quick question about memory timmings

[edub2006]

heres some screens to my bios.

screen

my ocz mem is rated at 2-3-2-5 @ latenct 2 what values do i change? it seems that my bios is detecting something else. Im a noob here, i cant figured out what numbers to put where. Some help would be great!!

oh! one more thing where the hell is this memory divider people keep talking about? i cant seem to find it


thanks

 

[GML3G0]

Change RAS to CAS (Trcd) to 3. Other than that, it looks fine. The other timings (other than 2-3-2-5) seem a bit tight, but try it out. If it's stable, then you can leave them as is.

EDIT: Memory divider is that Memclock index value.

 

[edub2006]

so if im OCing the memory index should be set lower?

 

[Shimmishim]

it depends...

sometimes you can loosen the timings so you don't need to use a memory divider...

you can also increaes voltage as you increase your FSB/HTT to get more stable...

but if you have REALLY crappy ram that doesn't overclock well with voltage or by loosening the timings, then yes, using a divider would be recommended.

then there is the argument of low htt and tight timings vs. htt and loosened timings but we won't get into that

 

[edub2006]

so does it automatically divide the memmory? or is there a way to disable it?

this is what i get so far.im trying to hit 2.6 or so on my opteron 165,
i got the cpu frequenzy to 289 , cpu multipler to 9 and memory set to what i showed above . (with those timings) my comp does no boot to windows, says failed boot

whats the deal?

 

[Ricemarine]

You must lower the divider manually (unless there is an auto option). If you're attempting 289 MHz, I REALLLY suggest you don't use 2-3-2-5 as your latency, and I doubt your ram would boot at that speed... Try setting your divider at 266 MHz, and work your way up from there, and after the ram reaches 205 MHz, relax the timings to 2.5-3-3-7, TRC 7, TRFC 14.

 

[edub2006]

thanks rice for tips i will try that.

whats the diffrence between 1T ans 2T? which one works for me

also, will uping voltage on my ram help it boot up? or should i bump the cpu voltage enstead?

 

[Ricemarine]

Originally posted by: edub2006
thanks rice for tips i will try that.

whats the diffrence between 1T ans 2T? which one works for me

also, will uping voltage on my ram help it boot up? or should i bump the cpu voltage enstead?

Well, first question... What is your ram? What are the specs of your computer?...

To answer yours.

1. 2T is more stable, but there will be a decrease in memory bandwidth and latency, while 1T works well, but not as stable unless you got fully stable ram.

2. I would not suggest going over 2.8v for your ram, you should bump the cpu voltage, but not by much, just little by little... Just make sure you don't fry your cpu or your ram! You should read overclocking guides before advancing forward.

 

[edub2006]

yea i tried reading the guides, i understand the whole fsb/htt thing i just dont get the memory stuff.im just bad with numbers i think. the whole memory divider ,timings throw me into a spiral of death

here are my specs,

asus sli premium
opteron 165 0550upmv
2 x1gb ocz pc3200 el platinum
550w antec truepower

 

[Ricemarine]

Originally posted by: edub2006
yea i tried reading the guides, i understand the whole fsb/htt thing i just dont get the memory stuff.im just bad with numbers i think. the whole memory divider ,timings throw me into a spiral of death

here are my specs,

asus sli premium
opteron 165 0550upmv
2 x1gb ocz pc3200 el platinum
550w antec truepower

Ok, first off, your ram wasn't meant for overclocking, meaning you'd have to be using a divider to keep your ram around 230 MHz ish with timings of 2.5-3-3-7. So lower the divider to like 333 or 266.

 

[edub2006]

so in "theory" this should work?

289x9
htt=x3
cpu voltage @ 1.4
2-3-3-7 trc 7 trfc 14 2T @ 2.8v
mem divider at 266mhz

this should boot up?

 

[Ricemarine]

Actually try 289X9
HTT=3
CPU Voltage = 1.4-1.45v
2.5-3-3-7 1T TRC=15 TRFC=17 (for stability purposes)
memory divider should be ddr333.

It should give your ram 236 MHz. If it is bootable, otherwise, lower the memory divider to 266 MHz, and boot at 2-3-2-5.

 

[edub2006]

thanks rice! appriciate the help man

 

[GML3G0]

I'll copy and paste one of my posts from another forum. Hopefully this clears up the memory confusion.

Originally posted by: GML3G0
Now, about the RAM. You're probably going to need to run a different divider than the default one. Pretty much everything is derived from the base HTT speed as you saw earlier with the 1000MHz Hypertransport. That includes memory.

The default divider is 400:400 or 1:1.

The system calculates RAM speed as follows:

CPU_SPEED / (INT)(MULTIPLIER / DIVIDER_RATIO)

So, for example, you have a 2GHz 3800 X2 using a 333/400 memory divider ratio (or 166/200 depending on the motherboard). Let's say you managed to get your CPU to do 2.4GHz.

2400MHz / (10 (333/400)) = 2400 / (10/0.83) ~ 2400 / 12 = 200MHz

If the mutiplier divided by the ratio is not an integer, it rounds up to the nearest integer.

You always have a "divider" running, even if you don't touch it.