If you are using 2 ram slots and your motherboard supports 4, then you are required to use slot 1 and 2 (refer to your motherboard manual for which one 1 and 2 is; ex. 1 and 2 could be slots 1 and 3 on the motherboard, it does not necessarily mean that 1 and 2 is 1 and 2 on the motherboard). If this is not followed then the RAM wont show up in your system. That said if you want a colder computer my recommendations would be as the following:
For the rear exhaust fan
120 mm fan:
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
CPU Cooler: Corsair H80i 77.0 CFM Liquid CPU Cooler ($86.99 @ Amazon)
Total: $86.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-29 15:41 EDT-0400)
140 mm Rear Exhaust fan:
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
CPU Cooler: NZXT Kraken X40 98.3 CFM Liquid CPU Cooler ($99.99 @ Newegg)
Total: $99.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-29 15:43 EDT-0400)
These two solutions all though they might be a little more expensive will keep your computer really nice and cold, as well as be a lot better fit for your motherboard and ram problem. I hope this helps some, and also please remember to select a best solution so that others may learn from this thread. Thank you for your time and have a good day.