You can under volt a Core 2 Santa Rosa chip under vista

Using the new rightmark cpu clock utility, I can undervolt my T7300 to .950 volts under full load at 2.0GHZ. Reduced my Full load temps by around 12-15C. Also by adding some AS5 soon, I should see an even further drop. I did a brief 5 hour test with Prime 95 and everything seemed fine. Will do more extensive testing this weekend.

 

nice! i havent tried getting my T7200 to run at 2ghz on 0.950V but might try it!

 

I've never undervolted a processor before, but I'm very interested in undervolting my laptop when it comes in. I have the T7700 2.4Ghz Core 2 Duo which will be running in Vista Ultimate 64-bit. Any tips or tricks you can give me in regards to undervolting would be greatly appreciated!

 

I'd love to do the same!!! Please post how.

 

Guys stay tuned as I will be posting a guide. Step by step.

 

Cool - idea...I am going to wait on your guide to see if I configured mine the same way...If I did this correctly, I am idling around 43-44 degrees at my full 1.8 ghz processor speed.

--Mickey

 

Is there a way to 'hack' the range of possible voltage values to set it below what's available?

 

newbie question - what does under volt mean and why would you want to do that?

 

That's great news. I'll be waiting.

 

Running your CPU (or other components, but in this case only CPU) at a voltage under the rated/recommended/default voltage. Doing this saves power, which in turn reduces heat output and prolongs battery life. It's like seeking greater efficiency.

 

So why wouldnt HP do this from the get-go? There must be a reason not to otherwise it seems like a no brainer...

 

Do manufacturers overclock anything? Nope, and people do it safely all the time. It's like putting a cold air intake and better exhaust on a car, whey didn't the manufacturers to it? Its cheaper for them to make it stock, involves less time and money for them.

 

ah great, im looking forward to this guide aswell

 

me too...can't wait for the guide

 

also, undervolting sometimes leaves your notebook unstable, which is why you have to experiment with the settings, or just follow an upcoming guide

can't wait for it.

 

I do not suggest running at 2.0GHz with only 0.950v. This processor is designed to run at 1.3v. You're sacrificing system stability for a bit of heat and battery life.

To test, run at 0.950v and then load up both cores with instances of prime95 or SP2004 (even more harsh on the cpu). It will either give you a rounding error, or will reboot your system.

If you want to run 0.950v, it's much better to tell RMClock to scale back to a 6x multiplier. On battery, tell it to stay in the low multipliers so that you still get the extra battery life advantages. On AC, either use performance on demand (allowing it to freely switch between 6x and 10x from the range 0.950v to 1.3v) so that you get the extra lack-of-excess-heat advantages, or disable management and let it do its own thing.

 

sordid, I have a quick question. I was using RMclock last night and was messing around with undervolting the CPU and since you use it you might be able to answer my question. After I go to the profile tab and set the voltage I go into the individual profile and select the p-state transmission (PST), but I can only check one of the multipliers, I can't check all of them. So basically whatever multiplier I check it will only run at that speed. Is it because I'm using the demo? and if I buy the full version I'll be able to check all of them?

The sad thing for my undervolting is that I can only go down to 1.050V, I have the Santa Rosa Core 2 Duo T7700 (2.4Ghz).

Thanks in advance!

 

What power profile did you select. If you selected Power saving or maximal performance then you can only select one multiplier. IF you select Performance on demand then yo can select any number of multipliers to run.

 

That is probably it because I was using the performance profile tab. I will give this a try when I get home. Also, for anybody that might know, does the Santa Rosa Core 2 Duo T7700 (2.4Ghz) processor have a lock at the 1.050V? because I can't seem to go below that.

Thanks again!

 

In performance profile, yeah, you can only select one p-state transition, which makes sense.

Each processor has a "valid" VID range. The T7300 dips to a low of 0.937v, and since the 2.4 T7700 is faster and most likely has a higher top VID, the lowest one will be adjusted accordingly. You generally don't want to go below that, but it could be possible through other means.. just not with RMClock's basic interface. (read: you may have to get your hands dirty)

 

I definitely don't mind getting my hands dirty when it comes to computers. I'll look around for the dirty version of undervolting and give it a try.

 

Ok, I have been in the middle of undervolting my Core 2 Duo Santa Rosa T7700 (2.4Ghz) on my DV9500t with Vista Ultimate 64-bit and I will be posting my findings shortly and steps to do it. I have found the right voltages and just need to run long term tests for stability. I will also post the average temperature for each voltage setting as well.