How to lower FSB:RAM ratio in G73JH

I am looking for a tool to enable hidden options in BIOS (AMIBCP 4.0+ or any similar)
I really need to atleast see if there is an option to lower FSB:RAM ratio.
Or if is it possible to do so within windows i'm fine with that too.

Thanks for any info =)
MaxSlo

 

What do you mean lower? Isn't it 1:1 on I-core laptops?

 

Nope, i have i7 720qm runing at 160fsb and could go higher but i am limited by ram, that now runs at 1600mhz (1333mhz stock) because of 1:5 ratio =s and just little over 160 causes bsod.

sorry for bad formatting, posting from phone.

 

seriously doubt you will do this. I found only some channel interleave and rank interleave. And frequency mode from800 to 1600 for clarksfield. in G73 BIOS. Anyway link on AMI v4.5

 

thanks =)
will look into it asap

no good =( seems like everything should be visible from bios already, but i only see half of the settings :S
I'll try throwing a stick of 1066MHZ ram and see if the ratio decreases, and if it does,
which registers control that, so i can adjust it to my needs wish me luck

 

The Core i3/i5/i7 series do not have a FSB. You mean the base clock? You can't alter that by more than a few MHz without causing system instability. Overclocking these chips is an entirely different matter compared to Intel's old FSB-based architectures.

 

Yes, i meant BCLK, from what it seems to me my CPU can handle 27MHz increase on BCLK, and could go higher if not limited by RAM.



that is why i would need to know if i can decrease ram speeds wihout lowering CPU speeds too.

judging by this literature, it's definitely possible to do so, just need to figure it out.

 

The BCLK is responsible for more than just RAM timings and core frequency. It's integrated into PCIe control and a good bit more -- none of which can tolerate a large variance in BCLK. This is an except from the desktop Sandy Bridge review at AnandTech. Current processors are not dis-similar to the review unit. "non-K" processors can only be slightly overclocked by increasing BCLK, but as you have found out there are limits to this. K-series processors (or at least whatever the designation is for notebook processors) have their frequency multiplier unlocked and can be overclocked by manipulating the multiplier.

AnandTech - The Sandy Bridge Review: Intel Core i7-2600K, i5-2500K and Core i3-2100 Tested

 

The JH doesn't have a Sandy Bridge CPU, but a Clarksfield one. As such you aren't as limited when playing with the BCLK.

 

Hot dog, you're right tijo!

 

I don't have Sandy Bridge, i have Clarksfield CPU (720QM) XD, thus still have BCLK:RAM ratio =)

edit: tijo already answered that, didn't saw there was page 2 already XD

 

also sb processors have 100 mhz while this one has 133.
good luck.
to unlock smth you need at least to change access from default to user. but it will open only smth which is in already unlocked main menus.
how to unlock main menus I dont know

 

i'll stick to editing PLL control registers if i won't be able to understand how to lower ratio, then i'll go to bios editing =)

edit: PC won't even post with only 1066MHz ram stick in it :S guess i'll be doing some bios modding again

 

This should be the option to limit RAM speed you were talking about, right James?

 

no, i did not notice that. Hmmm.

 

:S OMG soo many options for ram frequency, i'll just enable all, and then see later in bios wich one is correct one XD,

maybe the one that already has speeds written in optimal/failsave

 

success =)
will post screnshots as soon as i finish OCing =)

posted too fast, the timings now are too low, and that puts me even further back than where i was
can't even reach 1.85GHz stable now, if anyone has any idea how to loosen the timings within windows that would be awesome.

 

congratulations! I was following the Topic, and I was rooting for You! You were very courageous! hahaha

Managed to significantly increase your overclocking?

not my FSB rises above 160.
If I try to go above that, I have a blue screen.

Can I try on my G73JW? (i7 740QM)

 

Yeah, i suceeded, but i still have problems with OCing
the memory doesn't seem to like CL7, and now i need a way to change timings to CL9 within windows, then i hope i'll be able to reach 2GHz.

ram speeds and timings now


sure you can try, but i think you will have the same problem with timings.
i'll post a tutorial in the morning.

 

you can use taiphoon to reflash it with that timings you want. It costs some money though. But download trial version and read profiles from RAM you use now.

 

Did you lower it to 1066 in the BIOS editing?

 

I'm curious too! What you did specifically?

Can you set the memory to 1600Mhz to Work?

my memories run at DDR3 1333 1600Mhz with FSB 160.

However partnerships that the Data Transfer between the CPU still in 1333.

 

Well seeing his FSB ratio is lowered to 2:8 so I assumed he lowered it to 1066

 

Yes, all you need to do is change optimal value of to 1066 in bios and then reflash.

ok, will test taiphoon =)
thanks James

 

more specifically where you changed the Bios.rom?
I can set to 1600Mhz? I have a problem?

You have also noticed what bios options related to the QPI. it can be modified to increase the performance?

 

no, it's max memory frequency, so if you set it to 1600, you will still boot up with 1333MHz on ram.
Only set max freq as shown on this picture, save bios and reflash it. (you will need AMIBCP 4.53 was shared by James on 1st page)
If it doesnt work, also load default settings.

WARNING: DO NOT TOUCH FAIL SAVE SETTINGS!!!



The QPI freq can lso be changed, but i wasnt fiddling with that.

 

Tried taiphoon burner & MemTweakIt, neither worked

 

what do you exactly mean neither worked

 

couldn't change timings, MemTweakIt didn't even read timings.

 

bad news:
Flashed the memory to have loosened timings CL9 @ 1066MHz, and i can reach the same speeds as before i started lowering RAM ratio and timings. XD guess something else memory related is holding the cpu back at this point, always getting RAM related BSODs when going over 160MHZ BCLK with the OC.
Shooting blindly here but i guess it must be that QPI or Northbridge speeds are at their max they can achieve and i havent found anything to lower them wihout lowering BCLK.