vandassen

Ok here's my numbers:

fsb - 1466
memory speed - 800
mem ratio - 797 (cpuz gives me 11:12 fsb:dram)
multi - 10.5
effective OC - 366.7 x 10.5 = 3850mhz stable

Maybe I'll try 1470 fsb to get a nice 800:800 ratio and check if stable

cpu v - (1.1v base) + (0.0 - 0.3) currently +0.275 gives me 1.368 on cpuz
mem v - 1.9
VTT fsb v - 1.2
nb v - 1.24
sb v - 1.5

Just wondering how to hit that 3.92 stable or even higher. heat doesn't seem to be an issue at all I think I have a super chip.

What's the headroom like for OCing my ram? any opinions on Corsair XMS2 Twinx 6400? 1.9v, 5-5-5-18

TwoCables

By the way, it's VTT.

Anyway, regarding the memory: since you have an nForce 750i, my best advice is to manually set the memory to the stock settings that are printed on the stickers that are located on your memory sticks. If there are no stickers, then you might also be able to find this information in the Timings Table on CPU-Z's SPD tab. For example, here's mine:



I started with the values in the far-right column. I just memorized them, rebooted into the BIOS, and then manually set everything. And then I began tweaking. And based on what I was taught - and I found this to be 100% true from experimentation - it's best to get the tightest timings absolutely possible while leaving the clock at stock because I have an nForce chipset. I was also taught that I should shoot for a 1T Command Rate instead of 2T, and so I did that too. Here's the end result:



The voltage is 2.175V in BIOS, and Everest Ultimate Edition 4.60 says it is 2.181V. When I switched to 1T, I had to loosen the CAS# Latency (CL) from 4 down to 5. I also had to boost the voltage from 2.05V to 2.1. And then I found I needed a little more, so then I put it up to 2.125, and then I eventually settled on 2.150V. However, then I learned that I could lower my core voltage a bit by raising my memory voltage. So, since I have a top exhaust fan in my case that's directly above my memory, I was fine with this, and bumped it up to 2.175V. The end result is rock-solid stability for all the testing that I have ever put this overclock through. It's amazingly stable.

Now, as you can see, it's still at 800 MHz (400 MHz). Before I learned what I learned about tweaking my memory, I previously had my overclock at 953 MHz, 4-4-4-12-2T using 2.1V. It was stable, but to be honest with you, I didn't notice a single bit of difference between 800 MHz and 953. So, I figured that I would notice it somewhere else. And if not, then I figured perhaps I wasn't noticing because I just didn't know what to look for. HOWEVER, once I tried this memory tweak, I instantly noticed a performance increase. It wasn't huge, but it was certainly noticeable and I certainly enjoyed it (but now I'm used to it).

So, if your system can tolerate the change from 2T to 1T, then you'll notice it too. And it's definitely worth the time and effort to get it stable. All you have to do is make it stable enough to pass like 5-10 passes in Memtest (one pass is when it completes all 8 of its tests one time), and then like 6-12 hours of the Blend test. But for the CPU overclock: that needs about 12 hours of the Small FFTs test to be called stable (so that you don't run into problems later on down the road due to instability).

For the Small FFTs and Blend test, just use Orthos. There's no reason to use Prime95 because Orthos is Prime95, but with a different GUI.

So, to summarize, don't increase the memory clocks, but instead, get the tightest timings possible while also going for 1T. But if you had an Intel chipset, then you would have to go for the biggest memory clock with temporarily loose timings only to tighten those timings down on top of the overclock once you're finished.

Oh, and fill in your system specs so that they automatically show up in your signature. To do that, do this:

1. Click on "User CP" on the black bar at the top.
2. Click "Edit System" on the left
3. When finished, click Save Changes at the bottom.

After that, it will appear in your signature just like it does for everyone else.

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vandassen

This is fantastic I can't thank you enough. certainly gives me more insight into a few new areas. I'm gonna go mess around and see where it leads me.

Unfortunately I can not load my screenshots, but my cpuz values are (under the SPD tab):

270mhz 4.0-4-4-13-15 1.8v

&

400mhz 5.0-5-5-18-22 1.8v

Currently set to (memory tab):

400mhz 5.0-5-5-18-22 2T 1.9v

but everything I've read says 5-5-5-18 1.9v...what's cpuz talkin about? Also, I do not have the EPP#1 column that you have...

will post results in a bit

GigaByte

Drop the PLL or that CPU is going to die.

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TwoCables

Regarding posting screenshots, please see this other thread. I'd re-type it, but I already took up a ton of thread space in this thread.

E7400... Quest for 4.0

That points you directly to my post where I included the little - err big - tutorial. The tutorial begins right after the two links that I posted.

Anyway, I confess that I'm really confused as to what you mean when you said "but everything I've read says 5-5-5-18 1.9v...what's cpuz talkin about?". I mean, is that what it says in one of the columns on the Timings Table on the SPD tab? I mean, I know that CPU-Z doesn't report the current memory voltage, so that's why I'm confused.

Anyway, regarding EPP#1: meh, it's nothin' really. That's because my memroy is SLI-Ready memory. This means that I can enable that feature in the BIOS and not have to worry about tweaking my memory because it's done for me. In other words, it's basically for newbies and it's also for people who don't know enough to come to a message board like Overclock.net for help. lol

But still, I have noticed that the "best" settings seem to always be listed in the far-right column whenever there are multiple settings. To be honest, I don't yet know why anyone would use the other settings. But there has to be a very good reason.

Anyway, I hope that my cheesy tutorial helps you successfully attach pics.
Whoa, I don't know how I missed that. I agree. The PLL should be dropped down to like 1.6V or lower. But I'm guessing based on what I have recently learned (you might say that I'm practicing here).

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CL3P20

'moar vcore' is more like it... You shouldnt need much moar than ~1.37v FSB/VTT. You will need ~1.4vcore to push much past 4ghz though, unless you have a really stellar CPU [which there arent many of as far as e7400's are concerned ]

I needed 1.41vcore and 1.35VTT for my E7400 to hold 4ghz stable at 400*10 or at 472*8.5 ...and 1.48vcore for 4.44ghz

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vandassen

What's the PLL?

vandassen

Hey

ok so, my timing tables in cpuz say 1.8 but my bios is set to 1.9 and all the specs say 1.9, so what's the timing table suggesting?

one other thing, I'm confused. did you say that I can stray from the settings on the timing tables to try and tighten them up? or do I stick with the settings in the right column religiously?

btw I bumped to 1T and noticed it. everything else is still stock for memory. please tell me what the PLL is so I can drop it asap

I'm going to try to push 3.9 as I cannot exceed 1.392 vcore. not sure I'll ever hit 4.0 with those limitations...

thanks guys

TwoCables

We meant that Elev8rSh0es needs to drop his PLL. But, I don't know if your motherboard has a PLL voltage adjustment. And besides, if you don't know what it is yet, then you either haven't adjusted it yet, or it doesn't have an adjustment for it. So in either case, your rig is definitely safe in that department.

Regarding the Timings Table: that will never change because it's information that you can use, but it's not telling you what the memory is set to. It's just SPD information - whatever that actually means. I just know that it's kinda like pulling out an instruction manual and finding a point saying "here are the settings that you can use in your BIOS".

But regarding whether or not to use the settings in the far-right column only: I don't know the answer, but I think most people on here would say to experiment doing memory benchmarks (such as the benchmarking tool built into Everest Ultimate Edition 4.60) to compare the results. But somebody like me would say to try different settings, and compare the results by just using your computer the way you normally use it. I mean to me, I don't care what a benchmark says. I only care about how fast my system feels. And so I go with what makes it feel the fastest while not using any unsafe settings for my particular hardware.

But, I am happy to see that your system is tolerating 1T so far. That's just awesome since it's always a noticeable improvement!

So anyway, did you say that your motherboard is not allowing you to bring the core voltage above 1.392V? If you set it to 1.392V, then what does CPU-Z say the voltage is? Damn, I hope it's at least 1.362V in CPU-Z. If not, then yeah, that's lame.

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lockdownx1x

Try 1:1 Ram:FSB Ratio.

400x10= 4.00GHz

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