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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
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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
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Editor's Notes & Price Research

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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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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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#3
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.
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Last edited by spartanvi September 22, 2020 at 12:58 PM.
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#4
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!
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#5
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
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#6
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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#7
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
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#8
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/
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#9
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.
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#10
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.
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#11
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.
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#12
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.
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#13
Can this fit Noctua DH-15?
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#14
MIR from Cooler Master? That's a hard pass.
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#15
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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