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OC on an x4 640

post #1 of 17
Thread Starter 
Hi

I have had the above processor stable at 3.4ghz now for a while on an ASUS m4a87en/usb3 board. Not an impressive oc but it was good enough without me have too high a vcore. As I am learning more and more about ocing though, I have more questions. I have uploaded a picture of my bios screen. I am looking improve the ram freq as it is rated at 1600mhz and then improve on the current timings of 7-8-7-24. Also someone suggested raising the NB freq but wanted to get a bit of advice. What about the HT freq?



I will be going to water soon so maybe I will attempt 3.6 again then but doing this will help me understand more!

Thanks in advance for any help.
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post #2 of 17
Quote:
Originally Posted by skaboy607 View Post

I am looking improve the ram freq as it is rated at 1600mhz and then improve on the current timings of 7-8-7-24.
Is your ram rated at 1.65v? I know some gskill variations are and some aren't. Improving your timings before finding a stable cpu OC could add unneeded complication to finding a high stable OC. I would suggest setting your timings to 9-9-9-27(or 24) and 2t to see if you can achieve 3.6ghz comfortable within your heat limits. This will allow you to use less voltage to the cpu likely. Then once you are happy there Start working the timings down 8-8-8-24, 7-8-7-24, 7-7-7-24.

Quote:
Originally Posted by skaboy607 View Post
Also someone suggested raising the NB freq but wanted to get a bit of advice.
You can go as high as you want on the NB without endangering anything its just a matter of what is stable. At Stock it is at 2000mhz. While trying to find the optimum CPU OC, I would keep it as close to that as possible, then when you are happy with the cpu OC, raise it up 1 multiplier and check for stability, then another until you are no longer stable. A higher NB freq will usually net more performance gain than tighter ram timings.

Quote:
Originally Posted by skaboy607 View Post
What about the HT freq?
Irrelevant. Leave it as close to 2000mhz as possible. Someone on here ran tests in 3dmark taking the HT from 1000 to like 2400 at 100mhz intervals and it made almost no difference in the 3d mark scores all the way up.

Here is the test
Edited by cook - 8/17/11 at 8:20am
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post #3 of 17
Thread Starter 
Quote:
Originally Posted by cook View Post
Is your ram rated at 1.65v? I know some gskill variations are and some aren't. Improving your timings before finding a stable cpu OC could add unneeded complication to finding a high stable OC. I would suggest setting your timings to 9-9-9-27(or 24) and 2t to see if you can achieve 3.6ghz comfortable within your heat limits. This will allow you to use less voltage to the cpu likely. Then once you are happy there Start working the timings down 8-8-8-24, 7-8-7-24, 7-7-7-24.
Yes definitely is rated at 1.65V. Checked before applying it. I did relax the timings when trying to hit 3.6 but still the temps were too high.


Quote:
Originally Posted by cook View Post
You can go as high as you want on the NB without endangering anything its just a matter of what is stable. At Stock it is at 2000mhz. While trying to find the optimum CPU OC, I would keep it as close to that as possible, then when you are happy with the cpu OC, raise it up 1 multiplier and check for stability, then another until you are no longer stable. A higher NB freq will usually net more performance gain than tighter ram timings.
Ok cool I think I only have one multiplier left to go up for this but it takes it from 2ghz to 2.4ghz. Will that still be ok!?

Quote:
Originally Posted by cook View Post
Irrelevant. Leave it as close to 2000mhz as possible. Someone on here ran tests in 3dmark taking the HT from 1000 to like 2400 at 100mhz intervals and it made almost no difference in the 3d mark scores all the way up.

Here is the test
Ok, Ill leave that one. Ta
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post #4 of 17
If 2.4 is stable, it is okay. It should be in multiples of your fsb - If you are running 240 *15 on the the NB should be:

2400 = 240*10
2190 = 240*9
1920 = 240*8

But if you can get stable at 2400, that would be great. I am at 2600 with no problems.
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post #5 of 17
Thread Starter 
I'm at 226*15 for 3.4ghz.
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post #6 of 17
Thread Starter 
Ok I have my RAM timings down to 7-7-7-24 but they are not at 1600mhz. Is there like a ratio thing I am missing to get them there.

NB freq is at high as it can go with FSB at 226 so I guess thats that.

Whats next, tighten timings some more?
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post #7 of 17
You just have to get close with the ram timing thing, they only give you a few choice with the ratio. If you can go higher than 1600mhz then by all means, you should. You just oc'ed your ram, Especially with the 7-7-7-24 timings. Have you tested for stability with this setup? Memtest 86 would be helpful. Now I would push the cpu as high as it can go.
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post #8 of 17
Thread Starter 
I've tested stability with SUper PI, is that a good enough test for memory?
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post #9 of 17
You could push a pretty good amount outta that chip.
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post #10 of 17
Thread Starter 
Ha you say that. I'm not having much luck and temps are already at 53-54 under load with a 1.43 vcore.
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Black Pearl
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