Core i5 Overclocking and Feedback

[Grnfinger]

just out of curiosity is anyone running Ripjaws 16000-CL9D kit?

If so are you having trouble getting them to 2000MHz on a overclock, I can run them at 2000MHz and pass memtest but once into windows prime fails instantly.

GSkill forums are well ... not very helpfull the rep suggested to run 17x167BCLK and I would be able to run the ram at 2000MHz but this is not an acceptable soloution seeing as I run 21x200BCLK, just wondering if anyone else is having the same issue with the ram or have I got the special kit

[sneekypeet]

Has anyone really messed with undervolting these i5 750's?

I got to my stock ram speed (1600 CAS7) and with a stock cooler I wasnt too fond of the 75 degree temps I was getting in OCCT. So I dropped the voltage. Currently just at a 160 bus speed, so I get 3.2Ghz on the CPU.

Question is how low can these go? Currently passing OCCT at 1.07V, still trying.

[unclewebb]

sneekypeet: I haven't seen a lot of people playing around with enabling C3/C6 and letting the CPU use its highest multiplier. An i5-750 can use a 24X multi when 1 or 2 cores are in the active state and the other 2 cores are inactive in the C3/C6 sleep state.

The majority of tasks people do on a computer only use 1 or maybe 2 cores on a good day so I think for 24/7 use, this might be a better way to go. You'd be able to keep the volts and the heat down while still getting great performance for the majority of tasks you do.

RealTemp shows the average multiplier on the hardest working core. If you want to play around with this, enable C3/C6 and then run a single threaded bench mark like SuperPI Mod and you should see you multi averaging around 23.7 during this benchmark if you don't have too much background activity dragging it down.

A lot of games, etc. are mostly using 1 or 2 threads so I think this might be a good option, especially when you're only using the OEM cooler. You can run a RealTemp log while gaming and then go back and see what the multi / MHz were at during the game. The higher the average multi, the less threaded the application is.

http://www.fileden.com/files/2008/3/...alTempBeta.zip

i7 Turbo is also included in the above download which is a more precise tool for monitoring the multiplier and you can also log with it.

[sneekypeet]

great info unclewebb, you always seem to come through

Currently I have the majority of everything (C states) off. So I'm essentially running full speed all the time on all 4 cores correct?

Currently in windows in such a state,I am passing OCCT at 1.07V in windows with 1.10V set in bios at 3.2GHz. Good, bad, average?

[Cold Storm]

I guess I can join?

EVGA P55 FTW
I5 750
2x2 Trident 2000mhz

Right now, just toying since it's not in it's water loop..

[unclewebb]

Originally Posted by sneekypeet

Currently I have the majority of everything (C states) off. So I'm essentially running full speed all the time on all 4 cores correct?

You should be running at full speed but it's always good to check with i7 Turbo. There can be situations where you think you have something turned off in the bios but in reality, when you get into Windows, you don't.

If EIST is enabled in the bios there is usually a setting in the Control Panel -> Power Options called Minimum processor state. This setting can override other settings so if you want your full multiplier at idle, make sure that is set to 100% and C1E is disabled. Some boards have an option to turn EIST off in the bios but often times it doesn't work and by design on many boards, I think EIST is supposed to be left enabled for turbo mode to work correctly.

A stable 3.2 GHz at 1.07 actual volts sounds good to me.

I find that the capabilities of these processors to turbo up to a much higher multiplier is rarely being used. To get the 24 multiplier, you need to enable C3/C6. Most users disable stuff like this immediately without realizing what they just did.

Intel has made life easy for noobies that are scared to overclock. All you have to do is enable C3/C6 and when only 1 or 2 cores are active, an i5-750 is already running at 24 x 133 = 3.2 GHz. You're not overclocking the BCLK so you can leave everything in the bios set to AUTO including the core voltage. I've seen more than one user that doesn't want to overclock but doesn't even know this simple overclocking feature exists and is Intel approved as well. No voiding the warranty.

Your way running 3.2 GHz full time will give you better overall performance but for most tasks, there probably won't be much noticeable difference. I just wanted to introduce the beginners to some easy and free extra MHz without having to think too hard and for the old timers to do some testing to see if this is a usable Intel feature or is a feature more for the PR department to brag about.

[sneekypeet]

again a big thanks.

I did notice what they were all doing, and had surfed most of the threads prior to tinkering. Now if I could get rid of this ungodly shitty stock cooler

Oh and I'm leaning towards PR

[hayder.master]

Originally Posted by unclewebb

Sorry hayder.master, there is no documented way to read VID from a Core i5 CPU.

If there was something in the Intel documentation to show me how to do this I would have done it yesterday. If it's possible, Intel is not willing to share that secret.

thanx a lot my dear friend i am very grateful