HD WD740 (Raptor) e Jumpers...

[Alfmyk]

Ciao.

Ho acquistato un 2 Hard Disk SATA WD740 (Raptor) Western Digital, che mettero su una Asus A8V-E Deluxe appena arriva... :grrr:

Premesso che prima di ora NON ho mai usato un SATA ma sempre EIDE, vedo comunque che c'e' un Jumper di configurazione, chiaramente che non ha un uso Master / Slave come nel caso EIDE.

Sul disco c'e' scritto che il jumper messo serve per DISATTIVARE (Disable) SSC (Spread Spectrum Clocking) ? :boh: Che vuol dire ? Qualcuno sa dirmi qualcosa ? Inoltre mettendo un Jumper sul altri due pins (3 e 4) si ABILITA (enable) il PM2 (Power Up in Standby) ? :boh: Anche qui' qualcuno ha informazioni ?

Grazie per risposte.

Al.

 

[Toby]

Tratto da Western Digital ;)

http://www.wdc.com/en/library/eide/2579-001037.pdf

http://www.wdc.com/en/products/Products.asp?DriveID=65

Qui trovi tutte le info che possono servirti.

 

[Alfmyk]

Ok, grazie 1000 per i links :)

Pero' pur leggendo non mi e' chiaro l'utilizzo del
SSC (Spread Spectrum) cosa sia... A cosa serve... Boh ? :boh:

Ciao,

Al.

 

[jack83]

Description of Spread Spectrum Clocking:

Computer electronics utilize “clocks” that alternate electricity to synchronize bits of data as they move from one circuit in a device to another. Similar to radio waves, these “clocks” have a certain frequency of energy radiated that can interfere with another device in the vicinity. This radiation is referred to as electromagnetic interference, or EMI.

The Federal Communications Commission (FCC) regulates broadcast emissions, such as radio and TV, as well as EMI emissions that may interfere with them. Computer and other electronic devices must meet certain requirements to limit the level of EMI they radiate. The design of a device must be changed to meet these requirements or be in violation of FCC regulations. The concept of spread-spectrum clocking is gaining popularity as a simple way to lower EMI, which is becoming more severe as processors and their “clocks” increase in speed. This method is an alternative to major design changes, which may be costly and require limiting the performance of a device. Spread-spectrum clocking speeds up and slows down the clock within a few percent of its target frequency, thus flattening out the EMI peak by spreading it across a range of frequencies.

Fluctuating the clocking speed must be tolerated by other circuits and devices involved, otherwise the devices lose their synchronization and may not communicate properly. As long as the devices are synchronized, they will communicate properly without it being necessary to lower the clocking frequency, which in turn lowers performance.

The effect of Spread Spectrum Clocking on drive/computer performance:

Spread-spectrum clocking does nothing more than help a device lower its emissions to meet FCC regulations. A computer may not need spread-spectrum clocking enabled to pass FCC regulations. Having spread spectrum clocking enabled does not affect performance. However, it requires that other devices involved tolerate fluctuating the clocking. If your Serial ATA controller or controller card do not support SSC, you should leave the jumper shunt on your WD Serial ATA drive in the SSC disabled position.

 

[jack83]

io ho 2 raptor in raid 0 e i jamper li tengo nel cassetto della scrivania...

 

[Alfmyk]

Ciao Jack 83.

Grazie per la risposta. Sono riuscito a ricordarmi a vederla
solo ora. Pardon.

Quindi in sostanza DISABILITANDO lo Spread Spectrum Clocking si
potrebbe avere (in teoria) un piccolo aumento di performance a rischio
di una maggiore emissione di "rumore" elettromagnetico. (EMI).

Provero' a fare come hai fatto tu: levo i jumpers e vedo che non ci siano
problemi di funzionamento e di interferenza. E spero ci sia un aumento delle
performances (anche se minimo) :)

Ti faro' sapere. Tra l'altro nella scheda madre ASUS A8V-E Deluxe esiste
lo stesso tipo di "setting" relativo al SSC per la CPU. Disabilitero' anche quello
:D Provo e poi vedo di non avere instabilita' e di vedere se effettivamente
ci sono migliorie nelle prestazioni.

Alla prossima.

Alf.