Does the Mpcie show in bios? It has caused people a lot of grief as will a UPS that is going bad. As far as the Intel Graphics, it won't install on mine either. I assume, like you, it is because it is not being used. Bu quicksink, I assume you are talking about the Lucid Logicx. I understand it will help quite a bit with video encoding, but It has caused a lot of people headaches in other areas or just getting it going. I believe it has to be set up in bios. But it combines the on board and your discrete graphics to work. BTW, Sata 2 won't hurt performance much at all. The OS uses primarially 4kb reads and response time. That won't change much, if at all. I still have a couple of sata 2 SSDs, and there is little difference in the sata 3 ones. Have you gone to device manager and expanded IDE ATA/Atapi devices? You should see Asmedia there. That is the Asus add on ports. I don't think they use Marvell any more. They started their own company. At least Asmedia is what is on this Asus Z77 board. While there, make sure you have no yellow triangles or grey exclamation marks on anything.
I've now managed to get the Intel graphics drivers and Lucid Logix software installed

However I haven't managed to use Quick Sync. For some reason the required files such as IntelQuickSyncDecoder.dll are missing and therefore no codecs that can use Quick Sync such as ffdshow and LAV decoder will function. I have not yet managed to work out why they are unavailable and why they have not installed with the Intel graphics drivers.
My Bios now shows the iGPU frequency as 350MHz and allows adjustments to the voltage, frequency and LLC etc. Therefore I'm happier about that as I don't like things withheld and made unavailable, it's like I'm missing out on something. The Intel QuickSync would be of benefit as I found out the other day when encoding 1080p down to lower resolutions where the encoding speed is now higher than my VP4 GT240 can decode which means it's slowing things down by a fair bit.
There is an option in my Bios in the GPU section of Advanced which is called something like render Standby enabled/disabled. That has always been enabled. I disabled it and rebooted and when I went back into the Bios, low and behold, the iGPU frequency had become available and all the missing options were showing.

That allowed me to install the Intel drivers and then Lucid Logix. BTW, the Render standby Bios option has been re-enabled and everything is still working fine. It seems like an obscure Asus Bios bug to me which is foiling the install for many people. I don't have any display connected to the motheboard display connections and never have!
I would like to get Quicksync up and running, it doesn't seem far away now, so hopefully it won't be too big a problem to solve.
Lister, I am looking at your board now, and you do have Marvell sata ports. I thought all the Asus Z77 boards used Asmedia. Sorry about that.
According to Asus, your Marvell ports should be running Marvell SATA 6G Driver V1.2.0.1020 dated 7-18-2012.
I noticed an option in my Bios in the connections section where the HD/AC97 Lan, USB3.0 can be enabled/disabled. It is called something like Firmware Check & update. That was disabled so I enabled it thinking that it might of been preventing the firmware update which I had tried on many times. The firmware update goes ahead but after rebooting, the firmware is still the same. I had thought that enabling the check/update option would allow the update, however after trying to update again, it made no difference, still back to how it was.
I believe that might be the driver that is installed, however without a controller showing in device manager it is difficult to say for certain. Hidden devices shows Marvell 91xx Config Device Driver which looks like the name of the filenames in that driver package so that could be about the only thing to indicate the driver and that is v1.2.0.1020. That or Marvel Unify Config device which shows. However nothing for Marvell under any of the Storage controllers or IDE/ATA controllers.
If you have any ideas about QuickSync then I would like to hear them. I really would like that to work as it would mean not having to purchase a new graphics card with a VP5 engine decoder such as the nVidia 6 series. Decoding is all that it would be used for so it seems a waste of power when it wouldn't be used for anything else but decoding assistance.