1) If I need to add storage space, can my current power supply handle another internal HDD? I've already added the GPU so I'm concerned about adding anything else. (the stock power supply is 300 watt)
2) What type of internal HDD would I need? I see a couple of types of SATA drives... how do I know which I'd need?
3) Is there anything I need to know about installing an internal HDD? Or do I just plug it in and boot up?
Honestly, you will not see any performance hit if you go with 1.5GB/s vs 3GB/s. Hard drives are not able to transfer data at either of those speeds, so it doesn't matter.
If you find one that you like at an affordable price, post a link to it here and we should be able to tell you if it's a reliable brand that will work with your computer.
Yes. Most sata 3gb/s hard drives come with a jumper on them to force them to operate at 1.5gb/s speeds. Unless you remove this jumper, you won't have any problems connecting one to your motherboard.
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