Pro/Forums - View Single Post - What do you think of this Vcore stabilizer?

GigaFrog · 02-17-2002, 01:52 AM

To catch the fluctuations that may appear on your Vcore line, you need a very good scope. I borrowed a Tektronix 400MHz digital scope from work. The scope would trigger down to 1.95V, and up to 2.23V.

Some of the shots are taking in DC voltage. They show the true voltage values, but lack of definitions, because of the higher scale required. For more definitions, I also took AC plots, but you don't get true voltage values with that, only the variations from average.

Here are the shots:
Vcore during boot (DC)

Same as above (AC) better definition, faster time scale

Vcore at iddle (AC) 2.23V overshoot

Vcore under load (DC) 1.95V undershoot

Fluctuations due to PWM regulation (DC)

Same as above (AC) better definition

And this last one was a surprise. It happened during a hard-drive access.
Effect of a HDD access on Vcore
When I saw that, I put electrolytic capacitors on the molex that connects to the HDD. I had crashes during HDD access in the past. Now I understand why!

Hope these pics will show up correctly!

02-17-2002, 01:52 AM	#9
GigaFrog Cooling Neophyte Join Date: Nov 2001 Location: NorthWest (French & US) Posts: 88	To catch the fluctuations that may appear on your Vcore line, you need a very good scope. I borrowed a Tektronix 400MHz digital scope from work. The scope would trigger down to 1.95V, and up to 2.23V. Some of the shots are taking in DC voltage. They show the true voltage values, but lack of definitions, because of the higher scale required. For more definitions, I also took AC plots, but you don't get true voltage values with that, only the variations from average. Here are the shots: Vcore during boot (DC) Same as above (AC) better definition, faster time scale Vcore at iddle (AC) 2.23V overshoot Vcore under load (DC) 1.95V undershoot Fluctuations due to PWM regulation (DC) Same as above (AC) better definition And this last one was a surprise. It happened during a hard-drive access. Effect of a HDD access on Vcore When I saw that, I put electrolytic capacitors on the molex that connects to the HDD. I had crashes during HDD access in the past. Now I understand why! Hope these pics will show up correctly! __________________ Got water? Water cooled for 3 years. Safe with thermal switch. Now silent with fan thermostat.