So I have been facing a dilemma and was hoping for some expert opinion/advice as I am baffled by this problem..
I loaded my cMP 2008 with 64GB 667MHz 8x8GB Crucial memory (server-grade) and noticed an impact/penalty of 50% on my SSDs transfer speeds, however, with 48GB loaded the results are as expected and the SSDs are performing at the maximum achievable speeds on a Sonnet Tempo Pro pcie card.
All 8 ram modules have been stress tested and verified including the brand new memory risers - no errors whatsoever. So what could be causing this?
Thanks!
I loaded my cMP 2008 with 64GB 667MHz 8x8GB Crucial memory (server-grade) and noticed an impact/penalty of 50% on my SSDs transfer speeds, however, with 48GB loaded the results are as expected and the SSDs are performing at the maximum achievable speeds on a Sonnet Tempo Pro pcie card.
All 8 ram modules have been stress tested and verified including the brand new memory risers - no errors whatsoever. So what could be causing this?
![64GB-MACPRO-2008-SLOWDISK.png 64GB-MACPRO-2008-SLOWDISK.png](https://forums.macrumors.com/data/attachments/516/516914-fb6065d60481e8385761e9d310e46549.jpg)
![48GB-MACPRO-2008-FASTDISK.png 48GB-MACPRO-2008-FASTDISK.png](https://forums.macrumors.com/data/attachments/516/516915-f1a7209ea6c6fd57f0d414b333bf0597.jpg)
Thanks!