W500 RAM upgrade problem

[Marto181]

So Just buy two new ram blocks Corsair Mac memory 4gb 1066mhz.
When install both of them erorrs start to apear (binary modules which failed authentication are trsf) and after few restarts laptop stay on black screen.

Now I install one of the new Block and one of the old ones which is Elpida 2gb 2Rx8 pc3-8500S.
And computer now run smoothly and Just passed memory check without problems.
Please help install both Blocks now run on 6gb one new and one old

[jldr_2]

Corsair Mac memory is 1 rank 1rx8 and the T/W500 series Thinkpads use 2 rank 2rx8 DIMMs. You can still pick these up fairly easily new or used, just make sure they're 2rx8 DIMMS