[Build help] Some parts purchased + potentially silly questions

Here's a build I just put together

PCPartPicker part list / Price breakdown by merchant

Type Item Price
CPU Intel Pentium G3258 3.2GHz Dual-Core Processor £48.93 @ Amazon UK
CPU Cooler Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler £24.97 @ Amazon UK
Motherboard MSI H81M-P33 Micro ATX LGA1150 Motherboard £31.98 @ Ebuyer
Memory Corsair 8GB (2 x 4GB) DDR3-1333 Memory £44.24 @ Ebuyer
Storage Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive £39.97 @ CCL Computers
Video Card MSI Radeon R9 280 3GB TWIN FROZR Video Card £159.98 @ CCL Computers
Case NZXT Source 210 (White) ATX Mid Tower Case £29.99 @ Novatech
Power Supply Corsair Builder 500W 80+ Bronze Certified ATX Power Supply £46.86 @ Aria PC
Operating System Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) £67.95 @ Ebuyer
Prices include shipping, taxes, rebates, and discounts
Total £494.87
Generated by PCPartPicker 2015-05-25 13:01 BST+0100

And the CPU I put in there is overclockable and due to the CPU a G3258 most lga 1150 motherboards will overclock it.

/r/buildapc Thread