Link alla notizia : <a href="http://news.hwupgrade.it/4539.html">http://news.hwupgrade.it/4539.html</a>

Nella giornata di ieri, 10 Settembre 2001, Intel ha ufficialmente introdotto sul mercato il nuovo chipset i845 per sistemi Pentium IV e memoria SDRAM PC133, noto anche con il nome in codice di Brookdale. Questa soluzione è pensata per il mercato entry level e sfrutta la diffusa memoria SDRAM PC133, così da ampliare ulteriormente il parco macchien absato su processori Pentium IV e, progressivamente, rimuovere dal mercato le cpu Pentium III Coppermine.

<br><br><center><img src="http://news.hwupgrade.it/immagini/chipset_i845_immagine_grupp.jpg"></center><br><br>

La tabella sottostante riporta le caratteristiche tecniche comparate dei chipset i850 e i845, per sistemi Pentium IV, nonché quelle del chipset Intel i815 per sistemi Pentium III Socket 370.

<br><br>
<div align="center"><center>

<table>
<tr bgColor="lightblue">
<th bgColor="#004080"><small>Caratteristiche</small></th>
<th align="middle" bgColor="#004080"><small>Intel 815</small></th>
<th align="middle" bgColor="#004080"><small>Intel 850</small></th>
<th align="middle" bgColor="#004080"><small>Intel 845</small></th>
</tr>
<tr>
<td><small>Memory Technology</small></td>
<td align="middle"><small>SDRAM</small></td>
<td align="middle"><small>Dual Channel RDRAM</small></td>
<td align="middle"><small>SDRAM</small></td>
</tr>
<tr>
<td><small>Memory Types</small></td>
<td align="middle"><small>PC100/133</small></td>
<td align="middle"><small>PC800/PC600</small></td>
<td align="middle"><small>PC133</small></td>
</tr>
<tr>
<td><small>Peak memory B/W</small></td>
<td align="middle"><small>1.06GB/sec</small></td>
<td align="middle"><small>3.2GB/sec</small></td>
<td align="middle"><small>1.06GB/sec</small></td>
</tr>
<tr>
<td><small>Max memory</small></td>
<td align="middle"><small>512MB</small></td>
<td align="middle"><small>2GB</small></td>
<td align="middle"><small>3GB</small></td>
</tr>
<tr>
<td><small>AGP</small></td>
<td align="middle"><small>AGP4X</small></td>
<td align="middle"><small>AGP4X</small></td>
<td align="middle"><small>AGP4X</small></td>
</tr>
<tr>
<td><small>I/O</small></td>
<td align="middle"><small>ICH2</small></td>
<td align="middle"><small>ICH2</small></td>
<td align="middle"><small>ICH2</small></td>
</tr>
<tr>
<td><small>Processo produttivo</small></td>
<td align="middle"><small>0.25µm</small></td>
<td align="middle"><small>0.25µm</small></td>
<td align="middle"><small>0.18µm</small></td>
</tr>
<tr>
<td><small>Frequenza di bus</small></td>
<td align="middle"><small>133MHz</small></td>
<td align="middle"><small>400MHz</small></td>
<td align="middle"><small>400MHz</small></td>
</tr>
<tr>
<td><small>Cash Line</small></td>
<td align="middle"><small>32Byte</small></td>
<td align="middle"><small>64Byte</small></td>
<td align="middle"><small>64Byte</small></td>
</tr>
<tr>
<td><small>Internal Data Paths</small></td>
<td align="middle"><small>64bit</small></td>
<td align="middle"><small>256bit</small></td>
<td align="middle"><small>256bit</small></td>
</tr>
<tr>
<td><small>Write cache</small></td>
<td align="middle"><small>No</small></td>
<td align="middle"><small>Yes</small></td>
<td align="middle"><small>Yes</small></td>
</tr>
<tr>
<td><small>In Order Queue(IOQ)depth</small></td>
<td align="middle"><small>4</small></td>
<td align="middle"><small>8</small></td>
<td align="middle"><small>12</small></td>
</tr>
<tr>
<td><small>Open pages</small></td>
<td align="middle"><small>4</small></td>
<td align="middle"><small>8</small></td>
<td align="middle"><small>24</small></td>
</tr>
<tr>
<td><small>Refresh</small></td>
<td align="middle"><small>Flexible</small></td>
<td align="middle"><small>Burst-Only</small></td>
<td align="middle"><small>Flexible</small></td>
</tr>
<tr>
<td><small>Dynamic Bus Inversion(DBI)</small></td>
<td align="middle"><small>No</small></td>
<td align="middle"><small>Yes</small></td>
<td align="middle"><small>Yes</small></td>
</tr>
<tr>
<td><small>ECC</small></td>
<td align="middle"><small>No</small></td>
<td align="middle"><small>Yes</small></td>
<td align="middle"><small>Yes</small></td>
</tr>
<tr>
<td><small>Packaging</small></td>
<td align="middle"><small>544 BGA</small></td>
<td align="middle"><small>615 OLGA</small></td>
<td align="middle"><small>593 FCBGA</small></td>
</tr>
<tr>
<td><small>Staggered balls</small></td>
<td align="middle"><small>No</small></td>
<td align="middle"><small>No</small></td>
<td align="middle"><small>Yes</small></td>
</tr>
<tr>
<td><small>Caps on package</small></td>
<td align="middle"><small>No</small></td>
<td align="middle"><small>No</small></td>
<td align="middle"><small>Yes</small></td>
</tr>
<tr>
<td><small>Memory clock</small></td>
<td align="middle"><small>Common</small></td>
<td align="middle"><small>Source-synch</small></td>
<td align="middle"><small>Source-synch</small></td>
</tr>
<tr>
<td><small>Memory electricals</small></td>
<td align="middle"><small>Impedance comp</small></td>
<td align="middle"><small>Current / temp calibration</small></td>
<td align="middle"><small>Impedance Slew Rate comp</small></td>
</tr>
</table>
</center></div>
<br><br>

Rispetto al chipset i850, il chipset i845 vanta prestazioni velocistiche nettamente inferiori; il gap di questa soluzione è infatti rappresentato dalla memoria SDRAM PC133, che ha una bandwidth complessiva nettamente inferiore a quella della memoria Rambus PC800. On line sono state pubblicate diverse recensioni di questo nuovo chipset, tra le quali sono da segnalare le seguenti:
<br>
- <a href=http://www.aceshardware.com/Spades/read.php?article_id=45000212>Ace's Hardware</a>;
<br>
- <a href=http://www.tech-report.com/reviews/2001q3/p4-sdram/index.x?pg=1>The Tech Report</a>.