Excuse my typos - I am still getting used to Corsair K60, which rocked my gaming world!
After un-installing Intel drivers, my DPC latency went down by about 10-15us. nVidia drivers still skyrocket up to 600us, but all other drivers are peachy now! My game load times are now 1-2seconds longer, BUT stuttering I used to have immediately after load screens is GONE! More smoothness after load screens is worth it all the way.
I also disabled ASMedia stuff. I am aware that ASMedia has a bad reputation for having issues, but if you update to the latest firmware, it becomes almost problem-free as long as you stick with MS drivers. Windows 8.1 Pro native drivers after the recently released Update 1 are better than any ASMedia drivers and most Intel chipset drivers.
I am not sure how in the world your board lacks Intel MEI... I think all Intel Z58-87 have it. Look in Device Manager, under System Devices - Intel Management Engine Interface. It also received a new firmware recently - 8.52 something-something for Z77. Station-Drivers is a good place to get the latest drivers for all Intel devices. As far as Intel MEI goes - use the Device Manager .INF installation ONLY. That way you get the best performance without Intel crap-ware.
I strongly advice to keep all motherboard OROMs up to date, using UBU tool. It is very easy to use and it improves performance for quite a few onboard devices. For some reason, Z77 BIOS updating ended, while individual OROM updates are still being released. All in all, update all your motherboard OROMs using UBU and the latest firmware tools, but do NOT install drivers for those devices. Here is more info on UBU - http://www.win-raid.com/t154f16-Tool-quot-UEFI-BIOS-Updater-quot-UBU.html
. It gets a bit tricky when it comes to ASMedia updates. You have to use Station Driver ASMedia USB 3.0 .951 firmware separately from UBU, but to update SATA, you need to download the latest ASMedia SATA firmware, find CMSCORE line in UBU tool and insert the ASMedia SATA firmware... PM me if you want to know exactly how to do it.Edited by MonarchX - 4/13/14 at 3:30pm