It is not acceptable that most modern heatsinks are expensive. This Hyper TX heatsink is NOT expensive but perform it's role IMPRESSIVELY. I am still looking for the place where you can get this. It is really difficult to find the stock.
1) Based on the size I noticed that this can be fit into E521. But, I had to do some modifications which could be very difficult. For the modifications, I used simple tools and materials that were in my house.
Lets start this adventure, please consider that I use vacuum cleaner to clean the dust on the motherboard. (some people may argue about the static electricity but it is not the question here)
Remove the current heatsink in E521. (below)
Use screw drive to unscrew the two screws (fully) and pull up the heatsink (don't force to pull out otherwise, the cpu will also come off with the heatsink) horizontally so that it will come off. If you are not sure please look the pic above and below.
The Intel Socket Bracket is needed here. Break the plastic pins, using a pliers (below)
As you have noticed the Intel bracket will not fit. (Below)
You must bend the bracket otherwise it will be interfered with the copper heat pipes and use the roundfile to reshape the Volt holes.
The bracket is isolated from the Mobo by using nylon rings, never know it touches some electric part.
3) To connect to cooler to the brackets I made bridge plates made from a beam connector, which are normally used by a carpenter or better use a 1mm steel strip from your hardware store. Using a electric saw I made the bridge and a drill for the holes (Below)
After you have done all these, you might like to try stress test by using softwares. But, after the stress test, you should check all of the bolts because they will become loose. screw tightly.
Looks simple but if your not into the tools go for the Noctua (option 3) , its a lot of work and you need a lot of measuring to do it properly.
Some of the other pics:
Again, did a bit of overclock and see if it is acceptable in terms of stability.
the highest temp reached was 47/51 C with the clock speed o 3474mhz.
There is no temperature rising in all other components.
It is highly stable.
Cheap, and according to tomshardware, it is a good cooler and it is better than Noctua.
Non Dell coolers are compact. It will alow us to install long and big video cards
It is labor intensive to install, do not go for this heatink IF you don't have right tools or if you are a clumsy person.