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Ram Upgrade issue

I am having trouble installing more ram into my Dell OptiPlex 790 .

When I put them in and when I boot up I get a single beep then 3 beeps the one ( ram error ) The pc wont boot with the new ram. Its a Dell OptiPlex 790 the existing ram is PC3-10600u-9-10-133 currently with 2 x 2gb  -  The Ram I have purchased is DDR3 1066 MHZ PC8500 Kingston server ram

The specs say it will allow up to 16gb ( 4 x 4 )  Have I got the wrongg ram ?

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