Graphics GTX 670 Compatibility?

Hey all, in my PC, I have two MSI Power Edition GTX670's. I was curious if getting a 4GB 670 would be incompatible in SLI with the other 2 2GB cards? (yes, I do know that my current mobo only supports two GFX cards) I know that you are supposed to be able to pair any 670 with any other, but I was wondering if the different quantities of memory would cause an issue.

 

It will work but The 4gb card will only use 2gb of its ram when you run it in sli.

 

Thanks, also, If I had two 4GB cards, would they both use all 4 GB then?

 

yep they will run the same or one will lover its self to match the other eg 2gb card 4gb card run at 2gb

4gb and 4gb all good

 

Yep, SLI cards will also run at the lowest clock speed and smallest memory that one of the cards has.