Difference between white and black memory slots?

2 of them r white and 2 of them are black wondering if i should plug my 2 sticks of ram into the white sockets, the black ones, or mix them

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black horse slot machine Industry White Papers · Forums · Latest · Hardware Design · Embedded The two black slots are not being used Attachments

black diamond slot machine I'm trying to upgrade the memory on my PC After opening up the tower, I found 2 memory slots, and one has black locks around it