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[Q8400] My First Overclock... The Proper Way in BIOS: Help Needed - Page 2

post #11 of 16
revlimiter

Here are a few pictures from my Gigabyte GA-P35 DS3R bios. Overclocked my Q9400 to 3.6GHz@Rock stable. Q9400 is very similar to the Q8400. Also, I would assume our bioses are not that different.

Mind you, that Static tRead Value I downed from 8 to 10! Could probably run 9 in my 8GB setup, but played safe. 8 was to tight for me.



    
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post #12 of 16
Thread Starter 
Oh wow awesome, thanks for the lengthy replies everyone!

Quote:
Originally Posted by tpi2007 View Post
- You RAM is not working as the maker intended. 5-5-5-15 (what you have), along with 5-5-5-18 is also standard timings.

This is your RAM: http://www.ocztechnology.com/ocz-ddr...annel-eol.html

800MHz DDR2
CL4-5-4-15(CAS-TRCD-TRP-TRAS) <--------------- these are the latencies you should be using
Available in 1GB modules and 2GB D/C Kits
Unbuffered
Platinum Mirrored XTC Heatspreader*
Lifetime Warranty
2.1 Volts <---------------- in conjuction with this voltage
240 Pin DIMM
tpi2007, are you suggesting that using 4-5-4-15 on all of my RAM sticks will improve performance? I wonder why it is set to 5-5-5-15 if the manufacturer intended it to be 4-5-4-15? And what is the manufacturer's intention: performance or longevity?

Just trying to get a feel for things and learn along the way.

Thanks!
    
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post #13 of 16
Thread Starter 
Wow! I was having trouble booting, and setting my RAM timing from 4-5-4-15 with the DRAM voltage bumped up to 2.1000V fixed it!

I am now able to boot into Windows without any problems, Core Clock is set to 400 and I am now getting 3.2Ghz out of my Q8400.. Gonna try a couple tests to see how stable it is.

Quick question: Should I be running 2.0B or 2.0D for my memory clock multiplier?

It said 2.0B was for 333Mhz FSB and 2.0D is for 400Mhz FSB. My chipset's FSB is 333MHz so I have it set at 2.0B. But should I be using D because I have overclocked it to 400 in the BIOS?

Thanks!
    
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post #14 of 16
Quote:
Originally Posted by revlimiter View Post
Wow! I was having trouble booting, and setting my RAM timing from 4-5-4-15 with the DRAM voltage bumped up to 2.1000V fixed it!

I am now able to boot into Windows without any problems, Core Clock is set to 400 and I am now getting 3.2Ghz out of my Q8400.. Gonna try a couple tests to see how stable it is.

Quick question: Should I be running 2.0B or 2.0D for my memory clock multiplier?

It said 2.0B was for 333Mhz FSB and 2.0D is for 400Mhz FSB. My chipset's FSB is 333MHz so I have it set at 2.0B. But should I be using D because I have overclocked it to 400 in the BIOS?

Thanks!
You should be using 2.0B, look up the previous posts I wrote here where I explain that.

As to the memory, 5-5-5-15(or 18) is the insdustry standard for DDR2 800, to which all memory modules must comply, so the PC can boot. Even if you buy high performance memory (which you did), it will most likely boot at the standard settings. You have to manually set it as the vendor intended them to work.

I have no idea about longevity, but they should last the same warranty period as the others, at least. They are normally higher quality anyway, so they should definitely.

As to the timings, there should be some improvement, but not much. It's much more about getting them to work at the specifications the vendor intended than anything else in your particular case.

The thing is, they must boot at stock settings like I said because that is the industry standard, but using them like that in Windows does not guarantee absolute stability, hence the recommendation to use them at the settings the manufacturer says.
 
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post #15 of 16
Thread Starter 
Ahh, OK thanks.

So if I bump up my CPU Host Frequency to be over 400+Mhz should I also be changing the System Memory Multiplier "2.0B" setting to something else?
    
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post #16 of 16
Quote:
Originally Posted by revlimiter View Post
Ahh, OK thanks.

So if I bump up my CPU Host Frequency to be over 400+Mhz should I also be changing the System Memory Multiplier "2.0B" setting to something else?

Like I wrote in an earlier post, if you don't change the memory multiplier, the RAM will be overclocked along with the higher FSB. So you either have a choice of keeping it as it is and see how far the RAM can get overclocked, possibly by relaxing the timings to 5-5-5-15/18 - OR by changing the multiplier and get a slower working ram.

You then have to benchmark to see if the first scenario is stable, or if you go with the second scenario, if the performance hit of having slower working ram is worth the performance gains of the overclock on the CPU.


Quote:
Originally Posted by tpi2007 View Post

3.2Ghz is a nice setting because it allows your RAM to remain exactly as it is, at 800Mhz. Set the ratio to 2 (The bios has many options and four letters - A, B, C, and D - you should set the RAM multiplier as if you had a 333 Mhz Bus AND NOT a 400 Mhz bus - simply because your native FSB is actually 333. If you set the letter corresponding to 400 the computer won't boot properly - that is what happened to me)

If you want to go higher, you should slowly add 10 Mhz increments to your FSB and see if the CPU is stable, or needs additional voltage. You will also need to look at the RAM, as it will overclock with the FSB from here on, unless you set a different RAM multiplier (don't forget the letter), in which case you will probably end up with slightly slower running RAM. Or, you can relax the timings on the RAM and let it get overclocked with the FSB. 5-5-5-18 at 900 should still be doable on your RAM.
 
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