AMD APU-Llano,Trinity/Richland,Kaveri/Carrizo,BristoRidge

[Maor]

http://www.fudzilla.com/news/graphics/3 ... id=dlvr.it

Fudzilla spekuluje na APU s HBM pamětí. Podle mě nesmysl, za rok budou HBM pořád luxusní zboží, co APU zbytečně prodraží. Jedině v semicustom

[DOC_ZENITH]

Nesmysl to neni, ale byla by to jiná cenová i výkonnostní kategorie. Ano šlo by udělat APU s HBM, ale aby je zasaturoval, muselo by samotné GPU být alespoň střední třídy a ne low-end. Tzn bylo by to drahé a po GPU stránce výkoné, bohužel, po CPU stránce by to bylo epic fail takže to nemá smysl.

[del42sa]

2017 AMD HPC APU
-Next Generation FirePro and Opteron
-200~300W TDP

http://pctforum.tyden.cz/viewtopic.php? ... 5#p8794905

[del42sa]

nějaké testy Carrizo vs Haswell:

http://browser.primatelabs.com/geekbenc ... ne=2080848

http://browser.primatelabs.com/geekbenc ... ne=2128686

[del42sa]

Ještě k rozbitému managementu u Kaveri :

Originally Posted by Thevenin View Post
Steamroller designs will lock the CPU frequency to levels below the advertized base clock frequency when there is GPU activity.

This "feature" cannot be turned off and it has nothing to do with the power limitations.

Even when the CPU is sitting in idle and the GPU is stressed slightly (let´s say worth 50% of it´s TDP allocation) the CPU will be throttled down immediately. The CPU frequency will stay locked until the GPU stress is released.

The only way around it is to reconfigure the "throttling to pstate" to the same frequency and voltage setting as the base frequency pstate.

The normal throttling behavior is completely different.
When the CPU exceeds it´s power allocation it will start shuffling down the available pstates until the power consumption has fallen below the set threshold.

The GPU throttling will cause the CPU pstate to jump (instead of shuffling) immediately from 0 to 4.

Jen připomínám, že Carrizo má uplně nový power management.

[maltra]

Parametry APU A10-7870K: o 20% rychlejší GPU, turbo 4,1 GHz, silnější chladič - http://www.cnews.cz/parametry-apu-a10-7 ... si-chladic

[flanker]

A zítra recenze

[flanker]

dnes uvedeno trochu v tichosti APU A10-7870K Kaveri nové revize. Recenzi jsem zatím našel jen jednu:

http://www.computerbase.de/2015-05/amd- ... -test-apu/

[DOC_ZENITH]

Výkon povyrostl o sub 5% a spotřeba v kombinované zátěži CPU/GPU povyrostla více jak výkon, ala prostě lehouliké OC stejného křemíku, proč tohle vůbec vydávali? Chudáci recenzenti taková práce pro nic. Na tohle nikdo ani z vlaku neplivne.

[flanker]

nene, bonus je nová revize, jenže zde např nedělali OC, OC by údajně měl být cca +200 MHz, i když to bude zajímavější třeba pro Athlon 870K, kterej se chystá.

[flanker]

To nezní špatně pro 7870K (hurá, to bdue fajn OC a sranda v testech):

Based my own tests on several different types of "Godavari silicon" the 7870K´s do indeed overclock better than Kaveri.
For the CPU part the average difference is around 300MHz, 200MHz for the CNB part and around 100MHz for the GPU.
The absolute clock ceiling for the CPU will be around the same (< 4800MHz) as it is process limited but Godavari will be able to do the same clocks as Kaveri with significantly less voltage.

The average clocks you can expect with a high-end motherboard and cooling are up to 4500 - 4700MHz for the CPU, 2100 - 2200MHz for CNB and 1040 - 1114MHz for the GPU. Compatible (Samsung or Hynix based) memory should run stable at 2400MHz without even touching the UNB voltage (CNB/GNB).

Both Kaveri and Godavari are extremely sensitive to fluctuations in CPU core voltage.
Since Godavari clocks higher than Kaveri it is even more sensitive to the fluctuations as the tolerance decreases at higher frequencies.
For that reason the load-line must be calibrated extremely accurately. At higher clocks you want the core voltage to stay within 15mV of the set-point even during the maximum loadstep. Both undershoot (droop) and overshoot hurt equally so simply maxing out the load-line control is not advised. Usually the -60% setting works the best.

Due the sensitivity to both voltage stability and other voltage characteristics the VRM plays a huge role when these parts are overclocked.
On a high-end motherboard with a digital VRM on it a chip might do 4.7GHz with just 1.45V. On a different lower-end motherboard the same chip might require 1.5V for 4.5GHz and be unable to reach any higher in otherwise identical conditions.

The CPU frequency usually reaches it´s peak at 1.45V - 1.475V depending on leakage.
It will accept higher voltage but usually the returns are non-existent. There is absolutely no point in trying to force the chip to do higher than xMHz if it requires more than 1.475V (actual).

The default voltages on 7870K´s are extremely high but also extremely conservative at the same time.
This means that there is a huge amount of undervolting potential in these chips. Not just for the CPU but for the UNB also.
On average the CPU requires around 200mV less voltage (abs. 1.2 - 1.25V) for the base frequency of 3.9GHz than the factory values indicate.
For the UNB the number is around 125mV (abs. 1.150V)

The power savings from undervolting are quite impressive.
The measurements are DCR (current over inductors) meaning they represent the actual power consumed by the APU.

Stock vs. Tuned voltages:

Pb0 (4100MHz) = 1.43750V vs. 1.1960V
P0 (3900MHz) = 1.38750V vs. 1.1530V
P1 (3800MHz) = 1.35000V vs. 1.1180V
P2 (3700MHz) = 1.30000V vs. 1.0960V
P3 (3500MHz) = 1.23750V vs. 1.0640V
P4 (3000MHz) = 1.08750V vs. 0.9630V
xx
xx

GNB (CNB + GNB) during 3D = 1.27500V vs. 1.0480V

Test: 3DMark11 Performance

Stock PMax VDD_CR DCR = 52.125W
Stock PMax VDDNB_CR DCR = 47.6875W
Total = 99.8125W

UV PMax VDD_CR DCR = 36.250W (-30.46%)
UV PMax VDDNB_CR DCR = 35.625W (-25.3%)
Total = 71.875W (-28%)

Test: 3DMark Sky Diver

Stock PMax VDD_CR DCR = 55.125W
Stock PMax VDDNB_CR DCR = 48.625W
Total = 103.75W

UV PMax VDD_CR DCR = 36.8125W (-33.21%)
UV PMax VDDNB_CR DCR = 37.1875W (-23.52%)
Total = 74.0W (-28.7%)

Test: 3DMark Fire Strike

Stock PMax VDD_CR DCR = 47.750W
Stock PMax VDDNB_CR DCR = 46.760W
Total = 94.51W

UV PMax VDD_CR DCR = 32.3125W (-32.33%)
UV PMax VDDNB_CR DCR = 35.000W (-25.15%)
Total = 67.3125W (-28.8%)

Test: Cinebench R15

Stock PMax VDD_CR DCR = 61.0625W

UV Pmax VDD_CR DCR = 35.6875W (-41.6%)

http://www.overclock.net/t/1555615/amd- ... t_23963448

[yuri.cs]

Carrizo/Excavator oficialne venku

slajdy:
http://www.pcgameshardware.de/CPU-Hardw ... e/2382049/

BKDG:
http://support.amd.com/TechDocs/50742_1 ... h_BKDG.pdf

[del42sa]

celkem by mě zajímalo, kdy se z těch původně 4-5% lepšího IPC u XV stalo těch up to 15% IPC ??? ( jinde zase uvádějí 9 - 13% IPC )

tak jako tak, ale Carrizo vypadá jako velice zajímavý produkt do notebooků

[havli]

pff, porad horsi IPC nez C2D, naprosto nepouzitelna vec. Intel nema podil na trhu mobilnich CPU pres 90% jen tak nahodou. Tohle na tom nic nezmeni.

[del42sa]

Major Changes
This section describes the major
changes relative to Family 15h
Models 30h-3Fh Processors.
CPU core changes:
• IPC/Architectural changes to improve SMT performance.
• Enhanced RAS support.

GNB.
• Volcanic Islands tiles.
• NBIO adds data poisoning support.
• ECC on SMU code space.

FCH.
• Integrated FCH core.
• AOAC support.
• 8 USB2 ports.
• 2 SATA Gen 2 ports.

UNB.
• Data poisoning support.
• Parity on all macros with power gating support.
• ONION 3.0 bus (HSA).
• Unified memory controller capable of supporting DDR4 and DDR3

[del42sa]

Carrizo Dieshot

pro porovnání Trinity Dieshot

[flanker]

7870K koupen, dle Stilta je OC lepší, snad se o tom přesvědčím já také

[del42sa]

Godavari má letovaný IHS, velmi dobré teploty oproti Kaveri. Takže to není novým steppingem, ale letovaným rozvaděčem tepla

http://semiaccurate.com/forums/showthread.php?t=8709

[maltra]

Pribudlo par dalsich testov APU:

Recenzia od Holandanov - http://nl.hardware.info/reviews/6110/am ... je-sneller
Anandtech - http://www.anandtech.com/show/9307/the- ... -a10-7870k
Nejake testy na Linuxe - http://www.phoronix.com/scan.php?page=a ... 870k&num=1
Minitest - http://www.cclonline.com/article/1719/R ... 0K-Review/
Minitest - http://laptopmedia.com/review/amd-a10-7 ... n-is-here/

[flanker]

Tady je krasavec