AMD Carrizo Pre-release thread

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monstercameron

Diamond Member
Feb 12, 2013
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The designs are way too different for any kind of proper comparison. I haven't worked too much on recent Intel designs, but I would say AMD has better power management than the most recent Intel designs do. That's the result of being so far behind in both the process technology and the design itself, however that's definitely not a bad thing.

Once AMD has access to smaller manufacturing process (such as the 14nm LPP) their power efficiency will be pretty hard to compete with. Let's just hope the new architechture lives up to the expectations.

While the power management in Carrizo for example is extremely advanced and effective, there are still some things which need to be improved heavily. Basically none of the features of the power management are documented, let alone properly. Because the lack of documentation, the system manufacturers are unable to tune the power management properly to provide the best possible performance on their system.

I have personally spent maybe < 800 hours on the SMU, PMU and PMC on Steamroller and Excavator. Without the breakthroughs I made on Steamroller (i.e learnt how to program and configure the SMU) I couldn't change a single setting either on Steamroller or Excavator, despite having access to the same documents as the manufacturers do. Most of the time the stuff just isn't documented at all and when it is, it is done either poorly or just wrong.
Are these documents usually under NDA or are they open like the gcn isa docs?
 

The Stilt

Golden Member
Dec 5, 2015
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Are these documents usually under NDA or are they open like the gcn isa docs?
The public documents are somewhat stripped, however what comes in configuring the power management or programming the system management unit (SMU) the NDA and the public contain the same information (none) D:
 

FlanK3r

Senior member
Sep 15, 2009
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No rush, but its very great CPU for SUperpi. Mr Chew* or mr Stilt must to find 70 dollars and buy this CPU for late evenings :up:



I had IDE mode and the issue of this piece was IDE BCLK black screen. I tried another ways as lower RAM, lower APUNB or higher voltages at SB, VDDNB, CPU and doesnt change the issue. So this was my highest stable BCLK. I believe piece of piece of 845 Athlon will be little different. Maybe PCIe card slot with M2 could be solution (into the last PCIe x4 slot). Friend told me, old HDD raptor is more SATA stable also. I used SSD.
Seems CPU si scaling very well. Next time I must tweak the OS or to use XP for SUperpi. Clear 10 minutes is with these CPU/CPUNB clocks doable. Interesting, for this CPUNB was OK only around 1.17V! I dont tested, if CPU has coldbug or not. With few liters of LN2 I left around -50 C temperatures.

 

The Stilt

Golden Member
Dec 5, 2015
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Does it really require voltage that high, or is it just to be sure? :eek:
 

FlanK3r

Senior member
Sep 15, 2009
311
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with LN2 no problem (-50 C) I tried it with 1.55V and it hold also.
 
Apr 27, 2000
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So that was an LN2 shot, makes sense now.

btw you don't need to go as expensive as NVMe harddrives or whatever, you can just grab a cheap PCIe SATA controller and try that. Though some of those get cranky at higher PCIe speeds. The cheap-arse one I bought (that has since burned out) was good for bclk up to 119 MHz.
 
Feb 2, 2009
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Do we know if this BristolRidge Geekbench result is at 65W or 95W TDP ??
 

el etro

Golden Member
Jul 21, 2013
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It looks like it can't sustain 4Ghz on all cores being into 65W TDP.

Anyway will be a blast if efficiency goes up at this performance levels.
 

The Stilt

Golden Member
Dec 5, 2015
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It looks like it can't sustain 4Ghz on all cores being into 65W TDP.
On Carrizo holding 3.4GHz on both compute units requires around 50W TDP limit, in workloads such as Cinebench R15.

I would expect Bristol Ridge to hold around 3.7GHz on both units with it's 65W TDP limit. In combined workloads (CPU+GPU) the CPU frequency should drop to 3.1GHz region.
 
Aug 10, 2015
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If I have understood correctly, Kaveri is being produced on some custom SHP 28nm silicon, whereas Carrizo/Bristol Ridge is being produced on 28nm bulk silicon,.

As AMD will soon introduce the AM4 platform, Bristol Ridge will become the mainstream CPU for the platform and Kaveri should therefore be End-of-life.

Asuming the transition goes as planned, does anyone have a clue how much savings AMD makes in their Bill-of-materials switching their production from SHP to bulk silicon? :sneaky:
 

The Stilt

Golden Member
Dec 5, 2015
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Steamroller (Kaveri / Godavari) is / was made on GF28A, which is a tuned (custom) version of the standard GF28HPP. They are both bulk nodes, since GlobalFoundries cancelled their plans for SOI 28nm process (GF28SHP).

Carrizo / Bristol Ridge & Stoney Ridge are manufactured on the standard GF28HPP process.
 
Aug 10, 2015
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Steamroller (Kaveri / Godavari) is / was made on GF28A, which is a tuned (custom) version of the standard GF28HPP. They are both bulk nodes, since GlobalFoundries cancelled their plans for SOI 28nm process (GF28SHP).

Carrizo / Bristol Ridge & Stoney Ridge are manufactured on the standard GF28HPP process.
I understand if you can't answer this, but wouldn't it be cheaper to produce chips using the standard GF28HPP process than on the custom version?
 

The Stilt

Golden Member
Dec 5, 2015
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I have no idea what the price difference was, to be honest. I would imagine that GlobalFoundries felt pressure about increasing the prices for GF28A parts due the already low and still declining demand. Afterall only a single design was ever manufactured using the process so having a separate production line for a low volume product is not necessarily too cost effective.
 

NostaSeronx

Platinum Member
Sep 18, 2011
2,367
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I have no idea what the price difference was, to be honest. I would imagine that GlobalFoundries felt pressure about increasing the prices for GF28A parts due the already low and still declining demand. Afterall only a single design was ever manufactured using the process so having a separate production line for a low volume product is not necessarily too cost effective.
GF28A is not the complete node designation.

Qualcomm; GF28LPQ / GF28Q
AMD; GF28LPA / GF28A

LPQ = Qualcomm optimized node
LPA = AMD optimized node

The LP nodes at GlobalFoundries are copy-smart versions of SEC28LPH. SLP/HPP are pure GlobalFoundries nodes.
 

monstercameron

Diamond Member
Feb 12, 2013
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monstercameron

Diamond Member
Feb 12, 2013
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