i5 6400 BCLK overclocking Vcore Vid problem
i5 6400 BCLK overclocking Vcore Vid problem
Hi guys, I have a question. I'm doing BCLK overclocking and have set the LLC to level 2 (AsRock motherboard), with Vcore at 1.27v. It worked perfectly. Then I lowered it to 1.23v and still functioned fine. Eventually, I reduced it to 1.20v and there were no issues, though performance dropped noticeably during Prime95 tests. This was only done because my VID is 1.06v. When I overclock at 3770k, Vcore is 1.25v and VID is 1.22v. Based on this, shouldn't I aim for a Vcore of 1.10v for a 6400 BCLK? It seems like an unusually low setting for that clock speed, so I'd appreciate advice from someone with experience. Thanks in advance!
The video signal voltage that the CPU asks for from the VRMs is what I'm referring to. It might only matter during stock clocks, but I'm not entirely certain. Still, I don't see a clear fixed connection between VID and Vcore that I'm aware of.
It would be due to two primary factors.
a) The Skylake offers better power efficiency, aligning with Intel's goal of lowering power use and enhancing heat management as per Moore's law.
b) You're using an i5, which is a less powerful processor with only four logical cores, reducing system strain.
Multipack :
It'd say it because of two main reasons.
a) the Skylake is more power efficient (Intel's aim for a few gens has been to reduce power consumption and improve thermal distribution as Moore's law grinds to a halt)
b) You're dealing with an i5. It is a less powerful chip and only has four logical cores so doesnt strain the system as much.
Your VID seems pretty normal, and all it shows is just how overclockable that chip is. It's basically a locked 6600k. What do you have the baseclock set to?
I think Moore's Law lost its function a long time ago. I set my BCLK from 160 to 155, and increased my RAM from 2600-ish to 2800-ish. Actually I just met a bluescreen crash when opening Chrome tabs to check your reply, and now it has been adjusted to 1.175v Vcore. I will see if it works or not, but still, comparing to 3770k, this is such a breeze. With a deepcool maxx 300 cooler in my ITX built, prime95 v28.7 8k heat test is only 50c in standard mode, instead of performance mode fan settings.
I decided to jump to z170+6400 after reading some BCLK oc threads, and now I am so so happy about my decision. It has 4 cores with only 4 threads, but it performs 80% of stock 6700k. My 3770k @4.6GHz can only do 95% of stock 6700k, and both are fast enough.
I haven't seen anyone mentioning the Vcore-Vid so I created this thread as a reference. Thanks for replying and I think I have found (or will eventually find) the lowest Vcore for my 6400 oc @155 BCLK.
The video signal voltage that the CPU asks for from the VRMs is the nominal voltage. It might only matter at certain clock speeds, but I'm not entirely confident. There doesn't seem to be a clear fixed connection between VID and Vcore that I'm aware of.
TJ Hooker:
VID is the voltage the CPU asks for from the VRMs. It might only matter at stock clocks, but I'm not certain. Still, there doesn't seem to be a fixed link between VID and Vcore that I understand. When overclocking 3770k, VID changes with frequency adjustments. You're probably right about VCORE and VID being unrelated, at least from what I know.
VID keeps shifting when you increase the overclock? That’s understandable. It seems the CPU might be adjusting the VID to achieve the Vcore you specified. For example, if you aim for a 1.1 V Vcore, but the VRMs aren’t ideal, the CPU may settle on a VID that gives a voltage near 1.1 V. Still uncertain, but it makes sense.
TJ Hooker:
VID changes when you overclock? That's understandable. If that's the case, it seems the CPU is adjusting the VID to achieve a Vcore matching your settings. For example, if you set a 1.1 V Vcore, the VRMs might not be precise enough, so the CPU will pick a VID that gives a voltage close to 1.1 V. This is just an educated guess. I mentioned a multiplier of 3770k instead of BCLK, and the VID changes only slightly—around 0.1v. That means the BCLK OC could vary. When I looked up an ASUS motherboard guide for 3770k OC, it showed the actual VID used by the CPU, the Vcore is the PSU's support voltage, and the offset between them depends on the CPU and speed. I'm not an expert, which is why I was surprised to see 6400 at different speeds using the same VID. It might be BCLK OC, but it would be good to share this so someone knowledgeable can help.
VID is the voltage the CPU requests. vCore is the voltage the motherboard (not PSU) provides. Line load calibration accounts for the vDroop when the CPU is put under load when using fixed voltgaes. There is a direct and immediate correlation between VID and vCore.
The lower the 12v supply the CPU needs, the lower the VID is. It's simple. Whether you OC via BLCK, FSB or multiplier makes no difference to the fact an overclocked chip requires a higher load. When the CPU (VID) exceeds the manually fixed voltage (vCore) the offsetted load line calibrates the voltage adaptively, much the same as Auto voltage, but with less freedom to overvolt as it wishes.
MicGGGGG :
The actual voltage the CPU uses is called VID, while the PSU's support voltage for the CPU is Vcore. The difference, offset, comes from Vcore minus VID, which can vary based on the CPU and its frequency. I wasn't an expert, so seeing 6400 at various frequencies with the same VID surprised me. It might be related to BCLK OC, but it would be good if someone with more knowledge could help clarify this.
The PSU gives a steady 12V to the VRMs on the motherboard. These then reduce the voltage to about 1V for the CPU. That's what I understand.
It seems the relationship between VID and vCore isn't fixed, and the non-K OC part might also play a role.