Is this right?

Dob1eman

Dob1eman

Dob1eman

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Derbyshire
I am a newbie overclocker and have just got the following:

Abit IP 35 Pro
Q6600 Quad CPU
4GB Corsair XMS2, DDR2 PC2-6400 (800Mhz ) CAS 5-5-5-18

Could somebody confirm whether the maths is right please?

9 X 334 this would set my CPU at just over 3.0Ghz this would then make my ram run at DDR667mhz, in a 1:1 ratio with my FSB? I don't want to increase voltage if I don't have too.
 
If you drop the multiplyer to 8 you could do 8x400 to get 3.2ghz and run the ram at 800mhz.

Or if you did it in a ratio of 4:5 you could run the ram at 1000mhz.

Im still unsure of how all these ratio things work. But i beleive it can be done. But whether or not you see a significant performance boost i dont know.
 
8igdave said:
If you drop the multiplyer to 8 you could do 8x400 to get 3.2ghz and run the ram at 800mhz.

Or if you did it in a ratio of 4:5 you could run the ram at 1000mhz.

Im still unsure of how all these ratio things work. But i beleive it can be done. But whether or not you see a significant performance boost i dont know.
Click to expand...

Good idea, thx. I did look into doing 8x400 to get 3.2 and that would allow the ram to run at 800mhz, but somebody told me that would only be possible by increasing the voltage is that right?
 
helmutcheese said:
To later overclock yes, and the 800 may have tighter timmings at 667, its cheap to buy anyhow.
Click to expand...


He means overclocking 667 to 800. I think you mean buying 800 and underclocking it to 667??

:EDIT: My mistake you were right.


Puting 1.4 volts through it should be fine. Lots of people are putting far higher i beleive?

Someone else back me up on that before he does it lol
 
Last edited:
8igdave said:
He means overclocking 667 to 800. I think you mean buying 800 and underclocking it to 667??



Puting 1.4 volts through it should be fine. Lots of people are putting far higher i beleive?

Someone else back me up on that before he does it lol
Click to expand...

Right cheers certainly something to look at. Am I right in thinking that to change CPU volts to 1.4 it would be the setting called CPU Core Voltage? I know it might seem a silly question but there are a few options in the bios for changing different voltages?

And yes I have already ordered 800mhz memory was asking whether it would be a noticable difference clocking it at 667? Would it be worse performance overall?
 
Not overly sure on total performance degreece. But considering you can probably quite easly get it 1000mhz you should see a good performance boost from 667 to 1000.


OOo yeah and it should be cpu volts.
 
8igdave said:
Puting 1.4 volts through it should be fine. Lots of people are putting far higher i beleive?

Someone else back me up on that before he does it lol
Click to expand...
Yeah I'm putting 1.5v through my Q6600. The load temps are far more important than the actual CPU voltage.
 
OK I am going to try this 8x400 to get 3.2ghz and run the ram at 800mhz. I will increase the CPU voltage slowly upto about 1.4 if needed.

Do I need to change anything to get the memory to work 1:1 at 800mhz or will it do it automatically once I OC the CPU?
 
Providing you have set the memory to 1:1, set the vdimm to 1.8v and the timings to 5-5-5-15, it should sit at 800mhz once you raise the FSB to 400mhz.
 
Cob said:
Providing you have set the memory to 1:1, set the vdimm to 1.8v and the timings to 5-5-5-15, it should sit at 800mhz once you raise the FSB to 400mhz.
Click to expand...

OK got it


Do you know what vdimm is called in my Bios is it either DDR2 Voltage or CPU VTT 1.2V Voltage?
 
Cob said:
It'll be DDR2 Voltage.
Click to expand...

OK must say again thanks for all the info you have been a big help in me learning about OC-ing.

I have just 2 more questions which are more out of intrest than anything else.

1. On my new memory has posted the CAS is 5-5-5-18, yet you say to use 5-5-5-15 for what reason?

2. Also what CPU Overlock have you settled for with your's and what settings did you use?
 
I'm just used to typing 5-5-5-15. If it's meant to be 5-5-5-18 then you can set it to that. It won't make any difference tho tbh.

Mine's currently running at 416x8 (3.33ghz) @1.5v, with my PC8500 running at 1040mhz 5-5-5-15 @2.1v. The Q6600 will run faster, but I have all 4 cores Folding at 100% 24/7 and temps are a bit high this time of year.
 
Cob said:
I'm just used to typing 5-5-5-15. If it's meant to be 5-5-5-18 then you can set it to that. It won't make any difference tho tbh.

Mine's currently running at 416x8 (3.33ghz) @1.5v, with my PC8500 running at 1040mhz 5-5-5-15 @2.1v. The Q6600 will run faster, but I have all 4 cores Folding at 100% 24/7 and temps are a bit high this time of year.
Click to expand...

OK that's about all I need to know for now. I will be doing the OC on about Tuesday once I have finished upgrading the PC. I will let you know how I get on in this thread :)
 
8igdave said:
He means overclocking 667 to 800. I think you mean buying 800 and underclocking it to 667??

:EDIT: My mistake you were right.


Puting 1.4 volts through it should be fine. Lots of people are putting far higher i beleive?

Someone else back me up on that before he does it lol
Click to expand...

on Conroe/Kentsfield you should use no more than 1.525V for a 24/7 overclock.

But on the Quad temperatures should be in issue before you get up there. Keep it around 60*C max load.
 
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