Originally Posted by Lolliedieb
Edit: I wanted to add: Has anyone an advice on how to became 2400mhz ram stable? I have Kingston HyperX Beasts here, specified to DDR3-2400 @ 1.65v, but currently I have difficulties getting them stable. There was a voltage bug in the 2133mhz preset to (my board made it running 1.5v instead of specified 1.65v), but since I changed that manually 2133 is pretty rock-stable (3dMark, Furmark, 3hours of continuous playing Anno 2070)...
After quite some time spent testing (and reading through all posts in this thread, which isn't easy due to lots of pointless arguing), I managed to run 2400mhz ram stable by increasing DRAM voltage, otherwise I ended at 2133 with quite loose timings. I use Kingston PredatorX 2666mhz CL11 2x4GB, which are Hynix chips, just like your Beasts I believe and Hynix on AMD is known to require a little bit more love. However I only loaded XMP profile #2, which is 2400mhz 11-13-13-30 1T but at 1.695V ~1.7V. It appears stable after 1hour full strestest in AIDA64. Anything lower than 1.695V won't work longer than 15minutes. Ofcourse I haven't touched profile #1 at all...
About stock VID, I believe NB is at 1.275V on my MB (ASRock FM2A88X+ Killer with 1.70 BIOS) which seems quite high to me. Whatever the reason, I wouldn't go past 1.325V ~ 1.35 ever as I wouldn't go past 1.45V on 28nm CPU. People claim there are walls at 1.4V for NB and 1.55V for CPU, but that's just too much imo! Also minimal NB frequency for 2400mhz RAM is 1500mhz, so stock 1800mhz is aplenty. I run it at 2000mhz and 1.2875V atm, but no idea how it will behave after I start upping iGPU frequencies from stock.Edit:
It appears that stock VID on cpu is 1.325V for 3.7~4.0ghz, but only 1.25V on NB. Be careful with it since we cannot get actual reading of NB voltage and also take into consideration LLC (ASRock has reversed % on LLC it seems, extreme setting is 0% actually, while 100% is standard/auto).
On a side note, my 7850k throttles under iGPU load, just like others have reported (and there is nothing so far that worked for me to avoid it - sometimes it jumps to full speed for few seconds, but thats it). For gaming without dGPU, I would leave CPU side stock since it will throttle anyway, and just bump up RAM, iGPU and litte bit NB frequency to 2000mhz as a last touch.Edit:
About temps, I use ASRock utility F-stream for basic readings, Aida64 and AMD Overdrive for more detailed info. Also note, that ASRock bios puts your system under decent load, so temp there should be considered as temp under load.
Hope it helps you get your Beasts working at 2400!
Just in case for the reference: AMD A10-7850k, ASRock FM2A88X+ Killer, Kingston PredatorX 2666mhz CL11 2x4GB, Kingston V300 SSD 240GB, FSP Raider 650W 80+silver PSU active, CM N400 case with 3x120mm fans and CM Seidon 120V +1pull fan).Edited by Spectrum Legacy - 3/22/14 at 4:49pm