In and Around the Corsair Obsidian 650D

Externally the Obsidian 650D is basically the mid-tower version of Corsair's larger 700D and 800D enclosures, and people who aren't fans of the Graphite 600T's curved design are liable to appreciate the monolithic black style. About the only thing that might seem out of place is the window on the left panel; I have a sort of "take it or leave it" feeling about windows on cases and would probably prefer either a solid panel or a 200mm fan intake.

The front of the enclosure is very spare and clean. It's almost entirely black aluminum, with four drive bays. The power button and HDD indicator light are both above the bays along with a door that hides the front I/O. It's a nice stylistic touch but I'll admit I found myself wishing that door was an external 3.5" bay for a card reader; your mileage may vary and I certainly can't ding Corsair for the decision since inside and out, it looks good. Behind that door is also the reset button and frankly that's probably a perfectly fine place for it. Below the bays is a removable fan filter for the front 200mm intake fan.

When you get to the top of the 650D, you'll find the SATA hot-swap bay and fan controller hidden by a sliding plastic door. The door on my review unit was a little bit stiff, but it did work fine otherwise. The bay will easily accommodate a 3.5" or 2.5" drive. Behind it is the massive vent for the top-mounted 200mm exhaust fan, and this is a big improvement on the 600T's design. The vent here is perfectly flat and can accommodate a pair of 120mm or 140mm fans instead of the 200mm fan for larger water-cooling radiators. What I really appreciate here, too, is that the removable filter on the top of the 600T is gone and the vent is just built into the case. That filter was a nice enough touch, but over the last few months mine has actually developed a bit of a rattle that requires "concussive maintenance" to silence from time to time. On boutique builds it also had a habit of getting stuck.

Finally, the back and bottom are pretty standard fare. The bottom of the case has a removable filter to go under the power supply's intake fan and is lifted off of the ground to allow you to place the case on carpet, while the back has a small hole for routing the USB 3.0 passthrough cables along with a generous eight expansion slots (one more than the pricier 700D and 800D cases), a 120mm exhaust fan, and two rubber-lined holes for passing water-cooling tubing.

Internally, the 650D is an exercise in deja vu. I have been inside this case before. Corsair retains the latched side panels found on the 600T and these are still one of the best features I've ever seen on any case, period. Getting into and working inside the 650D remains just as easy as the 600T was, so if you're the tinkering type Corsair has your back. Unfortunately, though, the side panels on the 650D don't feel quite as secure and don't go back on quite as easily as the 600T's did, and I could see with the 650D where they might develop a rattle over time.

But the inside design is stellar. The two three-drive cages both feature tool-less drive trays that can support 2.5" or 3.5" drives, once again making a strong argument for using drive trays in modern designs. The top cage can also be removed and placed alongside the bottom one to allow for extremely long video cards, though I doubt that will be necessary: there's already 13.5" of clearance to begin with. Corsair also includes a generous opening in the motherboard tray for mounting heatsinks, and there are an abundance of openings with which to route cables behind the tray.

If I have one complaint to really carry over from the 600T, it's the power supply mounting system. Corsair includes an additional, movable support for the power supply, but it's held in place by two thumbscrews and frankly it's extremely awkward, can be difficult to line up, and is ultimately superfluous. This is an extra piece of complication the case just doesn't need, and hopefully in a future revision they'll just eschew it entirely. It allows for tool-less power supply mounting, but it's just not necessary.

Introducing the Corsair Obsidian 650D Assembling the Corsair Obsidian 650D
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  • mscrivo - Wednesday, July 11, 2012 - link

    you're crazy if you can't hear the noise. I just bought one of these cases, and 2 days in, its driving me nuts. Its more than audible, especially compared to my old P180B. Reply
  • ooostephen - Saturday, January 14, 2012 - link

    same here. i tossed some 'vent filters' used for air conditioners, in the front, and that made a noticeable diff. it also helps keep the dust out. Reply
  • DanNeely - Friday, July 29, 2011 - link

    Even if the cooling worked well, this would be a killer for me. It looks ugly, and most mobos are coming with a header now for an internal connection making the kludge obsolete. Reply
  • LtHawkins - Saturday, July 30, 2011 - link

    I just built a system and got around this by connecting the USB3 expansion panel that came with my motherboard to the mobo header, then connected the 650D USB3 connector to that, but I'm keeping it all internal - I tucked the panel into one of the external drive bays that I'm not using. Won't work for everyone, but if you have a spare drive bay, theres no reason to have wires come poking out the back of the case. Reply
  • Locklear - Friday, July 29, 2011 - link

    Seem to remember Corsair stating that they would release a substitute frontpanel which has usb3 internal header connections instead of the current one. This one will be available on their web-shop. No idea about the timeframe though. Reply
  • darckhart - Friday, July 29, 2011 - link

    free replacement? or paid? i hate how some charge you for something that it should have come with in the first place. (i'm looking at you evga and your high flow brackets for the 580s) Reply
  • Locklear - Friday, July 29, 2011 - link

    As far as i remember it's not a free replacement, as it's not a defect. The case (and all other cases with usb3 front ports i know of) was designed like this because internal usb3 headers on motherboards were not that common when it was designed, so they opted for a "universal" solution instead.

    There are ways to work around the problem with things like this http://www.bitfenix.com/global/en/products/accesso...
    But I agree.. It's not the ideal solution.
    Reply
  • Goty - Friday, July 29, 2011 - link

    Solution for negative pressure: simply turn the exhaust fan in the top of the case around. I built a PC for my father in this case and it works just fine. Reply
  • Wieland - Saturday, July 30, 2011 - link

    That will get rid of the negative pressure, but it will introduce other airflow problems, inefficiencies.

    That intake will be right next to the only exhaust so a lot of the air it blows in will go straight back out of the case. This cold air will take up some of the capacity of the exhaust fan and make it less efficient.

    The top fan is oriented almost directly opposed to the airflow coming from the front of the case, and the opposing airflows will probably create some dead zones. If you have a big tunneled heatpipe cooler oriented front-to-back (like my Kingston XT-1264), it will push air around and away from it.

    With that big open vent on the top and positive air pressure there's bound to be some recycled hot air. The fan filter they removed will now be an absolute necessity to keep out dust.
    Reply
  • EJ257 - Thursday, August 11, 2011 - link

    I have the HAF932 with a similar fan setup. I really think the big fan on top is a great idea because the heat likes to collect near the top of the case. I turned the back fan around so its acting as an intake too and I haven't had issues with it. So now the airflow is front/back intake, top exhaust. Reply

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