08 PM
Replies: 1,990
Views: 265,279
Posted By gruffi
You still doubt juanrga? How dare you!

You still doubt juanrga? How dare you!
Forum: CPUs 01-07-2016, 02:29 PM
Replies: 1,990
Views: 265,279
Posted By gruffi
Not really. In fact Nvidia's margins were worse....

Not really. In fact Nvidia's margins were worse. They needed much larger chips to compete with AMD. HD 4xxx was a success on several levels, not just market share. HD 5xxx was an even bigger success.
Forum: CPUs 12-29-2015, 12:30 PM
Replies: 63
Views: 7,610
Posted By gruffi
Yeah, I was shocked too.

Yeah, I was shocked too.
Forum: CPUs 12-28-2015, 12:39 PM
Replies: 310
Views: 45,560
Posted By gruffi
Exactly. I think the cache hierarchy of the A9...

Exactly. I think the cache hierarchy of the A9 doesn't make much sense for a CPU. Maybe its L3 cache is indeed mostly dedicated to the GPU. But that's another topic.

And the cancellation of an...
Forum: CPUs 12-26-2015, 10:54 AM
Replies: 310
Views: 45,560
Posted By gruffi
No, it hadn't. In fact the original Phenom had a...

No, it hadn't. In fact the original Phenom had a very bad cache hierarchy. Phenom II was better, but still not good enough.


Btw, there were also K10 designs without L3, Regor and Propus. Propus...
Forum: CPUs 11-29-2015, 05:18 AM
Replies: 1,990
Views: 265,279
Posted By gruffi
Basically one third of all integer instructions...

Basically one third of all integer instructions are loads or stores. So, a ratio of 2:1 between ALUs and AGUs sounds like a plausible design decision, right? Didn't we have this discussion before? :D
Forum: CPUs 11-24-2015, 02:01 PM
Replies: 49
Views: 6,007
Posted By gruffi
If you have a lot of movs in your x86 code,...

If you have a lot of movs in your x86 code, maybe. But that's not the point. The actual question is, how many uops do you get from an ARM and an x86 decoder per cycle. I may be wrong, but in my...
Forum: CPUs 11-23-2015, 03:34 PM
Replies: 49
Views: 6,007
Posted By gruffi
I think we might see even 6+ decoders. Don't...

I think we might see even 6+ decoders. Don't forget, with ARM you have to decode memory instructions separately. I would say 6 ARM decoders are comparable to 4 x86 decoders. So, in my opinion 6...
Forum: CPUs 11-18-2015, 07:09 AM
Replies: 1,990
Views: 265,279
Posted By gruffi
Not just this, AMD also never said that Zen has...

Not just this, AMD also never said that Zen has been exclusively designed for servers. Zen is supposed to cover a wide range of markets, from low power mobile and embedded (Cat replacement) to high...
Forum: CPUs 11-17-2015, 03:55 PM
Replies: 1,990
Views: 265,279
Posted By gruffi
Thank you! :D Okay, and now back from...

Thank you! :D



Okay, and now back from Theoryland to the real world. One of the best general purpose CPU architectures at the moment in terms of IPC and efficiency, Cyclone. ALU/AGU...
Forum: CPUs 11-13-2015, 12:30 PM
Replies: 1,990
Views: 265,279
Posted By gruffi
Harsh, but sadly just the truth. And...

Harsh, but sadly just the truth.



And more ALUs. So, what's the outcome? In fact you don't know yet. I think it's quite pointless to compare this way. Even K8/K10 had more AGUs. Will Zen be...
Forum: CPUs 11-10-2015, 01:20 PM
Replies: 1,990
Views: 265,279
Posted By gruffi
I've told him that before...

I've told him that before (http://semiaccurate.com/forums/showpost.php?p=245835&postcount=422), Matthias. Don't argue with him anymore and put him on ignore like the rest of us here. He's resistant...
Forum: Article discussion 11-07-2015, 04:57 AM
Replies: 24
Views: 2,760
Posted By gruffi
Don't interpret too much into names. Even if it's...

Don't interpret too much into names. Even if it's called "lower power" it doesn't mean it's not suited for high performance silicon.
Forum: GPUs 11-06-2015, 02:31 PM
Replies: 71
Views: 7,511
Posted By gruffi
No way Nvidia can take over the GPU world. Nvidia...

No way Nvidia can take over the GPU world. Nvidia flops in every segment, except gaming. But the gaming situation will change with 16/14nm. And not in advantage of Nvidia.
Forum: CPUs 10-29-2015, 04:53 PM
Replies: 288
Views: 32,031
Posted By gruffi
Doesn't look like a trustworthy source to me.

Doesn't look like a trustworthy source to me.
Forum: CPUs 10-26-2015, 03:32 PM
Replies: 1,990
Views: 265,279
Posted By gruffi
Wasn't it the 3rd AGU? In fact you can...

Wasn't it the 3rd AGU?


In fact you can see K8 as an architecture with 1:1 ratio between ALUs and AGUs. But it's also a good example that such an architecture isn't well balanced for general...
Forum: CPUs 10-25-2015, 07:35 AM
Replies: 288
Views: 32,031
Posted By gruffi
http://wccftech.com/jim-keller-joining-samsung/ ...

http://wccftech.com/jim-keller-joining-samsung/

Looks like the people who said Keller is looking for a new challenge were right. And all the people with their doom and gloom predictions for AMD...
Forum: CPUs 10-21-2015, 12:48 PM
Replies: 1,990
Views: 265,279
Posted By gruffi
@Poindexter Thanks for the effort! Actually...

@Poindexter

Thanks for the effort! Actually just confirms what already has been said. A ratio of 2:1 between ALUs and AGUs is fine for a general purpose CPU. A ratio of 1:1 is quite unbalanced and...
Forum: CPUs 10-19-2015, 02:11 PM
Replies: 1,990
Views: 265,279
Posted By gruffi
Actually the optimization abilities of the...

Actually the optimization abilities of the Microsoft compiler are weak in general. I did a lot of MSC vs ICC vs GCC comparisons for AMD and Intel over the years. MSC almost always created the slowest...
Forum: CPUs 10-18-2015, 05:51 AM
Replies: 1,990
Views: 265,279
Posted By gruffi
On desktops, definitely. Sure, at the...

On desktops, definitely.


Sure, at the moment when AMD's designs are still 28nm bulk. But the situation should change with 14/16nm FinFET. Intel can't go 10nm that soon. Last rumors hint to more...
Forum: CPUs 10-17-2015, 06:12 PM
Replies: 96
Views: 20,720
Posted By gruffi
Yep, similar integer performance and ~15% less fp...

Yep, similar integer performance and ~15% less fp performance per clock compared to Apple A8.
Forum: CPUs 10-17-2015, 05:49 PM
Replies: 1,990
Views: 265,279
Posted By gruffi
Rectangular multipliers? I doubt that....

Rectangular multipliers?


I doubt that. Even Keller is no magician. And Zen probably won't use HDL to not affect frequencies. Intel's 14nm cores (Broadwell/Skylake) aren't very large, IIRC 7-8...
Forum: Process technology 10-17-2015, 05:19 PM
Replies: 133
Views: 23,137
Posted By gruffi
Do we have a cost comparison?

Do we have a cost comparison?
Forum: Article discussion 10-17-2015, 05:12 PM
Replies: 122
Views: 23,052
Posted By gruffi
In order: - wrong (it's a big core) -...

In order:

- wrong (it's a big core)
- doubtful (most likely wrong because it's a wide design with similar or even more resources than Skylake)
- wrong (it's 40% more than Excavator)
- wrong...
Forum: Article discussion 10-17-2015, 07:37 AM
Replies: 122
Views: 23,052
Posted By gruffi
"Small core (Jaguar/Puma style)" "I expect Zen...

"Small core (Jaguar/Puma style)"
"I expect Zen to be much smaller than Skylake"
"~40% IPC over Jaguar/Piledriver"
"2x128bit SIMD/FP unit"
"Each SIMD unit is 128bit FMA"
"The chances of seeing...
Showing results 1 to 25 of 500

 
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