Look at the CFM of all fans, to make sure your getting more air out than in...so a NEGATIVE pressure.
The Antec 300 is a great budget case, no woes... give us more info...on the CPU fan type (might be seated wrong, might need better thermal compound or aftermarket cooler!!!) and GFX card model...
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i5 2500K @ 4.5GHz / NH-U12P / P8P67 DELUXE / 8GB Corsair Vengeance Arctic White 1.35V 1600 / 2 x N560GTX Ti Twin FROZR II OC in SLI (8823 3Dmarks11 P-score)/ Corsair Performance Pro 128GB SSD
ROG G53SX laptop: i7 2630QM / 12GB DDR3 / GTX560m 2GB / 750GB 7200rpm (14 000 3Dmarks06)
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