I have had it for about a year now on an ASROCK B560M PRO4 MATX motherboard and CORSAIR VENGEANCE LPX 16GB DUAL CHANNEL 2666MHZ memory. I am quite satisfied with this processor. (POSITIVES/NEGATIVES are a bit below)
POSITIVES:
1. Good performance (meaning games and Blender for 3D rendering don't lag) I generally don't push it to 100% because I play relatively lightweight games. IMPORTANT INFORMATION: THIS PROCESSOR (with default settings) OPERATES AT 65W BUT IT CAN BE SET TO GO UP TO 120W IN THE MOTHERBOARD BIOS AND YOU GAIN MUCH MORE PERFORMANCE. WARNING: THE STOCK INTEL COOLER CANNOT COOL IT AT 120W, SO BUY ONE FOR 25-40 € BEFORE DOING THAT.
2. Stability, it has not crashed on me once. (Except for one time when it wasn't the processor's fault but a problematic RAM kit I had. Luckily, after I changed it to Corsair LPX, it works fine.)
3. Temperature, this processor does not get too hot, so you don't need an overly powerful cooler. (For a cooler, I would recommend a good one for 25-40 €.)
4. Value for money. Now with the 12th generation Intel processors, it's not worth it because there is the i3 12100f (WHICH IS GREAT FOR ITS PRICE), but if you want 6 cores and don't want to spend 200+ € on the i5 12400f, then I would recommend it.
5. Compatibility. This processor can be used with b560, b460, etc. motherboards. (Check the specifications before purchasing) (ATTENTION: IF YOU USE IT WITH A B460 MOTHERBOARD, IT WILL NOT HAVE PCIE GEN 4.0 CAPABILITY, BUT IT'S NOT THAT BAD IF YOU'RE NOT USING AN EXTREMELY FAST M.2 SSD OR GRAPHICS CARD) For RAM, I would recommend 16GB at 3200mhz CL 16 dual channel if you have the money (around 70€), or a more budget option would be 16GB 2666mhz CL 16 dual channel (around 60€) (This processor doesn't suffer much from single channel slow RAM unlike AMD, but a good RAM kit gives a bit more performance and I think it's worth it) For graphics cards, I would go up to an RTX 3070 at most, otherwise, you lose performance. IMPORTANT INFORMATION: THIS PROCESSOR DOES NOT HAVE INTEGRATED GRAPHICS, SO YOU NEED TO INSTALL A GRAPHICS CARD TO HAVE DISPLAY.
NEGATIVES:
1. STOCK COOLER. The Intel stock cooler is garbage compared to AMD's. It's really loud. (Get another cooler for 25-40 € and your ears will thank you.)
2. Overclocking, I generally believe that overclocking is not worth it now because processors are already quite fast, but for those who are into it, this one has "<f>" at the end of its name, which means it cannot be overclocked. Something you can do for more performance is to set it to run at 120W, but with a different cooler because the stock one is bad.
That's all I have to say about the i5 11400f. I think it was a good value for money, but now just get the 12th generation Intel processors because they are MUCH better. I only recommend it if you need 6 cores and don't want to spend 200+ € on the i5 12400f. I will add an "EDIT" if I change my mind about something, I hope my review helped you with your purchase :)