Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Can you swap the position of the two drive bays and mount the top bay at the bottom? I'd want to fit one long video card in the top two slots.
Document: I'd recommend sticking to what comes with it if you want a quieter case though.-Built in fan controller is simple, but effective-The hard disk bay is split into two pieces. If you have 3 or fewer drives you can remove the upper 5 bays exposing a *lot* of space.
Mounting position for SSDs on the back panel is absurd. Hint: the mounting screws for the SSDs are under the motherboard. I chose not to use those positions and easily mounted the SSD into one of the drive bays.2. The fan connectors are three pin .. would have been nice if they were 4 pin.3. The case USB port wires do present a small challenge in mounting an optical drive into the top bay .. minor.4.
There were no defects, flaws, our missing components in my order from Goodios on the Amazon Marketplace.The case has great functionality and easily fit my Hyper EVO 212 CPU cooler, as well as my MSI GTX 770 OC Twin Frozr. If you want to take advantage of motherboard fan controllers for every available position in this case, make sure your MB has CPU+6 chassis fan pins (2 front, 2 top, 1 back, 1 bottom).
In my book, this makes them useless. Not that big a deal; this beast has plenty of drive bays (so long as you aren't installing one of the really, really long video cards and have to pull the second set of drive bays to make room).None of the above should be taken to mean that this is a bad case; it is not. The build quality was high overall, and it is quiet, as advertised.
The GTX760 card was a bit of a tight squeeze, and I had to reroute the USB3.0 connector a bit, but everything fit in the end. No problems with cables reaching; I bought 18&#34; SATA cables from monoprice and had plenty of slack, which I hid behind the mobo along with all the other cables.Airflow: Two 140mm fans, one in the front blowing in, one in the back, blowing out. Good filtering and seems like easy to maintain.
Fractal-Design's own 140mm fans with square frames just snap into place. I had a Noctua round frame fan that I wanted to mount, so I moved the Fractal-Design 140mm fan from the top rear of the case to the front mount frame and installed the Noctua in its place.The door panel wants to close itself because the front feet are taller than the rear pair. That can be annoying when I'm using the card reader and Bluray drive I've installed behind.
Some people are complaining about the SSD drive being required to mount on the back. If you have a 2.5 inch drive it can just as easily mount into the regular HDD trays since they have two sets of screw holes.The other caveat to this case in my opinion is that the top LED is a bit bright for my liking. Something more subtle would have been better.Everything this has been said by other commenters who go more details. I LOVE this case.
For me, this is a plus. I have an LG Blu-Ray burner and a card reader in front. This is all I need. For some, the lack of extra 5.25" bays may be a downside...it's perfect for me.The removable hard drive trays. There is room for 8 hard drives in the R4. This is split into 2 sections that are stacked on top of each other. The top section of 5 HDD mounts is completely removable via 2 internal thumbscrews.
For one, it was big. I know it was big, but you never really appreciate the size until you get the real deal. Big means heavy. This means it will be harder to move the case around. Of course big has its upsides. I can now fit bigger aftermarket CPU-coolers as opposed to my old case.There is also some difficulty encountered in installing the components into the case as the manual seems insufficient. One difficulty I encountered was with the drive bays.
I'll be installing one more 140mm intake fan above the existing one, that sits at the bottom half of case's front. More mounting options if you wanted to add more fans.Hard drive bays: Great & modular. The upper cage is rotatable/removable. I actually took mine out for better airflow, since the lower bays are enough for now.
Answer: If you are referring to the two 3.5" cages you are unable to swap them because they are significantly different form factors.  You can remove the top or rotate it.  I was able to fit two 770gtx's in my case (fairly long cards) with the top bay rotated so it is open to the front/back of the case.  I am unsure if it would fit the other way because it has been a while since I built my system.  Don't rely on this but I THINK with a tight fit on the power cables it would fit the other way.  With it rotated 90 degrees and SLI graphics cards starting in the 2nd slot the top two drive trays are clear which would allow for 5x 3.5 drives plus the 2x 2.5 drives mounted to the back of the motherboard tray and whatever you wanted to put into the two 5 1/4 bays.One thing to watch out for is cabling in the bottom cage.  If the connectors are facing the right side you really need 90 degree cables but they need to be opposite the normal direction ('left angle') to avoid the side panel pushing on them.