Uh oh, that is not good... good thing you posted this!
This configuration is very, very bad and should be fixed asap. If you are on your computer turn it off and fix this. Read the instructions from another computer that is being actively cooled and not heated.
Now rather than explain what you did wrong I will first list the principles of a good cooling system so that we can understand what went wrong:
1) The user should take note of the location the computer is to be placed
2) The user should take note of the environment of the system
3) A system should always try to achieve a vacuum or at minimum stabilized pressure but never suction
4) Principles of fluid dynamics should take full priority in the positioning of all internal components and even the external position of the system if possible
5) Redirection and focus fans should be used to adjust the main pressure channels strength, position and heat levels; ducts can be used in rare cases
6) Recirculation should be avoided at all costs, do not generate spirals within the pressure area
7) Ensure that internal redirection and focus fans do not create any recirculation spirals
8) If unsure user is recommended to test fluid dynamics with a fog machine (have system powered off during this test, only allow the fans to run)
9) System should always have a full temp probing system to ensure that no hot spots are present and components damaged.
Hopefully it is apparent which of these you failed to do. For reference you need to have that other fan turned around as you are putting too much air and not taking enough out. Also I would bet that without this increased vacuum pressure your front intake fan is not supplying any air to your upper level components. Thus there is virtually no cooling for your ram or chipset. In addition it is likely that your back fan is recirculating the hot exit air from the top fan because of the flowing: In you case top air is redirected to the back but this would logically rise b/c it is hot so not much would be sucked by the back fan unless your under a desk but the situation is not the same for the air leaving the power supply and the gpu and the rest of the air that blows though those open slots in the back. This air will rise and will be sucked up into the back fan that then heats the cpu but more importantly the totally uncooled chipset and ram, making the system more unstable than it should be. Now it is understandable as there is no temp sensor in your ram so you could not have know that is has got to be running really hot. Just turning that fan should significantly improve your system and also adding a redirection fan to focus more air to the top part where the ram and chipset are might not be a bad idea. Most importantly I would recommend getting some probs and messing around to see what works best.
To assist I have attached an image: Red shows where the heat is being directed and white shows the path of least resistance in the case of the top section the center white line shows where the vortex will naturally generate based on theoretical molding *(this is without taking the cpu heatsink into account) and the side lines show the boundaries for the max pressure area.
* Molding the cpu fan requires higher resolution flow calculation more than I can correctly get off the top of my head. Also most of you would just get confused unless I made a lot of different colors but then trying to remember what is what would confuse you. Then I would also need to take into account the resistance of other objects and how they would reflect the air and how this would decrease overall pressure and thus the location of the channel. Regardless of these variables the overall pressure channel is still mostly impacted by the position of the two fans that were taken into account. Also I think that the point as to the problem is clearly made without needing to turn this into a lecture of fluid dynamics.
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