overclocking RAM

[Mjukis]

When I increase the FSB then the CPU, Graphic-card, RAM is overclocked right? How MUCH is the RAM overclocked if I raise my FSB from 100 to 115 for an example? There is also some setting for the RAM´in the BIOS (in school cant remember the setting name)that is like "auto", 1/3, 1/4, 1/2 something like that...
what does these settings do?

Still cannot find my MOBO manual :mad: :mad: :mad:

[BrianCapps]

If I remember correctly, RAM is alyas run at 1/4 FSB, you can change the settings, like 4:4:1, 4:3:1, etc...

Or maybe that's just my mobo/P3.

anyhoo, yes, you can change the settings.

[batboy]

Generally, the memory bus runs at the same speed as the FSB. If you increase the FSB from 100 to 115, then the RAM is running at 115 MHz. If you have good quality RAM (for example PC-100) then sometimes it will overclock above it's rating. As cheap as memory is right now, I'd invest in good higher speed RAM. Usually, 1/2, 1/3, and 1/4 dividers refer to the PCI bus. What BrianCapps was refering to by a 4:3:1 setting actually runs the memory bus at 3/4 the FSB and the PCI bus at 1/4. This setting is helpful for speeds above 133 FSB.

[Mjukis]

ok lets say i have a 100mhz RAM and set my FSB to 130 and then set my PCI bus to 1/3 then would my RAM run at 110 mhz? or at 143? if this is how it works...?

:confused:

[batboy]

Some motherboards allow you to change the memory bus settings or they might have a memory bus divider. But, most do not. I do not know what motherboard you have, so I can't advise you exactly on your situation. But, if you have a "typical" mobo, then setting the FSB at 130 would run the RAM at 130 MHz, unless you have a memory bus divider like I have on my Abit SA6-R motherboard. The faster you run your RAM, the better the performance. If your PC-100 RAM won't overclock at 130, then I suggest getting PC-133 RAM or better.

[Yodums]

Most of the current motherboards set its so the ram is running at FSB speeds as batboy mentioned thats why you most likely won't hit 133 with PC-100 ram etc.

[Mjukis]

Ok thanks everyone :) i got an ASUS cuv4x MB i think i should have probably posted this in the memory section... and how can i tell if a stick of RAm is running cas-3 cas-2 or cas2 (CL2)?

Thanks for the answers everyone hope that you realize how lucky you are not to ahve flamed msg board.. (all to common these days...) :beer:

[batboy]

The RAM latency timing (CAS-2 and CAS-3) is set in the BIOS. CAS-2 is the fastest, but CAS-3 is more stable.

We have a great forum here. Once in a while some mental midget tries to flame here, but our friendly staff will quickly show them the "door" and politely invite them to never return.

[Mjukis]

but a piece of ram can be branded CAS-2 and still only run at
CAS-2-3-3 and i want a CAS-2-2-2... does anyone know if you can check that? (with sisandra?) and maybe a company that sells them? (hopefully they can be found in sweden)

[batboy]

Yes, I believe SiSoft Sandra will give you the RAM CAS rating.

[DocClock aka MadClocker]

Ok the others are right in that most mobo's run the mem at fsb speeds mine will run the mem at lower than the bus....I believe I'm running at 4:3:1...
"Sisoft Sandra" is a benchmarking prog that will give much info on the status of your machine, and if you really want to know what your memory is all about...check out a prog called "ctspd". I believe I found a link to it on overclockers.com but I don't remember where.
Both programs are easily found on the net using a search engine.
Cheers,
Doc

[Yodums]

Sisoft will definitly provide you with the cas and if you find some bios guide and see if you can set some better mem setings.. You'll get the better performance.