T61 memory upgrade?

[Olwe]

I'd like to add memory to my T61. It's got 2x2gb now. I'd like to go up to 6gb (2gb + 4gb). I've heard the wives tales about "mixing" memory sizes. Will T61 behave with "mixed" mem sizes?

[Cigarguy]

Here's the memory combo that I've done in my T61(s). Each configuration works fine.

2x1GB, 1x2GB, 2x2GB, 1x1GB + 1x4GB (5 GB), 1x2GB + 1x4GB (6 GB), and currently 2x4GB. For my usage I can easily do with 2 GB but 8 is there if ever I get inspired and my desktops are not available.

[RealBlackStuff]

You will also need a 64-bit OS to be able to use more than 4GB.

[DaKKS]

You will also need a 64-bit OS to be able to use more than 4GB.

3.25GB actually. The full amount of ram is reported however.

[twistero]

Currently I have 2GB + 4GB in my T61. It runs perfectly fine, and in fact CPU-Z reports that the memory is running in "dual" channel mode.

[Olwe]

I've been an ebay shopper for memory. Does anybody know a better source?

[Bánh mì]

You want to use branded memory such as Crucial or Kingston IMO not some generic memory from eBay. The price may seem favorable but I wouldn't trust it and there is probably no warranty.

[basketb]

I've been an ebay shopper for memory. Does anybody know a better source?

Personally, I only have bought/will buy brand name memory from any of these retail outlets:
amazon.com
newegg.com
crucial.com
fry's
Best Buy

[twistero]

I've always bought used memory from eBay, but I only consider those listings of brand-name memory with actual photos and detailed descriptions of part numbers, etc. Haven't run into defective memory so far.

[cadillacmike68]

I've never had a problem buying used kingston memory for my thinkpads - From T61 thru T21/22.

[pointyhat]

I always buy same size pairs from crucial.com - quick delivery and always works flawlessly.