Hello, i have my trusty old i5 2500k and some kingston low profile 1333Mhz ram. I managed to overclock cpu to 4.3Ghz 1.3V and ram to 1600Mhz (without bumping voltage i might add, i am really impressed with that, didnt want to bump voltage since ram has no heatsink). I really like round numbers and 4.3Ghz bothers me, i want 4.5Ghz. I tried 4.5Ghz at 1.3V, system didnt boot. At 4.4Ghz it crashed under prime95. At 4.3Ghz it is stable in prime95 and memtest86+. After 5 minutes in prime95 it reaches 70C on hottest core. As you see i am pushing limits since in the summer it will be about 8C hotter. This is an old chip so i am not afraid to run it at 75C at full load, but everything over i would rather not do. I am using Xigmatek xigmatek hdt 1283. So my question is, is there any other voltage besides CPU voltage, that could help me with my overclock. As u can see i cannot push CPU voltage any more.
P8Z77-V LX motherboard, i left most things on default, except turning off virtualization and the c stuff. I left speedstep on because i like energy saving on idle. I didn't change any voltage besides vcore
Hey fellow i5-2500K owner, I've got a similar system to yours, i5-2500K, Kingston 1333 (9-9-9-24) and 1600 (11-11-11-28) RAM (2x4GB + 2x4GB). Awesome that your RAM runs 1600 at stock voltage! I OC-ed mine to 1600 (9-9-9-24 1T) at 1,65V. The maximum voltage DDR3 is rated for is 1.9V (with heatsink). I read online that the max voltage for a non-heatsinked DDR3 RAM module should be 1.7V. My RAM is now stable (Not fully tested but played enough Anno 1800 and BF4 without them showing problems, these games usually find CPU and RAM OC's unstable if they are unstable in the slightest). What I had to do to reach this is up the VTT (memory controller of the CPU) from 1.059 to 1.159v. I read online that the VTT voltage should never be 0.05V lower than your DDR voltage. Since my DDR voltage is 1.65V, VTT should be 1.15V minimum. After doing so, it was and still remains stable I have my 2500K at 4,8Ghz at the moment, although it needs 1.45 - 1.465V to do so. This is on an AsRock Z77 Pro3 motherboard. This board is known to have terrible VRM's so that may be the reason why it needs so much voltage. However, I can run my 2500K at 4,5Ghz at stock voltage with 50% LLC. For the 4,8Ghz I need 0% LLC (which is the highest form of LLC possible, weird way to name it I know...) Oh and bytheway, the board is also missing 6 CPU pins. Dual channel RAM is no problem and I even had the damn thing running at 5Ghz (at 1.465 - 1.475V). However I do not like this high voltage for 24/7 use so turned it down to 4.8Ghz. I did need to combine 2 PSU's to do this as I have a R9 290 which uses 300W at full power, and together with all of the OC's, the PSU simply could not keep up. Now I have the 600W for the GPU whilst the 550W is for the RAM and CPU and the rest. I can be more specific if you'd like, but not sure if you are still actively using this forum/post as reference. Let me know, maybe I can help u reach a higher OC
