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

Input:
Question: How many gigs of RAM can this support, and how many RAM slots does it have?
Document: Nice board, lots of features including a very configurable bios. There were many functions that I will never use such as CPU, RAM and video over clocking.It has USB 3 ports, and an HDMI port. Nice. Im sure there are more advanced boards, but I dont need them. Full ATX so you have lots of room to work.
I gambled by bying this mobo and I lost. It lasted about half a year and then started going down.First, at some point, the system refused to boot. I opened the case, found out the red light on the mobo next to RAM slots was on. WTF, I didn't change anything! I reset RAM and got the system going.
Turned it off, left. Came back and turned my machine on. DRAM led. Could not post. Figured it was the exact same problem as before, and it seems it is. Will not post with RAM in the either furthest left two slots.Took RAM and re-tested in other machine to make sure it hadnt died, and it seems the board killed the RAM as well.RMA for full refund.Conclusion:Good looking product, would have loved to use it.
This product is currently not working with two RAM sticks in dual channel configuration. After the third call to Asus support, they agreed to RMA this board, but I need to take photos and jump through more hoops because I do not have the serial number, which appears to have only been on the box. To be clear, this board was a problem when first purchased in Nov 2013, but Amazon exchanged it without issue. Great customer service as usual.
I bought this board the first time about 2 weeks ago or something like that.I was excited to get it, unboxed it put it on the bench and put my new processor and RAM in it. Got the DRAM led and it would not post. Switched the RAM up in weird slot variations and found that the furthest left two slots were dead. RAM was BRAND new and tested in another system and was fine.RMA and exchange.Got the second one.
First and foremost: this board looks sweet. It's beautiful, sleek, and very clear. The black and blue color combination is one of my personal favorites, and it looks absolutely amazing when paired with blue RAM (I chose Corsair Vengeance). All of the slots are clearly labeled and the manual is very clear and includes a step by step setup, which is especially helpful for new builders. The manual also includes a list of all the compatible parts so you can double check everything before putting it together.
You see all those PCI express slots? Don't count on being able to use them all. There are 16x PCI-e slots, and two 1x PCI-e slots. According to an external review on tomshardware, despite having a z77 chipset, this board does NOT support all the features of the z77 chipset. This boards is apparently PCI-e retarded.
I have used many different type of motherboards and this is one of the best that i have used. Asus products on a whole are very good.
always trusted ASUS. Maybe I am lucky but all Asus boards I've bought(too many to remember) (work or home) always work the first time and haven't had one that failed on me yet. Can't say the same thing about other brands (eg: gigabyte/msi)...
What a bull, even warming up for this will take more than 20 minutes: finding a good spot, taking the whole bloody puter apart, arranging everything... Getting the BSOD that does not appear all the time. Many hours of work!! They like don't have a comprehensive test utility???? What a bull. Pathetic.Now, how about replacing?Here's the replacing procedure they quoted:-----------------1.
Answer: 4 Slots. Total of 32GB supported.