http/www.flipkart.com/corsair-ddr3-4-gb-laptop-ram-cmso4gx3m1a1333c9/p/itmdfyqygud2uh6m?pid=RAMD2RYPJHCFQJBC&srno=b_25&ref=de50b327-0dbe-40e4-83ca-1f7a09237cf2
http/www.flipkart.com/corsair-ddr3-4-gb-laptop-ram-cmso4gx3m1b1333c9-cmso4gx3m1a1333c9/p/itmdfyqygud2uh6m?pid=RAMDFYPZMHUYJ9ZJ&srno=b_23&ref=de50b327-0dbe-40e4-83ca-1f7a09237cf2
I can see one has 'A' in its number and the other has 'B' ..
http/www.flipkart.com/corsair-ddr3-4-gb-laptop-ram-cmso4gx3m1b1333c9-cmso4gx3m1a1333c9/p/itmdfyqygud2uh6m?pid=RAMDFYPZMHUYJ9ZJ&srno=b_23&ref=de50b327-0dbe-40e4-83ca-1f7a09237cf2
I can see one has 'A' in its number and the other has 'B' ..