I dont believe there is sufficient performance difference between 'cheaper' and 'more expensive SSD' to make any difference- 3 years ago there was - these days I havent seen anything in any 3rd party performance testing to indicate it would make a difference-
Run test G with different drives and email me-
I cant imagine any PCI raid controller being at all useful with SSD -
these things are designed to deal with things that simply do not occur with SSD- There are no access times with SSD
PCI raid controllers are designed to deal with access time latencies
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I count drop frames in all my proper testing my performance graphs count drop frame - my testing HUD counts drop frames- i suggest you take a look at performance G - i have done very long term testing-
And run it to see where you are getting dropped frames-
There are a number of Operating system things ( the OS can go away and do something for a while - some house keeping ) - this is minimised by turning off everything you can like spotlight - on all discs
synchronisation things- VGA/DVI display rates not being the same as broadcast -
And performance things - with slower discs- performance is usually the lowest factor these days