CrystalCPUID - any trick to get voltages below 0.8v?

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davidh44
Posts: 54
Joined: Wed Apr 16, 2008 8:51 pm
Location: USA

CrystalCPUID - any trick to get voltages below 0.8v?

Post by davidh44 » Mon May 19, 2008 2:01 pm

I use CrystalCPUID on my Brisbane/Tyler AMD x2 CPUs because RMClock simply isn't stable with them. But CrystalCPUID only goes down to 0.800v. I can get it down to 0.775v by editing the .ini file, but it won't recognize anything lower than that.

Does anyone have a trick to get CrystalCPUID to recognize voltages lower than 0.775v?

kike_1974
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Location: Spain

Post by kike_1974 » Fri May 23, 2008 8:22 am

There is no trick, it is a design limitation. Those programs use VIDs to select voltage (a VID is just a code that is sent to the VRMs to tell them which voltage to use), and these vids are limited.

In fact, the 0.775V that you see in RMClock is just a tag associated to some VID, probably the lowest vid, and probably it doesn't correspond to 0.775V real voltage. It could correspond to the same voltage that the vid that is selected in crystalcpuid with 0.8V.

Just select the mininun possible vid, and check with cpu-z the voltage.

davidh44
Posts: 54
Joined: Wed Apr 16, 2008 8:51 pm
Location: USA

Post by davidh44 » Sun May 25, 2008 7:00 pm

RMClock CAN go below 0.8v. It can run my Tyler-core AMD X2 mobile CPU at 0.65v. It is CrystalCPUID that has 0.8v as its lower limit (or 0.775v if you edit the .ini file).

kike_1974
Posts: 171
Joined: Sun Sep 24, 2006 10:34 am
Location: Spain

Post by kike_1974 » Mon May 26, 2008 4:39 pm

Have you tested if it REALLY changes voltage to 0.65V?

You can try cpu-z to see if voltage changes, or better yet, you can try to measure power consumption before and after changing voltage.

davidh44
Posts: 54
Joined: Wed Apr 16, 2008 8:51 pm
Location: USA

Post by davidh44 » Mon May 26, 2008 11:37 pm

kike_1974 wrote:Have you tested if it REALLY changes voltage to 0.65V?

You can try cpu-z to see if voltage changes, or better yet, you can try to measure power consumption before and after changing voltage.
Yes it does.

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