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[WCCFtech] AMD Low Power Mullins and Mainstream Beema APU Detailed – Powered With PUMA+ x86 and GCN Cores, Launches Tomorrow - Page 16

post #151 of 170
Quote:
Originally Posted by maarten12100 View Post

If seronx is right about a lot being disabled and the possibility of it getting enabled later on I can see big gains. But to be honest I have been a "I want to beleive"er for 2 generations namely Piledriver and Steamroller both have been a letdown to be honest.

If Excavator adds all those things and enables large parts of the allegedly disabled steamroller die I can see it becoming better competition. Maybe we will get some info tomorrow.

Steamroller so far has been a good improvement with 30% increase in IPC. However due to lower clock speed it was more like 10% but if they maintained the same clocks it would have been much higher. The question now is where are AMD going with this and what comes next?
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post #152 of 170
Quote:
Originally Posted by maarten12100 View Post

If seronx is right about a lot being disabled and the possibility of it getting enabled later on I can see big gains. But to be honest I have been a "I want to beleive"er for 2 generations namely Piledriver and Steamroller both have been a letdown to be honest.

If Excavator adds all those things and enables large parts of the allegedly disabled steamroller die I can see it becoming better competition. Maybe we will get some info tomorrow.

SR as a design seems fine to me,it is a solid step in the right direction, the big let down is the apparent lack of o/c headroom compared to PD (probably process related) and the abyssmal market footprint it has, found only a couple of desktop SKUs, thats really bemusing.

I don't believe SR has disabled parts. I am talking about this thing:

http://crazyworldofchips.blogspot.gr/2013/05/amd-steamroller-die-shot-leaked.html

It most certainly is a bulldozer descendant while not being BD,PD or SR. It has to be excavator. We do know EX will support AVX2 (hence the 256-bit unit in the photo) and the whole design jives with this analysis (Agner Fog helped with this article and I trust his findings) on SR shortcomings found here:

http://www.extremetech.com/computing/177099-secrets-of-steamroller-digging-deep-into-amds-next-gen-core


If they ameliorate the cache issues and integer perf rises as expected, an EX FX made at 20nm or 14nm ,with 8 beefed up modules, and a new platform with DDR4 support will be quite competitive.
Edited by Kuivamaa - 5/4/14 at 6:17am
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post #153 of 170
PD to SR IPC increase was nowhere near 30%. The average from sites that did testing on it (clock for clock) came to around 7-10% on average across many CPU benchmarks and tests. And that difference was of course reduced to pretty much zero due to the lower clocks in normal testing (not clock for clock).
 
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post #154 of 170
It was 5-10% in ST and 10-25% in MT, clock for clock. There were regressions in few cases, though.
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post #155 of 170
Thread Starter 
Quote:
Originally Posted by Alatar View Post

PD to SR IPC increase was nowhere near 30%. The average from sites that did testing on it (clock for clock) came to around 7-10% on average across many CPU benchmarks and tests. And that difference was of course reduced to pretty much zero due to the lower clocks in normal testing (not clock for clock).
The gains indeed looked very well frail to me I can see it being great at low clocks trumping Piledriver by a lot but per cycle performance hasn't increased if I didn't know better and hadn't checked the cache benches I would even say that AMD only took piledriver and put it on GF28SHP node. The better multi core scaling also didn't really get there.

I was certainly a bit dissapointed with Kaveri's cpu performance.
post #156 of 170
More 10% in MT apps (without 7-ZIP and WinRAR) and 6% in game at same clock :



http://www.hardware.fr/articles/913-6/cpu-frequence-egale-turbo.html

Gobal average :


Apps


Games
Edited by Olivon - 5/4/14 at 6:57am
post #157 of 170
Thread Starter 
I have no intentions to rain on AMD's parade Kaveri will be an amazing chip for both low power desktop as notebooks. The power improvements and the amazing graphics capabilities (which could have been even better if better ram and interface was used) will ensure that Kaveri is the most efficient chip in those things. But for pure cpu performance even in super well threaded benchmarks so not something like 7-zip which is a single threaded bench used beyond practical use it was a failure.

I don't speak for only for myself there is a fair share of this forum that expected gains in the ~20% over Piledriver yet it barely even managed to get those gains over Bulldozer.
post #158 of 170
Best case was well above 20% (encoding and encryption especially). Worst case was regression


http://us.hardware.info/reviews/5156/43/amd-a10-7850k-kaveri-review-amds-new-apu-steamroller-vs-piledriver
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post #159 of 170
I dont see how Steamroller/Kaveri is power efficient when its still slow at normal desktop usage speed.
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post #160 of 170
Thread Starter 
Quote:
Originally Posted by NuclearPeace View Post

I dont see how Steamroller/Kaveri is power efficient when its still slow at normal desktop usage speed.
It scales extremely well on low clocks for example going from 4GHz to 3GHz cut the power consumption in 2/5th. It has better graphical performance than Iris Pro chips. It is the most efficient APU in terms of flops out there. If we only use cpu numbers for the comparison then yes Kaveri isn't the most efficient(still very very good in terms of efficiency) but if we include the gpu which takes up half the die Kaveri is super efficient.

Either way let's not drift too much Beema and Mullins are primarily what this topic is about.
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