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Cooler Master MasterBox Q300L Micro-ATX Tower w/ Magnetic Design Dust Filter Expired

$38.70
$48.99
after $10 Rebate + Free S&H
+77 Deal Score
72,884 Views
Amazon.com has Cooler Master MasterBox Q300L Micro-ATX Tower w/ Magnetic Design Dust Filter for $48.66 - $10 Rebate = $38.66. Shipping is free. Thanks bitinabyte

Editor's Notes & Price Research

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Original Post

Written by
Edited September 12, 2020 at 10:09 AM by
A decent case for budget builds. Has a $10 rebate and there's an additional $0.30 discount.

Total: 48.99 - 10 - 0.30 + tax

https://smile.amazon.com/gp/produ...UTF8&psc=1 >Coupon is NLA. Price is now $38.66 AR.
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Deal
Score
+77
72,884 Views
$38.70
$48.99
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Just used this case in a build for a friend this past Friday. Good deal for <$40

Some notes:
- It starts off on the right foot with stylized magnetic mesh (i.e. dust filters) on the front and top of the case, but like you'd expect in this price point ($50 at Microcenter): there's no pre-installed intake fan. There is one pre-installed 120mm exhaust fan.
- The windowed side panel feels like flimsy plexi-glass (i.e. plastic), but the panel has a neat "premium" feature that allows you to relocate the USB/audio/power button panel from the front to the top, bottom, or rear of the side panel.
- There's plentiful cable management channels along the tray, but none of them have rubber grommets. While it does have anchor points for zip-ties, there are only 3 of them and all are along the channels. Could really use at least one directly behind the motherboard tray to tie-down the 4/8-pin CPU aux power as well as top/rear fan cables.
- Speaking of the rear motherboard tray area, there's ample space to mount a 2.5" storage drive or even a full 3.5" harddisk drive.
- The 4 expansion bays are all the extremely cheap push-out design. Have to be really careful when removing these as you can bend the remaining thin steel frame.
- The PSU requires a bracket which serves no apparent purpose but to complicate the installation and potentially block your AC power cable. We used a Seasonic Focus Gold 650W semi-modular power supply, which cleared the bracket, but not without rubbing.
- There are no clear indicators for mounting front/top fans, just hundreds of stamped out holes, and a few counter sunk screw holes for radiators. This means if you're mounting front/top fans, you'll have to slide the fan around a bit until you find 4 holes that line up.

Overall it's a solid case, but there's definitely more penny pinching going on than not. If they charged a few dollars more for rubber grommets and removable expansion slot covers then it would easily squash my more severe critiques.
I have this case for my LAN party rig, love it. I fit 5 140 mm fans and 1 120mm on it, great airflow. I have a 3600, with a 5600 XT and 2 SSD's all mounted in it:

https://i.imgur.com/FfQdONM.jpg

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Joined May 2013
L4: Apprentice
> bubble2 323 Posts
129 Reputation
spartanvi
09-09-2020 at 07:22 PM.

Our community has rated this post as helpful. If you agree, why not thank spartanvi

09-09-2020 at 07:22 PM.
Just used this case in a build for a friend this past Friday. Good deal for <$40

Some notes:
- It starts off on the right foot with stylized magnetic mesh (i.e. dust filters) on the front and top of the case, but like you'd expect in this price point ($50 at Microcenter): there's no pre-installed intake fan. There is one pre-installed 120mm exhaust fan.
- The windowed side panel feels like flimsy plexi-glass (i.e. plastic), but the panel has a neat "premium" feature that allows you to relocate the USB/audio/power button panel from the front to the top, bottom, or rear of the side panel.
- There's plentiful cable management channels along the tray, but none of them have rubber grommets. While it does have anchor points for zip-ties, there are only 3 of them and all are along the channels. Could really use at least one directly behind the motherboard tray to tie-down the 4/8-pin CPU aux power as well as top/rear fan cables.
- Speaking of the rear motherboard tray area, there's ample space to mount a 2.5" storage drive or even a full 3.5" harddisk drive.
- The 4 expansion bays are all the extremely cheap push-out design. Have to be really careful when removing these as you can bend the remaining thin steel frame.
- The PSU requires a bracket which serves no apparent purpose but to complicate the installation and potentially block your AC power cable. We used a Seasonic Focus Gold 650W semi-modular power supply, which cleared the bracket, but not without rubbing.
- There are no clear indicators for mounting front/top fans, just hundreds of stamped out holes, and a few counter sunk screw holes for radiators. This means if you're mounting front/top fans, you'll have to slide the fan around a bit until you find 4 holes that line up.

Overall it's a solid case, but there's definitely more penny pinching going on than not. If they charged a few dollars more for rubber grommets and removable expansion slot covers then it would easily squash my more severe critiques.
9
2
Reply
Last edited by spartanvi September 22, 2020 at 12:58 PM.
Joined Sep 2016
L4: Apprentice
> bubble2 320 Posts
98 Reputation
Original Poster
bitinabyte
09-09-2020 at 10:16 PM.
09-09-2020 at 10:16 PM.
Quote from spartanvi :
Just used this case in a build for a friend this past Friday. Good deal for
That's some really good feedback!
1
Reply
Joined Dec 2013
L5: Journeyman
> bubble2 610 Posts
45 Reputation
alaindesjardins
09-10-2020 at 03:46 AM.
09-10-2020 at 03:46 AM.
Been looking for a cheap case. I have a ton of mining gear I need to repurpose for my kids to use for remote learning. But I need atx not micro atx Frown
6
Reply
Joined Oct 2012
L3: Novice
> bubble2 241 Posts
26 Reputation
Schmak01
09-10-2020 at 11:26 AM.

Our community has rated this post as helpful. If you agree, why not thank Schmak01

09-10-2020 at 11:26 AM.
I have this case for my LAN party rig, love it. I fit 5 140 mm fans and 1 120mm on it, great airflow. I have a 3600, with a 5600 XT and 2 SSD's all mounted in it:

https://i.imgur.com/FfQdONM.jpg
1
1
Reply
Joined Jun 2011
L4: Apprentice
> bubble2 338 Posts
26 Reputation
UglyTimeTraveler
09-10-2020 at 11:34 AM.
09-10-2020 at 11:34 AM.
It's strange that it can't mount radiators at the top, I'm assuming clearance is the reason, so either a front-mounted 240Mm or rear-mounted 120mm are the options according to cooler masters website
Reply
Joined Jun 2011
L4: Apprentice
> bubble2 338 Posts
26 Reputation
UglyTimeTraveler
09-10-2020 at 11:40 AM.
09-10-2020 at 11:40 AM.
Quote from Schmak01 :
I have this case for my LAN party rig, love it. I fit 5 140 mm fans and 1 120mm on it, great airflow. I have a 3600, with a 5600 XT and 2 SSD's all mounted in it:

https://i.imgur.com/FfQdONM.jpg
Is the website incorrect then when it states only 2 140mm fans fit in front? That would make my day, I have 140mm fans already and don't want to purchase this unless they fit rear/top/bottom.

Page says only 2 140s up front:
https://www.coolermaster.com/cata...box-q300l/
Reply
Joined Jun 2015
L2: Beginner
> bubble2 94 Posts
18 Reputation
NEOchildish
09-10-2020 at 12:18 PM.
09-10-2020 at 12:18 PM.
Quote from spartanvi :
Just used this case in a build for a friend this past Friday. Good deal for <$40

Some notes:
- It starts off on the right foot with stylized magnetic mesh (i.e. dust filters) on the front and top of the case, but like you'd expect in this price point ($50 at Microcenter): there's no pre-installed intake fan.
- The windowed side panel feels like flimsy plexi-glass (i.e. plastic), but the panel has a neat "premium" feature that allows you to relocate the USB/audio/power button panel to the top, bottom, or front of the side panel.
- There's plentiful cable management channels along the tray, but none of them have rubber grommets. While it does have anchor points for zip-ties, there are only 3 of them and all are along the channels. Could really use at least one directly behind the motherboard tray to tie-down the 4/8-pin CPU aux power as well as top/rear fan cables.
- Speaking of the rear motherboard tray area, there's ample space to mount a 2.5" storage drive or even a full 3.5" harddisk drive.
- The 4 expansion bays are all the extremely cheap push-out design. Have to be really careful when removing these as you can bend the remaining thin steel frame.
- The PSU requires a bracket which serves no apparent purpose but to complicate the installation and potentially block your AC power cable. We used a Seasonic Focus Gold 650W semi-modular power supply, which cleared the bracket, but not without rubbing.

Overall it's a solid case, but there's definitely more penny pinching going on than not. If they charged a few dollars more for rubber grommets and removable expansion slot covers then it would easily squash my more severe critiques.

Very valid points. I used this case for my personal build. The expansion bays are Incredibly cheap! I was one of the unlucky customers to have bent it. Otherwise I was able to get decent cable management so I'm satisfied.
Reply

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Joined Oct 2012
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> bubble2 241 Posts
26 Reputation
Schmak01
09-10-2020 at 12:22 PM.
09-10-2020 at 12:22 PM.
Quote from UglyTimeTraveler :
Is the website incorrect then when it states only 2 140mm fans fit in front? That would make my day, I have 140mm fans already and don't want to purchase this unless they fit rear/top/bottom.

Page says only 2 140s up front:
https://www.coolermaster.com/cata...box-q300l/
I have 2 140's in the front, 2 on the top, and 1 on the bottom, very much overkill, but I have the top and back and exhaust, with bottom and front as intake. The top rotates pretty slow to make sure the hot air gets pulled out, but not impact the flow of cool air to the CPU.
Reply
Joined Dec 2009
L4: Apprentice
> bubble2 818 Posts
143 Reputation
blckgrffn
09-10-2020 at 12:24 PM.
09-10-2020 at 12:24 PM.
Case has huge (har har) issues when it comes to clearing after market coolers. If you aren't doing AIO water kits, be aware this thing is basically just a smidge short for Hypers, etc. This makes it pretty hard to recommend for me.

I ended up getting a Artic Cooling Freezer 7 X for my kiddos build in this case because the stock Intel cooler and the Gigabyte fan control was just annoying me so much with hard spin ups under load and big drops. The Freezer 7 X works better than stock, is quiet but by no means a solution for any big TDP CPU.

Everything else is passable on this case. Huge GPU clearance. Easy to work in. I initially bought it for horizontal use and it worked great at that.

Worthless bracket for PSU and the weird one on the back over the PCIe slots is also a headscratcher. Plastic window is all streaked/scratched up despite pretty careful handling.
Reply
Joined Jul 2019
L5: Journeyman
> bubble2 801 Posts
102 Reputation
AlphaDag13
09-10-2020 at 12:47 PM.
09-10-2020 at 12:47 PM.
Darn, I just bought this case like a month ago to re-purpose some old parts into a Plex server. It's a really sharp looking case and was really easy to work with. I highly recommend it for someone needing a smaller case. I do recommend adding another case fan or two to it though.
Reply
Joined Oct 2017
Fat Wallet Refugee
> bubble2 3,810 Posts
931 Reputation
SeikenDensetsu
09-10-2020 at 12:54 PM.
09-10-2020 at 12:54 PM.
Can this fit Noctua DH-15?
Reply
Joined Nov 2013
L5: Journeyman
> bubble2 822 Posts
46 Reputation
portpower
09-10-2020 at 12:56 PM.
09-10-2020 at 12:56 PM.
MIR from Cooler Master? That's a hard pass.
Reply
Joined May 2013
L4: Apprentice
> bubble2 323 Posts
129 Reputation
spartanvi
09-10-2020 at 01:42 PM.
09-10-2020 at 01:42 PM.
Quote from SeikenDensetsu :
Can this fit Noctua DH-15?
Not without modification. Max CPU cooler height this case supports is 159mm, and the DH-15 is 160-165mm. Even reading in reviews that a 158mm cooler, the NH-U12S, touches the window panel when the case is closed.
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