AMD novinky CPU/grafické karty -infa, recenze

[akem]

Jen intel nikde netvrdí, že má 8 jader... má jasně definované HT

//
Ano, kdyby intel tvrdil, že je to 8mijádro, tak je to podnod, protože fyzicky žádných 8 jader nemá, kdežto AMD těch 8 jader má, to je jako tvrdit, tě Pentium N není čtyřjádro, protože má slabý výkon a převálcuje ho kde jaké stará C2D...
//Martab

[Reklama]

[FlanK3r]

je to prostě trochu trapné napadení, protože Bulldozer je 4CU/8C, V některých přípdech zládne 8 výpočtů zaráz a v jiných jen 4. A toho se prostě někdo chytl.

[FlanK3r]

Stilt AMD mluví o problémech se změnami napětí a frekvence na deskách Gigabyte (IR kontroléry) a proč se to děje:

It has nothing to do with BCLK itself. Gigabyte bioses are completely broken and the issues are preventing the system from posting beyond certain clocks when multiplier is used to increase the clocks. They are most likely doing things in the wrong order. For example if they program the VRM controller in very late phases of the POST, it can definitely cause such issues. Most likely they are trying to run the CPU at the default voltage (ignoring all user made voltage adjustments), regardless of the clocks. After the CPU no longer can complete POST at the default voltage at the new, higher clocks you´ll see behavior like that.

In every case the CPU clocks will be programmed first. This is the reason why the system powers off when you change the multiplier and save the bios settings. In the early stages of POST, the CPU will run at clocks and voltages specified in P4 PState (on all FX-8K CPUs). After all of the CPU and chipset related parameters have been configured by AGESA then the bios should execute motherboard specific code, which may program the clock generator (set BCLK) and the VRM controller. After all of the lower level stuff has been completed, the CPU frequency will (should) be set to the normal levels (as defined by the higher PStates).

Some of the newer Gigabyte boards, such as 970A-D3P, 970A-UD3P and 990FXA-UD3 R5 are equipped with IR digital VRM controller. In order to adjust the voltage offsets, loadline or any other parameters of the controller, the controller must be programmed through SMBUS by using custom commands. So until the controller has been programmed by the proprietary code from Gigabyte, the CPU will run at the default voltages.

I think the issue is that the bios is currently executing the VRM controller programming code too late in the POST, after the point where the CPU has already been ramped to the maximum clocks.

They probably execute their code in this way:

1) AGESA (CPU, NCLK, DRAM, Chipset)
2) Exit Startup Core P-State (P4) -> P0
3) Program VRM controller through SMBUS
4) Program clock generator through SMBUS
5) Program DACs (NCT3933) for minor voltages (NB, DRAM, etc) through SMBUS

When the user has changed the P0 PState from 20x (4000MHz) to 22.5x (4500MHz) for example, the POST will most likely fail in "phase 2" when the CPU frequency ramps up but the CPU is still operating at it´s default voltage.

The issue would be most likely fixed by simply changing the execution order:

1) AGESA (CPU, NCLK, DRAM, Chipset)
2) Program VRM controller through SMBUS
3) Program clock generator through SMBUS
4) Program DACs (NCT3933) for minor voltages (NB, DRAM, etc) through SMBUS
5) Exit Startup Core P-State (P4) -> P0
Edited by The Stilt - 11/15/15 at 12:25am

[ColosalElektron]

Názor na procesor AMD Sempron 140?

[FlanK3r]

už je to old CPU, ale některé šly odemknout na dvoujádro...Pořád však lepší CPU než klasické Athlon 64 x2 procesory....

[ColosalElektron]

A aký by si odporučil novší? Nie moc drahý

[Karrex]

Na to tu máme sekci viewforum.php?f=40 .

[FlanK3r]

AMD spolupracovalo na Starwars: battlefront
Budou bundly karet Radeon R300 a Fury s touto hrou zdarma!

http://wccftech.com/amd-radeon-r9-fury- ... nt-bundle/

[Adys301]

AMD Radeon R9 380X

Dle očekávání. Nemastné, neslané, výkon jako R9 280X. Ale spotřeba je nižší.



http://www.techpowerup.com/reviews/ASUS/R9_380X_Strix/

[Andrew98]

Snad aspoň srazí dolů ceny.

[Adys301]

Ještě jeden úsměvný graf od AMD

[FlanK3r]

No ale mají pravdu, protože to může být upgrade pro lidi se staršími grafikami. Kdo má třeba GTX960, tak asi měnit kvůli 15% výkonu nebude za 380x :)
U Strix 380x mě mrzí trochu česká cena, která je na úvod tradičně přestřelená, slušela by jí cena okolo 7500-7600 Kč. Co je u ní super, že ta karta poběží většinu času v pasivním režimu! Alespon dle Techpowerup