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Antec 300 Three Hundred Gaming Midi Tower Case - Black

Stock may vary from item pictured. Retail pictures do not guarantee retail products.

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This item is currently discontinued and at present, we have no replacement on order.
Quickcode: 31087  
Stock code: CSE-MID-AN-300
Cust. Rating:   Read reviews.
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The Essentially Cool and Quiet Case

Impressively spacious and unbeatably reliable, the Antec Three Hundred is an unbeatable enclosure. Despite its eminently portable frame, the Three Hundred has enough room for an NVIDIA 8800 series graphics card, as well as six hard drives and a standardATX motherboard. A cable management compartment keeps your system organized and the airflow unobstructed. A 120mm rear fan and 140mm top fan ensure that the case runs cool even when playing the most demanding games, while the sleek black finish gives it an extra stylish edge.

No Power Supply included

To optimize performance of your Three Hundred, your choice of power supply is crucial. Antec strongly recommends choosing from our NeoPower or TruePower series.


9 Drive Bays

  • External 3 x 5.25"
  • Internal 6 x 3.5" for HDD

Cooling System

  • 1 rear 120 x 25 mm TriCool™ Fan with 3-speed switch control
  • 1 top special 140 x 25 mm TriCool™ Fan with 3-speed switch control
  • 2 front (optional) 120 mm fans to cool the hard drives
  • 1 side (Optional) 120 x 25 mm Fan to cool graphic cards
  • Washable air filters reduces dust build up in your system, which helps keep your system cooler
  • Perforated front bezel for maximum air intake

7 expansion slots

Top mounted I/O ports for easy access

  • 2 x USB 2.0
  • HDA & AC’97 Audio In and Out

Unit dimensions

  • 18" (H) x 18.3" (D) x 8.1" (W)
  • 45.8 (H) x 46.5 (D) x 20.5 cm (W)


  • Net: 15.9lbs / 7.2kg
  • Gross: 18.7lbs / 8.5kg

Warranty Information:

Manufacturer antec
Warranty Type Manufacturer via Aria
Manufacturer Website
Manufacturer Email [email protected]
Warranty Period (yrs)1

Comments, Questions & Reviews:

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 Not bad! Not bad at all!!! by DaveJay

Now.. ok, it gets 4 stars. Should I start with the low points? Well.. its my choice, so yeah. Now.. the PSU I got, the Aria 650W gaming one in black, is a rather good buy at 22 quid (or under) and indeed, I stuck it in along with the mobo (CPU and heatsink attatched of course) and indeed, it was fine. Now, the power pin wires need to be slightly bent into position to make the wires totally straight. So its a bit of a pain in the neck. I did this tho, and after 5 minutes got them connected. Easy. Then I put the HDD in. Easy. Then I got all the case wires connected up to the mobo. Yep, all plain sailing. Then I put the DVD drive in. Ah wait.. problem. The basics are, you have to put the DVD into the 2nd or 3rd DVDey bay down, and the HDD must go into the top slot of the HDDey bay! Then you'll get the SATA cable to go in no probs. But nope.. for airflow I thought hmm.. HDD at second bottom slot and DVD at the very top slot.. if you wanna do this, you'll need to get a SATA cable extension. Oh and I took a while to find out about the power connectors from the PSU to the MOBO.. no instructions on what that little 4-pin CPU 12v was for.. but hey, I found out via Google on my thankfully awesome old PC haha.. so I hooked it to the PSU. Don't blame me, I'm used to building with old Pentiums so I didn't have a clue lol!
(all in all that set me back a wee hour haha, I'd already tidied the cables and thought hm, easy, the DVD drive will just slot in.. haha, thats me educated!)

Anyway all that aside.. it looks great! Indeed it looks HUGE compared to my old Dell Dimension 8400 which TRUST me is a big PC.. this thing will take anything size wise by the look of it and I ain't kidding.. of course double check with the MOBO's because I got a micro ATX, but it'll fit a big GPU in there no probs from what I can see! Loadsa room!

Also, plenty fan slots. Two are already installed, handy, and I'll suggest to buy three 120mm fans on here, very cheap anyway, possibly with LED's if you wanna show off, but you don't need big fancy lights inside, LED fans will do the trick :)

Thanks Aria, my PC build was awesome and I got there in the end.. roll on some HD gaming, woo!

(Specs, A-300 case, AMD PhenomII X4 Black Ed 955 3.2ghz, Gigabyte 880 AM3 with integrated ATi4100 graphics and HDMI, 8mb Mushkin DDR3 RAM 2x4gb)

Just need a new graphics card once I've got it up and running for a while and actually NEED a

343 of 696 people rated this review as helpful

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Question  Motherboard ? by Motherboard fit ?

Hi there, I'm quite new to building custom pc's but I'm in the process of going to build one but can you tell me if this motherboard will fit into this case please >>

Many thanks :)

Answer by andrewn on Saturday, November 13, 2010
The motherboard is a standard ATX form factor, and should fit without any problems.

 A case of excellence. by Paul

Totally brilliant, stylish, and all the room you could want.
PSU sits at the bottom of the case leaving acres of space for your gear up top, probably you could fit more drives in this than NASA owns.
I've got 5 case fans and a huge CPU cooler in mine and it's cooler inside than a snowmans cold bits on a frosty day.
It's well built enough to last a life time, it'll definitely outlive me.
Spend the money and get one, you'll be as pleased as Punch. Although I don't know exactly how pleased Punch was, but it seems as though he was very pleased about something or the other, probably wasn't a computer case I guess. Who knows? not me.

465 of 925 people rated this review as helpful

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 A very good budget case by DK63

I originally had an Antec 900 case but it proved to be too big to take to lans, so I built a gaming rig into an Antec 300. It is a fair size, easily taking any ATX motherboard. The 2 supplied case fans in mine are plain black, which I was quite happy with. There are 3 speeds, but I run mine on the low setting. I also installed 2x120mm Sharkoon Silent Eagle 1000 fans in the front, which light up blue, and compliments the case nicely. The upper one blows air directly onto the gfx card, a GFX285, and the lower one cools the hard drive. This case offers some serious air cooling potential if the fans are set to high speed! Also, my gfx card is 27cm, and just fits. If your card is longer, this is not the case for you, unless you plan on some modding. I use an Arctic Freezer Pro Rev2 cpu cooler, and still have plenty of space between it and the side panel. The psu sits at the bottom, so I had to mount it "upside down" so the intake fan was on top to draw out air from above.
The only minor problem I've come across, and it's only happened twice, is the power button is only a couple of inches above the optical drive button, if you use the top bay like me, and I pressed the power button by mistake when I wasn't paying attention. The reset button is very difficult to press accidently, as it's recessed.
All in all, I'm very happy with this case. So much so, I plan on buying a second one and have it powder coated so it looks better going to lans. Only problem is, I can't decide what colour!!

415 of 840 people rated this review as helpful

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 Easy build-super value by oshimaida

After my recent build using a CM scout and trying to hide spare cable on the rear of the motherboard tray and then trying to get the side panel on easily!! -this was a breath of fresh air to build in, full atx board -8800gts etc all went into it with no cuts and nicks of my hands.
Most of the cables were hidden any way ,I found the little compartment for spare cable most useful,all in all it was a nice build and for £40 or so I would recommend it.
For info- put 2x 120cm yate loons in the front and when I first powered it up my wife commented how quiet it was,I then told her there was 10 fans altogether running in this rig-nuff said !!

502 of 968 people rated this review as helpful

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