Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: how many pci 16x slots does this board have?
Document: Pros:Great board for the price! Great onboard components! Hackint0sh compatible!Although, I had many problems with this board;1. There really isn't a better one for the price, and2. Gigabyte's support is awesome! They always answer the phone, and call you back to follow up.
(Freesco-logic based - very &#34;cat-friendly&#34; out of the box).SLOTS:Handles 4 GPUs (double width) just fine. Water cool those GPUs, and you can use ribbon risers to use the 2xX1 PCI-e slots and 1xPCI slot (long live my Creative card!).
"In addition to all the headache above, I also moved the single stick of memory to different slots (which didn't make any difference AT ALL). The one thing that DID WORK EVERY TIME, was to disconnect ALL of the SATA DRIVES! ALL = ALL (CD/DVD ROMs TOO)!This should allow you to get into the BIOS EVERY TIME!
I think next time I'll try a different brand board.
Start with the XMP change 2 values and done.I have to say, overall, once I got a working one, I have had a blast with this board, even &#34;Work&#34; is a blast&#34;. Desktop browsing and light work throttles down this 130W TDP CPU to a sipping 17-18W and still responsive.
Because if bad memory requests lie to my code, that application could crash and I could spend days trying to reproduce and fix a bug that doesn't exist.And that could make my employer (and consequently me) very very unhappy.So anyway, to anyone intending to eventually put 64gb of ram in this board, you might have better luck than me and get it to work.Or you might not.
Buy this board or wait for the EVGA &#34;x79 Black&#34; which is supposed to fix the awkward eVGA BIOS/CMOS circuitry/32 of 40 lanes support. Returned.- Ordered another of the Gigabyte identical boards to this from another eTailer. Working 2 months now under water (CPU, MOSFETS, 4xGPUs, after a month and half of reliable operation on air. Not sure what the deal is there.
But sending the board back for this problem is a major jeopardy for me with loss of time, etc. Since the board supports a total of four case fan headers and my computer with liquid cooled CPU and a cooling fan on the graphics card is humming along very cool and quiet, I am holding on to the board for now. One minor shortcoming, in my opinion, is the lack of an IEEE 1394 port. But it is not a show-stopper for me.
Some of which I wanted to shed some light on how to resolve.First off the F4 BIOS is NOT COMPATIBLE with a Radeon HD R7950 Graphics Card! You will get ZERO video output!Both the Final F2 and Beta F3t BIOS's are both compatible with the Radeon HD R7950.If you are using a 3.0 RADEON HD 7xxx Graphics Card, and your board ships with F2, DO NOT UPGRADE to F4!
This MB worked great for about 5 weeks then it started a power up shutdown loop, which I could only stop by unplugging it. After about 8 week along with the power up shutdown loop, I started getting BIOS corruption errors, on which the system would recover from the backup BIOS. I contacted Gigabyte support and I got a RMA number. I sent the board back and received a replacement MB.
Answer: it has 2 PCI 16x slots, 2 PCI 8x slots, 1PCIex slot, and 1 PCI slot