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How many volts does your Core i3 need for 4000MHz?

post #1 of 11
Thread Starter 
I'm kinda new to these 32nm chips; last i7 I had needed upwards of 1.35v for 4.0GHz Prime95 4hr. stable.

I have a Core i3 550 that needs 1.240v to be 4019MHz stable, wondering if this is above average, below average, or just average? All the reviews I'm seeing used Core i3 530s for their testing and I think the 540s, 550s, and 560s are better binned hence better results. I'm using the stock cooler at the moment and temps max out at 65c with HT on, don't really want to push it anymore.

Thanks.
Marisa
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post #2 of 11
I had my 550 up to 4.15GHz on the stock cooler at 1.224v; P95 stable. I'm at 4.5GHz 1.36v now on the H70 and temps are 62*C max.

Most 530's and 540's are C2 stepping whereas all 550's and 560's are K0 stepping. I'm not sure how much different the steppings are, but it may be the difference you're seeing in those reviews.

What are your other BIOS settings?

Mine:
187.5 x 24 = 4.5GHz
Vcore 1.36v (CPU-Z)
VTT 1.254v
PCH-1.8 1.82v
PCH-1.05 1.054v
GPUv 1.312v
RAM 1875 7-9-7-23-1T 1.645v
QPI x18 6732

-----------------------------

180 x 23 = 4.15GHz
Vcore 1.224v (CPU-Z)
VTT 1.248v
PCH-1.8 1.82v
PCH-1.05 1.054v
GPUv 1.312v
RAM 1800 8-9-8-25-1T 1.645v
QPI x18 6480
post #3 of 11
Thread Starter 
everything is at default except bus, cpu volt, and ram which is somewhere around 1333 7-7-7-21

167 bus speed
1.240v
Marisa
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post #4 of 11
my i7 870 needs 1.4v to hold 4.2ghz , is this because of hyperthreading and the extra power the i7 needs ? or do these chips just require voltage that high..
    
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post #5 of 11
Quote:
Originally Posted by Xristo View Post
my i7 870 needs 1.4v to hold 4.2ghz , is this because of hyperthreading and the extra power the i7 needs ? or do these chips just require voltage that high..
Extra cores compared to an i3.

Edit: and as mentioned below by skarm... 45nm vs 32nm
Edited by LethalRise750 - 2/18/11 at 7:22pm
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post #6 of 11
Thread Starter 
Quote:
Originally Posted by Xristo View Post
my i7 870 needs 1.4v to hold 4.2ghz , is this because of hyperthreading and the extra power the i7 needs ? or do these chips just require voltage that high..
probably because 45nm
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post #7 of 11
Quote:
Originally Posted by skarm View Post
everything is at default except bus, cpu volt, and ram which is somewhere around 1333 7-7-7-21

167 bus speed
1.240v
Does default mean auto? If so, then you really have no idea what volts the board is deciding it needs for the given speed.

Try setting them manually to the lowest voltage available (1 tick up from auto) and then work up from there as needed.

You aren't pushing the RAM or uncore hard, but make sure you lower the QPI multi as it can get in the way if it gets much above 3600.

Try lowering the CPU multi at first so you can be sure everything else (RAM, QPI, uncore) is stable at your current BCLK. Run P95, select Blend, but then select Custom so that Custom populates w/ Blend's settings. Then adjust the fft time to 3mins, and set the RAM usage to 4096MB. Running it this way lets you get through all the fft sizes in about 2hrs and runs it hotter than just plain Blend. If you get a failure try tweaking VTT (sometimes less is better for a given speed). Once you get dialed in you can increase the fft time to 7 and eventually 15mins and run it for at least a complete cycle (10hrs or so).

Once you are sure everything else is stable increase the CPU multi back up, and tweak using vcore until stable (follow the same custom P95 settings above).

You might be able to get that speed up a little w/o any extra heat if you tweak on it a bit. But, even if you hit 80*C during P95 you should be fine for everyday operation as these chips clock down and run very cool during normal usage.
post #8 of 11
My i3 530 (C2) needs 1.33Vcore for 4GHz and 1.4Vcore for 4.2GHz.
stock cooler
     
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post #9 of 11
Thread Starter 
Ok, I was able to drop down to 1.232v with the 23x multi as opposed to the 24x resulting in 4039MHz stable 1400MHz DDR3 7-7-7-21 1T 8hrs p95 stable.; isn't there something going on about certain multis not working as well as others?
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post #10 of 11
In general, the odd multi's seem to work better, but every chip is different. I've had many clarkdale chips and your voltage is about average to a little below average. My 540 is a great chip and will run 4ghz at only 1.15v. Try running your qpi at 20x, it should be stable and give you a nice boost in memory performance.
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