What is the correct RAM for a 2010 MacBook Pro? I bought a 2.4GHz mid 2010 MacBook Pro logicboard on eBay. Upon installing RAM, the computer beeps every five seconds indicating it doesn't detect RAM. I used standard 8500s 1066MHZ RAM with 8 modules on each side of the chip (2Rx4?). The seller claims the board will only work with RAM that has 4 modules on each side of the chip (1Rx4?). I guess the terminology here would be 1Rx4?

The RAM is good because both chips worked in an A1342 MacBook.

I understand Macs are particularly sensitive to RAM clock speeds and such but I'm concerned I bought a bad board. Any ideas? Thanks.
According to the free app MacTracker, a mid-2010 Macbook Pro has:  Memory Slots 2 - 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM. And has a maximum memory of 8 Gigs. I've read that Macs are sensitive to memory chips too. So I'd make sure the numbers above were followed. I upgraded my iMac with chips from Crucial. Works fine.