Yesterday I bought an ASRock Z77 Extreme4 motherboard and an i5 3570K to go along with it. I put it all together and when I try to power up the system, Dr. Debug first says "20" for a couple seconds, and then displays "53". I don't see error code 20 anywhere in the manual but 53 is "No usable memory detected." I have 2 sticks of G.Skill 1333 4GB ram. There are 4 slots and I have installed them in every possible combination of slots. Always gives me "53".
I looked at the official list of supported RAM for this particular motherboard from ASRock. I have F3-10666CL9D-8GBRL memory, and of course, my exact model is not on this list. However, F3-10666CL9D-8GBXL is on the list, and to my eyes it is literally identical aside from the heat-spreader.
Can someone please explain how there is even the slightest difference between these chips? The heat-spreader has to be literally the only difference, so I cannot figure out why my RAM is not accepted.
I've already done a little browsing around and heard about this particular motherboard needing a BIOS update, because the memory controller is located on the i5 itself and the BIOS the Z77 shipped with does not support the Ivy Bridge i5. Is this true, even for the most-recently purchased motherboards of this kind? What do I need to do if this is the case?