<div class="gmail_quote">On Sun, Apr 12, 2009 at 10:43 PM, Jason Clinton <span dir="ltr"><<a href="mailto:jclinton@advancedclustering.com">jclinton@advancedclustering.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="gmail_quote"><div>No, it does not degrade performance as long as the CAS latencies of both DIMM types are identical and you would not get a clock-down by using that quantity of RAM ranks. We have been able to attain Intel's reported, magical 35GB/s number using ICC. GCC 4.3 is around 31GB/s. (At 1333MHz.)</div>
</div></blockquote><div><br>I should qualify those numbers a little: when using any quantity of RAM exceeding 1 DIMM per channel, they clock down to 1066MHz, and benchmark at 33 GB/s w/ ICC and 29 GB/s with GCC 4.3. It doesn't matter if they are different sizes or not. The 35GB/s number is for single-populated memory configurations.<br>
</div></div>-- <br> Jason D. Clinton, 913-643-0306<br>