Dual IDA ... FTW

thread here:
http://forum.notebookreview.com/lenovo-ibm/566213-first-lenovo-t61-running-dial-ida-would-mine.html

 

Congrats

 

All good as long as you have a BIOS that can disable EIST.

 

Excuse my ignorance, but what is Dual IDA, and what is the big deal with it?

 

wonder as well.

 

A free overclock. Most CPU's are locked at their frequency. With EIST, if the CPU supports it, when one thread is running and the other is idle the one core can go up 0.5 on the multiplier above stock. So a 2.26 GHz core will run at 2.4 GHz on the one core. If you disable EIST then you can enable IDA on both cores so that the 2.26 GHz CPU runs on both cores at 2.4 GHz all the time............

 

The overclock gain is 5-13%. Depends on CPU and FSB.

For instance, on a T9300 (2.5ghz), you gain 2 extra multipliers; 13, 13.5.
FSB = 200mhz. 13.5multiplier x 200FSB =2.7Ghz. A 8% gain.

Or on a T9550(2.66ghz), you gain 1 extra multiplier; 10.5.
FSB=266Mhz. 10.5 x 266 = 2.8Ghz. A 5% gain.

 

Won't this produce more heat and make your laptop overall run warmer? I'm not even mention the loss of battery life when running on battery.

 

No, since there's no gain in power draw or increase in voltage. You're just using the CPU's available voltage. In fact, I have mine undervolted at max multiplier using ThrottleStop. See in the pic above where it says "VID?" You can use that to increase or decrease the voltage supplied to the CPU at that multiplier. Use Intel Burn Test to test if you have gone too low for stability.

And there wouldn't be any loss in battery life either in you set a battery profile in ThrottleStop to disengage the use of Dual IDA. With ThrottleStop, you can also set SLFM mode.

 

I see. I've asked this in ThrottleStop therad also, but I've have my CPU at 11x now. What I've wonder, is that the max my CPU can go up? Also, there isin't any way to incrase FSB in ThrottleStop, correct?

I'm currently stuck at 11.00 x 266.0 MHz = 2926.3 MHz