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Optiplex 780 MT Ram Upgrade

I have a Optiplex 780 MT system and I has 4gb 1066mhz dual channel samsung memory.

I want to replace it with 2x 4gb 1333mhz dual channel memory kits, and I'm choosing between Zeppelin, Corsair, Patriot, and even HyperX.

My question is: will it work or do I need 1066mhz memory.

I know that there are a lot of posts on this forum with this topic, but none of them have a definitive answer.

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RE: Optiplex 780 MT Ram Upgrade

4 memory slots =
White DIMM 1 (Channel A)
Black DIMM 3 (Channel B)
White DIMM 2 (Channel A)
Black DIMM 4 (Channel B)

Maximum = 16GB (4x4GB)

DDR3 = Non-ECC 1066MHz or Non-ECC 1333MHz (mixing will result in slower speed)

Unknown about 3rd party memeory. Dell OEM memory =
HKYF9 4GB, 1333MHz, 512X64, 8, 240pin, 2RX8
9V62Y 4GB, 1333MHz, 512X64, 8, 240pin, 2RX8
P382H 4GB, 1333MHz, 512X64, 8, 240pin, 2RX8
60KD4 4GB, 1333MHz, 512X64, 8, 240pin, 2RX8
N852H 4GB, 1066MHz, 512X64, 8, 240pin, 2RX8

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