What is the brand and model number of your motherboard? Does your motherboard support modern 3rd generation SATA 3 6Gb/s solid state drives? The reason I'm asking is that you mentioned an Intel® SSD X25-M Series ssd which suggests you might have an older motherboard.
The motherboard that I'm using now is gigabyte p55a-ud6 with i7 860.The next week i will upgrade my Pc and I will move to a 4670k + GA-Z87X-UD4H.I know that is not so much of big jump upgrade because 860 was overclocked to 3.6 but i wanted to go with the new platform.P55 was not so good as a chip z87 is and i will have and the chance to upgrade even further, besides 4670k will be also oveclocked. My only concern is know that you mention it is if SATA 6Gb/s connectors working backwards for the Intel® SSD X25-M Series ssd because is SATA 3Gb/s...I guess it does right?
My pc now is:cpu:i7 firstname.lastname@example.org
cpu fan:coolermaster v8
ram:8gb corsair vengeance 1600
gpu:gigabyte 660 oc edition
case:coolermaster cm 690II
psu:coolermaster 850 silent pro
ssd:intel postville x-25m 80 gb for OS
hhd:2 caviar black 640 sata II on raid 0
sound:soundblaster x-fi titanium fatality
I will change only the parts that i mention before cpu+mobo i guess it will be ok.
The same thing is with the 2 caviar black 640 sata II disks that i have guess will be ok.