Memory clocking.

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Silly question potentially...

Got myself some Corsair 2GB DDR2 XMS2-6400C4 TwinX (2x1GB)
for my ASUS P5B motherboard, and seein as the MB's max DDR speed is 800Mhz (the speed of my RAM), does this mean i cant clock higher than that when overclocking?

Also, it says in CPU-Z that my DDR2 is running at 399.1 Mhz, does this mean that they're not running fully?
Or do they combine to make the 800mhz speed?

If not, how do you enable dual-channel?

Sorry im a bit new to OC'ing.

Thanks for any help :)
 
Blokey57 said:
Silly question potentially...

Got myself some Corsair 2GB DDR2 XMS2-6400C4 TwinX (2x1GB)
for my ASUS P5B motherboard, and seein as the MB's max DDR speed is 800Mhz (the speed of my RAM), does this mean i cant clock higher than that when overclocking?

Also, it says in CPU-Z that my DDR2 is running at 399.1 Mhz, does this mean that they're not running fully?
Or do they combine to make the 800mhz speed?

If not, how do you enable dual-channel?

Sorry im a bit new to OC'ing.

Thanks for any help :)
Click to expand...

First off its DDR or Double-Data-Rate, twice whatever the memory bus is running. Now the FSB is the CPU bus your 399.1 (are you sure 399? that's pretty fast). The memory can be run 1:1 or in a ratio to the FSB. The ASUS should set ratios something like DDR2-800 is 1:1 or DDR2-1000 is 4:5 and so on up or down. You may have to select manual settings or switch off AI or something to get to it.

e.g. If you set an FSB of 400 and memory divider (ratio) or DDR-1000. The memory bus will be at 500 and the memory at a 1000. Also known as PC8000.

Dual channel is when two memory sticks are interleaved. Interleaving memory means you use 2 or more banks of memory so the first data comes from one bank and the next sequential data comes from the 2nd bank. Basically speeds things up. On the motherboard stick them in the same colour slots.
 
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Hey again, sorry for slow replying, i've been at work! :(

My FSB isnt 399.1mhz, my DRR frequency was. (Used AI *** to up the speeds by 3% :eek: ) :p

Currently my FSB is 273.5Mhz.

Thanks for all the info Fornowagain, most useful!

To make it easier for me, is anyone able to tell me the settings for Overclocking to 3ghz?

i dont really know how to, hence why i used AI ***. Im an amateur that wants some more speed :D
 
Conroe E6600
Corsair 2GB DDR2 XMS2-6400C4 TwinX (2x1GB)
Asus P5B Motherboard
Zalman Aero Flower CPU Cooler
X1900 XT 512Mb Graphics card.
WD 250Gb SATA HD
Antec Neo500 PSU

:)
 
Easy 3GHz on that. First check latest bios, if not flash it.

Turn off AI clocking, set to manual.

PCI set to 33
PCI-E set to 101
Set vcore to 1.4v to start.
MCH to 1.5v
Vdimm 2.1v
Turn off SPD memory timings set them yourself, maybe 4-4-4-12
Set memory to DDR-800 1:1
Put FSB to 333
Turn off anything you don't need.
Turn off Hyperpath 3 any EIST or speedstep.

Try that and come back with anything else I've forgotten.
 
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Hey again, i was looking through the bios, and was going to put the settings that you suggested to the test.

But half of them arent on the Jumperfree configuration section or the other CPU related ones.

I have:

AI Tuning (Manual etc)
CPU Frequency
DRAM Frequency
PCI - E frequency (currently set to auto in the manual config)
PCI-Clock Syncronization mode (set to auto)
Spread Spectrum (auto)
Memory Voltage (Auto)
CPU Vcore Voltage (Auto)
FSB Termination Voltage (Auto)

and that speedstep thing is disabled already in the other section (name escapes me off the top of my head) :confused:

Any idea what i should put these settings to?

Thanks a lot for your time and patience so far mate :)
 
The settings can be all over the place, they even move them with different bios versions, so keep looking they're there somewhere in one form or another.

AI Tuning (Manual etc) Manual
CPU Frequency 333
DRAM Frequency ddr-800
PCI - E frequency 101
PCI-Clock Syncronization mode 33
Spread Spectrum disable
Memory Voltage 2.1 for corsair
CPU Vcore Voltage 1.4
FSB Termination Voltage Auto

Keep going.
 
Well i did all the settings apart from MCH which i cant find.

1:1 (which im guessin is just choosing DDR2 800 yeah?)

and then i chose save settings and exit...

Then it wouldnt start up :eek:
The fans just powered up full pelt and nothing happened, i got a little worried, then turned it off and luckily, as i guess you overclocking pro's know, it started off with the Overclocking failed screen.

Why did it not work? :confused:

Thanks for your input so far mate :)
 
Blokey57 said:
Well i did all the settings apart from MCH which i cant find.

1:1 (which im guessin is just choosing DDR2 800 yeah?)

and then i chose save settings and exit...

Then it wouldnt start up :eek:
The fans just powered up full pelt and nothing happened, i got a little worried, then turned it off and luckily, as i guess you overclocking pro's know, it started off with the Overclocking failed screen.

Why did it not work? :confused:

Thanks for your input so far mate :)
Click to expand...
The MCH for a start, got to be on there somewhere, you've got one.

Don't worry this is par for the course, you won't kill it unless you put the core voltage through the room.

Turn the memory way down, so its not part of the problem 2:1 for a start try the lowest divider and try again. Can't see it needing more than 1.4v core 3GHz, don't go over 1.55v on the aero cooler.
 
Blokey57 said:
i dont mean to sound stupid, but i dont understand too well about which timings to turn down etc

what does MCH stand for anyways? :confused:
Click to expand...
Its not stupid to ask questions gotta start somewhere.

MCH is the northbridge controller on the board, short for Memory Controller Hub. To get it to work at higher FSB's than 233MHz it needs a push in volts. The memory ratios are the 1:1 or DDR-800 as its described. The timings are have names like cas ras tras, these determine how long the memory waits for the cpu amongst other things, looks like 4-4-4-12 or what ever the ram is designed to run at. Turn the ratio down so the ram runs slower than the cpu.
 
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ah i see, so what settings do you recommend for the memory?

Thanks again for your help, im learning :D


Oh also, when i set the VDIMM to 2.1v the voltage gets highlighted, makes it look like its a bad idea to set it at that? :confused:
 
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Blokey57 said:
ah i see, so what settings do you recommend for the memory?

Thanks again for your help, im learning :D
Click to expand...
The idea is to find what is stopping the overclock. So find the cpu limit then the ram. Turning down the memory ratio lets you test the cpu speed. Thing is lots of throttling, thats things that slow down the cpu to conserve energy, get in the way. That's why you turn most of it off to start, once you have the clock then put stuff back one at a time. Unless you know its carp and don't bother. Your ram is designed to run at 400/800 at stock so I doubt its that tbh. It could be one little thing holding it back, they call it a wall.
 
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ok, will do.

So what should i turn down, seems kinda odd that it wont start anyways to be honest, seeing the other clocks people have got ouuta this chip. :confused:

and can it be step-by-step if possible?

(im being very cautious as i im new to this and spent a lot on upgrades) ;)
 
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