Some RAM qustions...

[wolfy87]

I have an memory-divider related question...
I know that DDR means double data rate memory so the actual speed of for example DDR2 800Mhz memory is half of it`s rated speed, or 400Mhz...
I heard that is good to achieve 1:1 DRam : FSB ratio, and very hard to get memory two times faster than FSB so it can match the CPUs L2 cache bandwith...
So if I have an E2160 CPU, on 200Mhz FSB, does it means that if I use DDR2 800, the mobo will automaticly set the 2:1 divider???

When OCing, if I increase fsb so the memory speed increases... So what happens when I move setting 1T to 2T??? If I increase the timings does it decreases the memory frequency, allowing it to stay on it`s stock one, or it just makes it easier for chips to handle increased speed of for example 900Mhz>????

If someone could please explain these to me??? :???

 

[KIAman]

Question 1: So if I have an E2160 CPU, on 200Mhz FSB, does it means that if I use DDR2 800, the mobo will automaticly set the 2:1 divider???

Answer: Depends on motherboard but most motherboards nowadays are bios configured safe and will set the memory to exactly whatever the cpu FSB is by default. If your CPU is 200mhz FSB then your memory will be set at 400 Mhz.

Question 2: When OCing, if I increase fsb so the memory speed increases... So what happens when I move setting 1T to 2T???

Answer: Depends on the motherboard again. Most motherboards will be safe and set setting to 2T. This setting is the command rate (and should be in your motherboard handbook). Setting this to 1 will increase a little system performance at the cost of system stability.

Question 3: If I increase the timings does it decreases the memory frequency, allowing it to stay on it`s stock one.

Answer: No. Also note that increasing timings lowers system performance but potentially increase system stability.

Question: or it just makes it easier for chips to handle increased speed of for example 900Mhz>????

Answer: Typically increasing memory timings allow stability which allow increasing the memory speed.


The more specific you get, the more specific the answers are.

1. memory brand, type and model.
2. motherboard brand, type and model.
3. Cpu = E2160
4. what are your goals (ocing, gaming, pronning, etc)

 

[wolfy87]

Ok just wanted to know those things about OCing...
One more: Decreasing Ram speed is done by divider or manually?
How much can I decrease 800Mhz ram module?

1) I`m looking to get new machine... So:
800MHz OCZ Platinum XTC/CL4 or 800MHz OCZ Gold XTC/CL 4-5-5-15
or 800MHz OCZ SOE XTC/CL 5-5-5-12 can these handle some minor/medium OC stresses?
There also some Titanium and Gold GX XTC in the offer...?
Do you know some around 100e or I think 130$ 2*1GB memory kits that can be stressed at low level? I think that I also have a choice in Corsair and kingston modules...

2) Maybe an Asus P35 midrange( for me ) like p5k-e/wifi-ap, or with same chipset, in similar level Gigabyte boards...
3)e2160 or one from E4x00 series -cause of good OC repp
4)I`ll use it for gaming mainly, and after warranty period (if I succed not to enter BIOS )
some mild, economic (no or very small voltage changes) overclocking...

 

[myocardia]

Originally posted by: wolfy87
Ok just wanted to know those things about OCing...
One more: Decreasing Ram speed is done by divider or manually?

It's done manually, by decreasing the memory multiplier.

How much can I decrease 800Mhz ram module?

You can go as low as the CPU's stock FSB, either 200 Mhz, 266 Mhz, or 333 Mhz, depending on which CPU you buy.

 

[wolfy87]

It's done manually, by decreasing the memory multiplier.

No I meant to say is it done only by multiplayer or I can decrease it`s frequency in some steps of like 5Mhz or maybe 1Mhz?

And should I decrease voltage of DRAM if I decrease it`s speed?
Also what will happen if I decrease voltage on CPU, RAM or others in normal situations when I don`t decrease their speed...? Just my system will become unstable and won`t boot or I can damage components by undervolting??

 

[JustaGeek]

Originally posted by: wolfy87

It's done manually, by decreasing the memory multiplier.

No I meant to say is it done only by multiplayer or I can decrease it`s frequency in some steps of like 5Mhz or maybe 1Mhz?

And should I decrease voltage of DRAM if I decrease it`s speed?
Also what will happen if I decrease voltage on CPU, RAM or others in normal situations when I don`t decrease their speed...? Just my system will become unstable and won`t boot or I can damage components by undervolting??

On NVidia 600i platform you can just select "unlinked" in BIOS, and run the FSB and memory buses independently.

What that means, is that the motherboard will select the appropriate multiplier, you just have to select the frequency, e.g. CPU 1300MHz, RAM 800MHz. The multiplier/divider of 16/13 (in this case) will be selected automatically.

And keep the RAM voltage at its rated values at all times, regardless of frequency.

Same with the CPU - run it at the lowest possible voltage, and if you have to increase the VCore for stability, try to never exceed the maximum CPU voltage specified.

Some might say that 10% over the maximum rated is OK, but I personally do not think so.

Usually undervolting RAM or CPU should not cause problems - if the computer is unresponsive or unstable, just go a "notch" higher next time you boot. And if you can't boot, clear the CMOS and start over.

Good luck!

 

[wolfy87]

Thanks JustaGeek... ->{this looks sarcastic... }

Me to don`t like voltage increasement, whatever they say, I like my machine to serve me long, 3-4 years for me, and 4+ for others(cousin/friend/noname buyer )...