CPU Voltage Confusion and AMD Overdrive Question

1405 · May 22, 2014

First question:
I have a MSI 785GM-E65 MB with a new (opened the box last week) Phenom II X4 965BE (125W).

I get confused with which voltage to increase for the CPU. There is CPU Voltage, CPU VID, CPU VDD, CPU VDDC, CPU VCore. ?????
I had a stable OC at 4GHZ in AMD Overdrive with the CPU VID at 1.4972, but when I went to make those changes in BIOS, I couldn't find the CPU VID. The only choice I had that allowed for voltages in that range was CPU Voltage (v). Is that the same as CPU VID?

The reason I ask is because after changing that, CPUZ still shows the Core Voltage as 1.464 and HWMonitor has the CPU Vcore at the same thing, 1.464. I'm confused.

Next question:
Is there any way to save the changes made in AMD Overdrive so they don't disappear with the next boot?

damric · May 22, 2014

AMD Overdrive doesn't take into account voltage droop. What you are seeing in CPU-Z is after the voltage droop. Voltage droop is not necessarily a bad thing but you need to be aware of it when you are dialing in your settings in the BIOS and compensate as needed.

There is a way to make AMD Overdrive settings apply every time you boot but I do not recommend that. It's better to dial your stable settings into your BIOS. AMD Overdrive is great for monitoring and for real-time tweaking.

VID same as Vcore on that mobo. Be careful about pushing a heavy overclock, as that board doesn't have the best of thermal handling.

1405 · May 23, 2014

Thank you for the reply. In that case I'll just use Overdrive for obtaining the final settings I want and then transfer them to BIOS.

You say VID is the same as Vcore. But my BIOS doesn't have either. All I can find are the following voltage adjustments:

CPU VDD Voltage (V)
CPU-NB VDD Voltage (V)
CPU Voltage (V)
CPU-NB Voltage (V)
DRAM Voltage (V)
SB Voltage (V)
NB Voltage (V)
HT Lnk Voltage (V)

I made the VID voltage adjustment to CPU Voltage (V), and so far it is stable @ 4GHZ. I've run the default 10 run pass with Intel Burn Test, AMD Overdrive's 1 hour stability test, several 3DMark benchmark runs, and am now running Prime95. I hope I picked the right one of the settings to change.

damric · May 23, 2014

Basicly one is the VID and one is the offset. As long as it works, it doesn't really matter. I'm guessing you are overclocking, so you might want to give this handy pdf a read:

http://sites.amd.com/us/Documents/AMD_Dragon_AM3_AM2_Performance_Tuning_Guide.pdf

CPU-NB tuning really helps those Phenom IIs with latency. You'll have to do that in the BIOS though.

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CPU Voltage Confusion and AMD Overdrive Question

1405

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damric

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1405

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damric

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