Since the 5775C turbo is mentioned as 3.7ghz, that would be for 1 core. More cores being used means it will run at a lower speed. However, "Multi-core" enhancement should force the processor to run all 4 cores at the maximum turbo speed of the chip. You can check this setting to ensure it is enabled. Perhaps, however, it isn't working correctly with Broadwell chips.
Unfortunately, I don't know how much help you can get for the 5775C. So few people have it that it's tough to provide any guidance... because it's Broadwell and not Haswell, there's no established methodology as to how to push these chips for OC.. for Haswell, Input voltage was quite important. Is it for Broadwell? Maybe.
It could be that the UEFI/BIOS were never properly designed for Broadwell, too... only just enough for compatibility due to how it ended up being released.
I always loved these Impact boards.
Time to get myself one.
Wanted to see what the Skylake one offered but i really want the M.2 connectivity. (want to ditch all the storage wires and with the 950 Pro 1 TB on the horizon ...)
So if i may some questions:
1. Can i use the Impact VII without the Supreme FX audio card ? (maybe silly but just to be sure)
2. Can i remove the the wifi/bluetooth card ?
3. Any problems with the Samsung 950 Pro 512 GB - bootable,drivers, full speed, no heating etc ?
4. What was the problem with the screw for the mPCIE i read some time ago ? (can't find it now.)
5. Any other potential problems, heads up of any nature?
6. Anybody with a 4790k using it at stock with the stock intel cooler, what are the temperatures in gaming load?
having issues with i7 5775c wont go past 3.6ghz
any ideas what this could be?
Perhaps you can find it in old stock, but I think many Z97 boards are now discontinued.