You'll only see the TCB0 or TCB3 on Samsung chips on the RAM. It's pretty clear at the end of a grouping of letters and numbers on the actual RAM chip. The -6 should be in the same place as the TCB, but on the Infineon RAM. Most of the RAM has a -7 or -7.5 marking meaning that it's a 7 or 7.5ns RAM instead of the 6ns RAM of the -6 marking.All of my chips say "Infineon" on them. Is that good or bad? Also, where does it say "TCB". I can't find that on the chips or the packaging, but it does say -6 on the chips.
Hope this helps.. Just remember that the -6 marking is on the actual RAM chip and this is the Infineon marking you're looking for. The "TCB" marking is on the Samsung chips.
BTW.. Best Buy does not price match online prices of any kind, so if it's not in a local flyer ad or not on sale at a CUSA B&M, you're SOL. The best you can do is buy the RAM at CC or CUSA and then buy the RAM at full price at BB. Then, do the ole' switcheroo when you return your RAM to BB with the full price receipt.
Sal