RAM Questions.

Hi guys,

For my sins I have always been a BTO buyer, recently making the transition to Apple from years of Dell Precision use. Sadly, gone are the days where I could customise my windows box and charge it to my employers tab! Basically... I need to understand how best to upgrade my new mac pro as before I could just select all the components with the highest numbers, bung them in and hope for the best.

Basically, I work in Audio, and certain applications are very RAM intensive, and I am looking to upgrade from my stock 2 GIG.

I have tried reading the guides, and they make 'some' sense, which is quite surprising as admittedly, I am not the most knowledgeable when it comes to computing.

I am thinking of purchasing the 8 GIG kit, thus making 10 GIG available, but after browsing threads, unless I have misunderstood... I believe this hinders performance?

Would it be best if I bought:
2 x 1 GIG so I have two matched pairs making 4 GIG in total and put them in Riser 2, and then another 4 x 2 GIG to make 8 GIG and put them in Riser 1?
Making 12 GIG Total?

Or would the 10 GIG suffice as the performance drop is negligable?

Could someone clear this up for me, do the DIMMS have to be matched across both risers for optimal performance? I.E. Use 1 GIG sticks only, or 2 GIG sticks only? Or can I use different size RAM sticks in different risers, I.E 1 GIG sticks in riser 2 and 2 GIG sticks in riser 1?

How do I optimise performance?

PPS. If there are any grammarpolice about, I apologise for my bad English, it is not my native tongue!

Thanks