Broadwell 5775C on Phase
System Configurations:
Intel 5775C, C refers to Crystal Well technology that is the 128M eDRAM on the CPU.
This CPU has IRIS Pro 6200, the best iGPU from Intel so far.
Asus Maximus VII Gene
MSI Gaming 7
Gigabyte z97 SOC
Corsair GTX2, GTX3, Dominator Platinum 2666C10
Overclocking Thermaltake 3.0 Ultimate AIO:
Max Frequency of 4.8Ghz @ 1.55v 4c/8t and 4.9Ghz 1c/1t
Max ram speed of 2200Mhz tight timing @ 1.65v
Max iGPU speed of 1300Mhz @ 1.25v
Max ring speed of 4400Mhz at 1.5v
Overclocking Phase -60c:
Max Frequency of 4.8Ghz @ 1.60v 4c/8t and 4.9Ghz 1c/1t
Max ram speed of 2200Mhz tight timing @ 1.65v
Max iGPU speed of 1300Mhz @ 1.25v
Max ring speed of 4400Mhz at 1.5v
XTU 1200 @ 4.7Ghz
Iris Pro FSE scored 900
Aquamark 310,000
Memory:
Broadwell 5250U overclocks the same with memory, you must keep the speed down that you can set very tight. It is the Broadwell IMC.
You can use normal DDR3 voltage but you cannot load XMP profile over 2133Mhz nor can you run over 2200Mhz in speed reliably.
You can run tight timing under the speed limitation.
Iris Pro 6200:
There is not much headroom in the Iris Pro at stock voltages on phase but the scores do increase with this knob being adjusted.
I think there might be several power domains at work here where bios idle is at .200v, desktop is ~ .9v and 3D is ~1.2v. Setting .9 in bios and 1.2v from bios did not boot or locked up at windows loading desktop.
All boards failed at pushing iGPU to or beyond 1300Mhz.
Ring:
The default speed is 3300Mhz @ 0.8v, pushing it up hill it will do 4400Mhz @ 1.5v and more volts did not increase speed on phase.
eDRAM:
There is 128M of L4 cache on the CPU core, this is called Crystal Well technology. I can see where this can be useful if the application can take advantage of it.
The MSI board has the eDRAM divider and the default speed is 1800Mhz and the highest working option is 2Ghz.
Intel sent the eDRAM microcode update at the end of last month and manufacturers are late in creating bios updates. Your board probably does not have an updated bios ready yet for Broadwell with eDRAM.
Conclusion:
http://valid.canardpc.com/4wgfse
Broadwell C is for daily machines, office machines, anything that you are happy at stock speeds or just want to explore the platform. Excellent performance from these chips, I am still exploring the iGPU for a few more days.