CPU voltage ?
CPU voltage ?
Hello.
I'm using an AMD FX-6300 CPU with an ASRock 960GC-GS motherboard.
I'm attempting to apply a manual voltage setting, but I noticed something odd from HWmonitor: the drawn voltage drops when the CPU is under load and rises when idle. I expected the opposite—like the article I read on lower power states explains.
I'm also checking if my budget motherboard might be limiting this behavior or if I'm misinterpreting something.
My BIOS currently has AMD Cool and Quiet with C-states enabled (default).
Based on my manual voltage of 1.2v, I see 1.19v at rest and 1.10v under load (encoding video at 95% CPU utilization).
Thanks for any help!
According to HWmonitor, what does HWInfo indicate? I’m not sure if it’s a budget motherboard issue. It seems likely because the VRM design isn’t ideal and your platform isn’t very recent, which could cause the VRM to overheat and reduce power output. This would be a good read. AMD FX 6300 voltage issue Hello, I’m new here. I’ve overclocked my FX 6300 to 4 GHz and tested it for 45 minutes on prime95 without any issues. The unusual part was the voltage readings. My original voltage was 1.15 V (very low, typical for FX 6300: 1.35 V). So I increased it to 1.24 V (still...). forums. Additionally, even if your motherboard claims support for 95W processor parts, the VRM area might indicate otherwise.
This is typically built into the processor design. For more details, check "V Droop" at the provided link.
Upper mid and high-end motherboards often include an option for LLC or line load calibration to help counteract overclocking and maintain stable voltages.
You don't begin with a higher voltage expecting it to remain steady; instead, you can reduce the voltage and the LLC feature will limit droop based on the setting.
Lutfij
,
You're correct, HWinfo provides entirely different data, as shown by these images indicating around 0.9v at rest and 1.5v under load.
Unolocogringo
,
thank you for sharing this information—I wasn't aware of it before.
In general, the CPU warms up too rapidly, causing the PC to shut down after about 5 minutes while encoding video, especially when the CPU voltage/multiplier is set to auto.
However, adjusting the voltage manually (similar to what I did with an older FX 4300 on this same board) helps maintain stable temperatures and keeps them within a safe range.
I also have another vintage motherboard (Gigabyte GA-78LMT-USB3, revision 6.0) in storage; I haven't tested it yet, but I think it might perform better.
It’s likely your budget board’s constraints are the cause. Under heavy use, a cheap voltage regulator struggles to maintain the required voltage for the CPU, leading to instability or shutdown. More demanding CPUs, especially those with many cores like the 6-core 6300, tend to perform worse when under stress. Better designs often use LLC or Load-Line Calibration to stabilize voltage during increased load, though this can introduce risks such as sudden voltage spikes that may damage the CPU over time. These issues were usually handled by experienced overclockers who used them carefully.
This suggests you've used excessive manual voltage, though my next point is worth noting. I usually pair larger coolers with most of my CPUs and keep stock ones in the box. It can feel a bit excessive, but with a TDP of 95W or more, bigger cooling solutions bring more satisfaction.
I own an older AM3 3.4GHz AMD 965 Phenom II X4 and a 3.2GHz 955 model, both three years newer than your FX6300. The Phenoms start to fail above +60°C. This makes overclocking difficult even with large heatsinks. My 3800X (NH-D14) and 7950X (NH-D15) experience thermal throttling at +95°C, though they don’t crash.
I found a reference to a temperature of +70.5°C for the FX6300 in CPU World, but I’m uncertain whether this refers to the maximum CPU die temp or the max socket temp. Either way, you might achieve higher speeds with a larger heatsink on the 6300.
https://www.cpu-world.com/CPUs/Bulldozer/AMD-FX-Series FX-6300.html
Please note there’s some debate about the accuracy of socket temperature readings in such discussions. I’m unsure if the 6300 includes a built-in sensor on the die or depends on an external diode under the socket.
https://www.techpowerup.com/forums/threa...ps.190250/
It’s worth mentioning that many motherboards apply too much voltage to CPUs (both Intel and AMD), particularly during overclocking. They’re designed for CPUs that are prone to instability and need a bit more power to stay steady.
From your screenshots, you were running at 1402.9MHz at 0.825V when idle and 3507.2MHz at 1.55V, likely with all four cores near full load. Such voltage ranges are typical. The BIOS automatically adjusts voltage as frequency changes.
The 6300 should raise two cores to 3800MHz or one core to 4100MHz, but at much lower voltages than the 1.55V shown in your image—around 1.425V and 1.4125V. BIOS variations could explain this.
Frequency
?
3.5 GHz / 3500 MHz
Maximum turbo frequency
4.1 GHz / 4100 MHz
Boosted P states^M
#1: 4100 MHz, 1.425V
#2: 3800 MHz, 1.4125V
I’m trying to figure out where your 1.55V fits in with your manual setting of 1.20V. It seems your screen shots were taken with the BIOS set to Auto.
Be careful with manual voltage adjustments. Going beyond 0.3V above the safe level could cause smoke and a dead CPU.
From this thread on Tom’s site, someone was using around 1.5V while aiming for 4.8GHz—this is what I call pushing the limits, unless you’re cooling with liquid nitrogen or helium. You risk damaging your CPU with excessive manual overvoltage.
1.20V feels low for a stable all-core overclock at 4.00GHz, but if your CPU overheats after just five minutes of video editing, adjustments are needed. Either lower the voltage or improve cooling.
I recommend a high-end AM3 air cooler or a mid-range AIO, if you can find one that fits such an old processor.
I don’t know how effective this inexpensive 6-heatpipe cooler is, but it’s the kind of solution I use when trying to squeeze out extra heat with large airflow. It might be too much for the 6300, but it includes the necessary AM3 mounting. It may not fit in your build, so check the height clearance and confirm you’re getting an AM3 unit.
https://www.amazon.com/upHere-Cooler-Pip...B0CRDX9F1V
On the other side is a twin heatpipe cooler rated at only 95W, which isn’t suitable for an overclocked 6300.
https://www.amazon.com/SilverStone-Techn...B07GN1C3G5
It looks like your regular AM3 cooler is struggling with the overclocked 6300. Consider getting the largest possible cooler that fits. My Phenoms use outdated Noctua air coolers (single tower, single fan), which are not cheap.
I’d suggest at least four heatpipes—ideally six. More heatpipes, two large towers plus two 120mm/140mm fans often perform better than one small tower with a 90mm fan.
Here’s a revised version of your text:
I wanted to address a few points you mentioned. When I described the PC crashing due to CPU overheating after just five minutes of video encoding, it occurred when the BIOS voltage was set to AUTO. The HWinfo displays the Vcore in real time, showing recorded minimum and maximum values. With the CPU configured for auto voltage (no overclocking), I observe a range of 1.32V during load and 1.25V during idle. If I switch to manual voltage, the system suggests 1.15V. Using that setting gives a range of approximately 1.10 to 1.15 for load versus idle. This is quite different from the Vcore readings when AUTO is enabled. The other voltages referenced earlier appear to be fixed P-state voltages, as shown in the CPU-Z report:
P-State FID 0x19 - VID 0x11 - IDD 17 (20.50x - 1.337 V)
P-State FID 0x16 - VID 0x18 - IDD 17 (19.00x - 1.250 V)
P-State FID 0x13 - VID 0x20 - IDD 12 (17.50x - 1.150 V)
P-State FID 0xE - VID 0x26 - IDD 9 (15.00x - 1.075 V)
P-State FID 0x9 - VID 0x2C - IDD 7 (12.50x - 1.000 V)
P-State FID 0x4 - VID 0x32 - IDD 6 (10.00x - 0.925 V)
P-State FID 0x10C - VID 0x3A - IDD 4 (7.00x - 0.825 V)
I’m not sure how this relates to adjusting the Vcore in the BIOS. Based on HWinfo, the CPU’s requested voltage matches the P-states, but it doesn’t necessarily reflect the actual voltage supplied by the regulator. For now, I’m manually setting the voltage to 1.15V, as recommended by the BIOS, and will monitor the results. During my video encoding test, the performance remained stable with temperatures well under 60°C.
drea.drechsler - thanks for providing this additional insight.
these chips require a high-performance cooler, but it doesn't suffice when pushed to maximum capacity. even then, these cpus aren't the top choice because windows doesn't recognize them as genuine 6-core processors due to resource sharing, and they often exhibit core parking issues.