smolz Posted January 18, 2010 Share Posted January 18, 2010 I have a gigabyte EP45-UD3P board that I have been running Snow Leopard on for a while now. I had only a pair of 1gig sticks of ram in the machine. I figured I would up the performance of the machine and get 4 x 4GB sticks of ram to fill it up. The machine will not finish loading with all 4 sticks of ram in the machine, it will get to the loading page with an Apple and a spinning loading icon. If I put in only 1 pair everything loads fine, I have tried it with either set of 4 GB and the pair of 1GB sticks and it will not load. It seems that it will not load with 4 sticks of RAM in it????? Link to comment Share on other sites More sharing options...
Z0ID Posted January 18, 2010 Share Posted January 18, 2010 Hey, smolz Is your SL in 32 or 64 bit mode ?, 32bit doesnt support Ram size over 3,5 gb (due to the length of 32bit storage registers Float/Integer 2^32 addresses) In 64bit mode your machine theoretical adresses 16.3 million terabytes or 16 exabytes of RAM :-), So check out the boot flag "arch=x86_64" And cross fingers that all your drivers are 64bit capable...maybe you have to find 64bit versions of them... good luck betzo Link to comment Share on other sites More sharing options...
smolz Posted January 18, 2010 Author Share Posted January 18, 2010 Hey, smolz Is your SL in 32 or 64 bit mode ?, 32bit doesnt support Ram size over 3,5 gb (due to the length of 32bit storage registers Float/Integer 2^32 addresses) In 64bit mode your machine theoretical adresses 16.3 million terabytes or 16 exabytes of RAM :-), So check out the boot flag "arch=x86_64" And cross fingers that all your drivers are 64bit capable...maybe you have to find 64bit versions of them... good luck betzo YOU ARE MY FRIGGIN HERO!!!!!! That fixed everything, the only thing that I had to install was the updated Drobo dashboard that runs in 64 bit mode. Once again thanks!!! Link to comment Share on other sites More sharing options...
AppleIIGuy Posted January 19, 2010 Share Posted January 19, 2010 YOU ARE MY FRIGGIN HERO!!!!!! That fixed everything, the only thing that I had to install was the updated Drobo dashboard that runs in 64 bit mode. Once again thanks!!! 32 bit / 64 bit doesn't matter. Intel Mac OSX supports PAE Intel Mac OS 10.4.4 and onwards can currently support 32 GiB of RAM, even though the Mac OS X 10.5 Leopard kernel remains 32-bit. The Mac OS X 10.6 Snow Leopard kernel can optionally run in 64-bit on certain systems. Link to comment Share on other sites More sharing options...
Z0ID Posted February 7, 2010 Share Posted February 7, 2010 32 bit / 64 bit doesn't matter. Intel Mac OSX supports PAE Intel Mac OS 10.4.4 and onwards can currently support 32 GiB of RAM, even though the Mac OS X 10.5 Leopard kernel remains 32-bit. The Mac OS X 10.6 Snow Leopard kernel can optionally run in 64-bit on certain systems. I agree , but PAE has to be implemented before compiling the Kernel, most Kernel modules are not build with PAE support... Link to comment Share on other sites More sharing options...
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