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The case is described by Antec as spacious, cool running and easy to work with, and i couldn't agree more.
The case supports a full ATX motherboard, with the power supply fitted at the bottom. It has space for 6 hard drives, and 3 full sized disk or other drives. The cable management is very good and there are reusable cable ties is places around the case to help.
One thing that impressed me while building my PC was how well thought through the case was. There are 2 fans mounted at the front for example, these are mounted from the inside on doors to keep everything neat, and these doors can easily be removed from their hinges to screw in the fans on a desk. There are then generously sized holes for the fans cables to go through into the cable management space. In front of these fans is a removable air filter.
Things like this are apparent throughout the case, and it is built to be extremely easy to build and work with. As well as being good in the build stage, this case is very very well ventilated, it is provided with 1 120mm fans, and 1 140mm, and then has the option for a further 3 120mm fans on the front and side. Personally i advise putting LED fans in the front of the case, as it looks very nice but not cheesy.
I couldnt recommend this case any more strongly, it has more than enough room for everything, is extremely well through through and is excellent at high performance. On top of all that, it only costs £40, and looks really professional.
I purchased the computer case when I was upgrading my PC. I needed something that wasn't too big, wasn't too hard to build a PC in and that was affordable. When I was buying, it was very hard to find therefore I paid £40, now they can be had for around £35.
The case itself is a very basic cuboid shape with no fancy patterns. It does not have a window which you may want but I do not really mind. The case is black and sleek. The actual case is made from Aluminium, but the front piece is plastic. If you flex it is feels a bit flimsy but with normal use it should be fine.
The cooling capabilities are good and even better if you add some more fans. The case has 5 fan mounts. There are two 120mm on the front, one 120mm on the side, one 120mm on the back and a 140mm on the roof. Antec supplies both the top 140mm fan and the rear 120mm fan. The power supply is situated at the bottom of the case so these fans are sucking the warm air right off your motherboard. The top fan does have a tendency to vibrate against the thin roof panel but this can be fixed with a packet of £1 silicon fan screws. For such a cheap case it offers high end cooling potential.
The layout of the case is fairly standard other than that the PSU is located at the bottom. This is good as it lets Antec have a large fan on the top of the case but it may be a problem if your PSU has short cables. I had to stretch my CPU power connector over the motherboard; it is messy and possibly restricts airflow. The drive bays are orientated so there is clean passage for air to flow over the hard disks and into the case from the front fan mounts. There are only three 5.25 inch drive bays, but you are unlikely to need that many in a budget case. The drive bays lack and vibrations dampening or easy install gubbins which can be a bit of a problem if you have a loud drive like me.
Overall the Antec Three Hundred is a great case for only £40. It has great cooling and is reasonably quiet with its stock cooling. It may not have the flashy looks of some gaming cases but lights are not for everyone. For £35 at today's prices it is a great cheap computer case.