With Dual Channel it doesn't matter besides having 2paired ram in the correct slots, 1-3 or 2-4 it doesn't matter, but there is an issue with your ram itself, (I'm not the most tech Savvy person so i may not be 100% correct on this, but from what i have read over the years this is my understanding).
but the issues here are that
1: having 4 sticks of ram in 2 different Dual channel slot, won't improve the performance, if anything hinder it, you can still run all the ram slots in unganged mode and take advantage of the bulk amount of ram, only time 4 sticks or ram work great like that is when the motherboard supports quad channel ram (the board will have 8 ram slots) and its best to get a quad channel kit for them
2: cause your 800Mhz ram is 2 different brands their timings may be not correct to each other, so again best to run in unganged mode
and finally 3: cause you have 667Mhz ram installed it will bottleneck the 800Mhz ram down to 667. i tried and tested this years ago, with my AthlonX64, the slower ram bottle necked my cpu!
to see how your computer is performing i would recommend 1 program, CPU-ID (i get the ROG version, it looks fat) http://www.cpuid.com/downloads/cpu-z/1.68-rog-setup-en.exe
click the download now, then you can see how whats reading and even validate it and post it on forums eg: my 6 year old beast http://valid.canardpc.com/7nyrxi
as for your issue with Chrome, i am unsure about that one, not a very software savvy person!
Well i hope you find my answer helpful, and if anyone else reads this, please inform me if i am incorrect on things, i can take it!