3x2gb or 4gb+2gb ram ?

[mobor]

i have intel dh55tc mobo and win 7 64 bit.
Earlier I had 2x2gb ram (same model, dual channel) but now one of the ram stick got faulty and am left with just 2gb ram. i can't find the same ram model to replace the faulty one and also i'm thinking of upgrading to 6gb ram. so should i go for 2gb(old)+2x2gb (new)ram configuration or a 2gb(old)+1x4gb(new)?

 

[jaquith]

Most RAM caries a Lifetime Warranty so I'd get the bad stick replaced and if needed get a matching set to the 2x2GB that you already have and you'll have 8GB otherwise get a 2x4GB set and use the 2GB as a paperweight.

 

[FunSurfer]

+1 to Jaquith
To OP - you will lose Dual Channel mode if you put 2gb(old)+2x2gb (new), or 2gb(old)+1x4gb(new).