hi~everyone, I just upgrade the ram to 5G, but something Strange。 first:when I upgrade to 5G and boot the mac, and the login window is different with 2G, the Circular user's photo is gone!! so Strange! and I swap to 2G, the photo is back... second:I have test with the Geekbench, and the result is 2G higher than 5G??? the "Memory performance" is Significant difference。 in the picture,left is 5G and right is 2G, why so different? Is it the ram's brand problem?