Roadmap delle memorie DDR

[Redazione di Hardware Upg]

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Nella tabella sottostante è riportata la roadmap delle memorie DDR, attualmente utilizzate sui sistemi Socket A e presto anche su schede madri per processori Pentium IV.
<br><br>
<div align="center"><center>

<table border="1" cellspacing="0">
<tr bgColor="lightblue">
<th bgColor="#004080" rowSpan="2"><p align="center"><font color="#ffffff" face="Arial"><small>Type
</small></font></th>
<th bgColor="#004080" rowSpan="2"><p align="center"><font color="#ffffff" face="Arial"><small>Moduli</small></font></th>
<th bgColor="#004080" colSpan="2"><p align="center"><font color="#ffffff" face="Arial"><small>Clock
</small></font></th>
<th bgColor="#004080" rowSpan="2"><p align="center"><font color="#ffffff" face="Arial"><small>Frequenza
di lavoro</small><br>
<small>effettiva (MHz) </small></font></th>
<th align="middle" bgColor="#004080" colSpan="2" rowSpan="2"><p align="center"><font
color="#ffffff" face="Arial"><small>Bandwidth (GB/s) </small></font></th>
</tr>
<tr align="middle">
<td align="middle" bgColor="#004080"><p align="center"><font color="#ffffff" face="Arial"><small>Ns
</small></font></td>
<td align="middle" bgColor="#004080"><p align="center"><font color="#ffffff" face="Arial"><small>MHz
</small></font></td>
</tr>
<tr align="middle">
<th rowSpan="3"><p align="center"><font face="Arial"><small>DDR1 </small></font></th>
<td><p align="center"><font face="Arial"><small>PC1600 / DDR200 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>100 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>100.0 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>200.0 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>1.6 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>1.5 </small></font></td>
</tr>
<tr align="middle">
<td><p align="center"><font face="Arial"><small>PC2100 /DDR266 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>75 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>133.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>266.7 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>2.1 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>2.0 </small></font></td>
</tr>
<tr align="middle">
<td><p align="center"><font face="Arial"><small>DDR333 / PC2700</small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>60 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>166.7 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>333.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>2.7 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>2.5 </small></font></td>
</tr>
<tr align="middle">
<th rowSpan="3"><p align="center"><font face="Arial"><small>DDR2 </small></font></th>
<td><p align="center"><font face="Arial"><small>DDR400 / PC3200</small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>50 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>200.0 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>400.0 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>3.2 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>3.0 </small></font></td>
</tr>
<tr align="middle">
<td><p align="center"><font face="Arial"><small>DDR533 / PC4300</small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>37.5 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>266.7 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>533.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>4.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>4.0 </small></font></td>
</tr>
<tr align="middle">
<td><p align="center"><font face="Arial"><small>DDR667 / PC5400</small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>30 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>333.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>666.7 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>5.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>5.0 </small></font></td>
</tr>
<tr align="middle">
<th rowSpan="3"><p align="center"><font face="Arial"><small>QDR </small></font></th>
<td><p align="center"><font face="Arial"><small>- </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>100 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>100.0 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>400.0 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>3.2 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>3.0 </small></font></td>
</tr>
<tr align="middle">
<td><p align="center"><font face="Arial"><small>- </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>75 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>133.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>533.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>4.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>4.0 </small></font></td>
</tr>
<tr align="middle">
<td><p align="center"><font face="Arial"><small>- </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>60 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>166.7 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>666.7 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>5.3 </small></font></td>
<td align="middle"><p align="center"><font face="Arial"><small>5.0 </small></font></td>
</tr>
</table>
</center></div>
<br><br>
Come si nota chiaramente, le frequenze di lavoro dei moduli memoria DDR sono destinate ad aumentare sensibilmente e con esse anche le bandwidth massime. Il picco massimo verrà raggiunto con i moduli DDR667, operanti a 333 Mhz di clock e con bandwidth massima complessiva di ben 5.4 Gbytes al secondo.
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Fonte: <a href=http://www.vr-zone.com/>VR-Zone.com</a>

[Dreadnought]

Qua bisogna dividere per 10 i nanosecondi, che per giunta si scrivono ns, non Ns.