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Message: <blockquote data-quote="wrm" data-source="post: 872986" data-attributes="member: 109700">harryb2448 I have the G5 dual core 2 GHz box (M9590LL/A).  It came with two 512 MB DDR2 memory modules (PC2-4200U-444).  Crucial lists faster RAM for this box (PC2-5300), which I thought should work fine.  I assumed the new RAM would run at the 533 MHz set by the slower memory already installed.  I can't tell the speed at which the new RAM is actually running, but System Profiler shows the new RAM as PC2-3200U-288.OWC shows PC2-4200 RAM for this box, which I assume would work fine.  I could return the RAM I bought from Crucial and get the PC2-4200 RAM from OWC, but that's somewhat of an annoyance.  Is there any way that I can find out the speed at which my RAM is actually running?  If not, is there a benchmark I can run from which I can back out an estimate of RAM speed?</blockquote>