Mixing RAM chips

My Mac Pro, early 2009 came with 6x 1 Gb memory. I ordered 2x4 Gb and cannot find a combination that allows me to mix the 2 sizes of chips. I did find the error in the manual that stated 2 chip configurations should use 1 and 2 instead of the correct 1 and 5. Any combo of 4 Gb and 1 Gb chips leaves me with a blinking power light and no boot up.
Am I missing the magic combination? For now I'm running 2x4 Gb and contemplating adding a 3rd 4Gb and leave the 1 Gb chips in the drawer.
TIA, Glen

Thanks for the responses,
the chips came from Memory America and their support folks have now stated that 4 Gb chips cannot be mixed with other size chips, same as posted here for OWC. This is a new development in Mac memory that should be a more public. I've now got 6x 1Gb sticks to use for fishing lures and need to buy another 4 Gb stick to achieve a significant RAM increase.
this Mac Pro will be used for 3D rendering of microscopy images, which ***** up a lot of RAM.
Regards, Glen

Similar Messages

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    Quote from: jimmi1 on 06-June-08, 18:27:11
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