FSB\DRAM Ratio

What should the ratio ore something stay on my mb::
MSI K7N2G-LISR
Tbred 2000 (266fsb)
2x512 ddr TWINMOS (2100)

Quote
Originally posted by |-Raider-|
What should the ratio ore something stay on my mb::
MSI K7N2G-LISR
Tbred 2000 (266fsb)
2x512 ddr TWINMOS (2100)
a 1 to 1 ratio should work just fine.

Similar Messages

Fsb/dram ratio on p31 neo

hi,
i have p31 neo board. in bios the only option for fsb/dram ratio is 1.1.66 and 1.2. with this option overclock is almost imposible (fsb <240)
a bios update will resolve problem or i can't do anithing.
thanks
msi p31 neo
pentium dual core 2160
2*1 gb ddr2 pc 6400
wd 3200aaks
gainward 8600gt
corsair vx450
case asus

Actually, the system should start even with DDR2-1066 memory installed, but it should recognize it as DDR2-800. You will not have additional memory dividers when inserting DDR2-1066 RAM. You even be able to increase memory speed beyond DDR2-800 MHz by increasing FSB Clock Speed. However, there is no guarantee that you can successfully make your RAM operate its rated speed.
If you are really planning to overclock your system, you may be better of looking for a board that is more up to this task (P35 Neo2/P35 Platinum would be a much better choice in this case.)

FSB/DRAM ratio ignored ?

Hi all I am getting really weird problems with my DRAM ratio to FSB. When i set it to 1:1.00 sometimes it takes it and sometimes its defaults itself to 1.2 even though its set on 1.00 Its really random when it does it as well like when i set my fsb to 385 it does it and when its at 395 it does it but at 390 it wont (most of the time it has done it before) It just seems really intermittent and weird to me... any help would be appreciated as this is my one block from getting slightly higher clock speeds from my e6600
My setup:
MSI P45-Neo3-fr
MCH Voltage = 1.40V
ICH = 1.60V
FSB Termination = 1.45V
E6600 3.51ghz 395x9 @ 1.505 vcore
Spread Spectrum Disabled
C1E Disabled
EIST Disabled
2x1gb OCZ Gold PC6400 5-5-5-15 790mhz @ 1.908V
if you need any more info just let me know and i'll see what i can do right now it is rock solid 12 + hours of Orthos max load temp of 52 w zalman CNPS-9700 you see why i think it has more to give :P
Thanks in advance! I know someone will be able to give me some advice!

I meant the button to modify forum posts....:
Modify
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AH HA!! Modify to modify my post! gotcha! lol sorry ... i'm slow (i added this line with modify see i'm learning... lol)
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It just seems really intermittent and weird to me...
Well, it is weird. That should not happen. If this is a BIOS Problem, it can only be fixed with a new BIOS.
In any case, one question:
What position are your OC Jumpers in?
Quote
E6600 3.51ghz 395x9 @ 1.505 vcore
That is quite a lot of voltage for that clock speed. Have you checked if you can get the system to get through POST with less than that? (~1.4V maybe?)

MOVED: fsb/dram ratio on p31 neo

This topic has been moved to Overclockers & Modding Corner.
https://forum-en.msi.com/index.php?topic=115046.0

Actually, the system should start even with DDR2-1066 memory installed, but it should recognize it as DDR2-800. You will not have additional memory dividers when inserting DDR2-1066 RAM. You even be able to increase memory speed beyond DDR2-800 MHz by increasing FSB Clock Speed. However, there is no guarantee that you can successfully make your RAM operate its rated speed.
If you are really planning to overclock your system, you may be better of looking for a board that is more up to this task (P35 Neo2/P35 Platinum would be a much better choice in this case.)

P31 Neo-F - I don't have 1:1 FSB\memory ratio

MSI P31 Neo-F (Bios 1.2) Rev 1.0
Corsair 6400XMS2 2 x 1Gb (Dimm1 & Dimm3)
Core2Duo 4300
Core2Duo 6300
The BIOS sees both sticks of RAM. I have tried slots 2 & 4 in desperation as well.
I can not get 1:1 memory ratio.
With the 4300 I get AUTO\1:1.66\1:2. Set to Auto it runs at 1:1.6
With the 6300 I get AUTO\1:1.25\1:1.5 (if my memory servers me right). Set to Auto it runs at 1:1.25
I have cleared the BIOS many times. What am I doing wrong?

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The Corsair memory is DDR2-800 isn't it?
Quote
Corsair 6400XMS2 2 x 1Gb (Dimm1 & Dimm3)
Yes, and there should be no problem making your RAM operate @800 Mhz by choosing the proper FSB/DRAM ratio in BIOS.
Quote
My MSI P35 Plat runs with the same memory at 1:1 fine with the same processor. So are you saying the P31 can not do the same?
I know, this matter is complicated, but I will try to explain and to give you at least a partial answer. P31 and P35 chipsets do not use the same memory controllers. Have a look at the Intel Datasheets for both memory controllers:
P31 / 82P31 Memory Controller Hub (MCH) --> DATASHEET
Page 21:
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Supports Front Side Bus (FSB) at the following Frequency Ranges: - 800/1066 (200/266MHz)
and Page 25:
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Differential Host clock of 200/266 MHz (HCLKP/HCLKN). Supports transfer rates of
800/1066 MT/s.
Compare to:
P35 / 82P35 Memory Controller Hub (MCH) --> DATASHEET
Page 27:
Quote
Supports Front Side Bus (FSB) at 800/1066/1333 MT/s (200/266/333 MHz)
and Page 31:
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Differential Host clock of 200/266/333 MHz (HCLKP/HCLKN). Supports transfer
rates of 800/1066/1333 MT/s.
As you can see, according to Intel specs, the P31 chipset itseld does not offer native support for CPUs that operate @333 (1333) MHz FSB Clock Speed. That is why, from a chipset point of view, the number and variety of possible dividers is less compared to the P35 chipset. Looking at the differential between FSB and Memory Clock speed you can also see that 1:1.25/1.1.5 (E4300) and 1:1.66/1:2 (E6300) are the native chipset ratios to match DDR2-667 and DDR2-800 RAM with FSB/200 MHz and FSB/266 MHz processors.
Of course, in practice chipset limitations can be exceeded by BIOS programming to a certain degree. That is why P31 boards actually do support FSB/333 MHz CPUs, but the support is not native. Have a look >>here<< as well.
The only situation in which you actually need the 1:1 memory divider is overclocking, but since this a budget board not meant to be put to excessive OC use, BIOS implementation of memory dividers that go beyond Intel specs is limited. After all, it is a matter of price/performance. The MSI P31 Neo-F matches the Intel specs and exceeds them when it comes to FSB/333 MHz processors, there is no real mistake here. I can find nothing in the Intel specs nor in the MSI Product information that says there has to be a 1:1 ratio implemented at all costs.
There is a chance, of course, that MSI will implement more memory dividers in a future BIOS release. Try contacting MSI, maybe they can give you a more definate answer this one:
http://ocss.msi.com.tw/
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The Intel chipset is capable of offering 1:1
Capable: yes, native support: no.
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The issue is MSIs implementation of it = BIOS.
You are most likely right about BIOS implementation in general, but I don't see a reason to call it an issue at this point.

Need info on FSB to DRAM ratio

I'm looking for information on FSB to DRAM ratio. I've done a search but no luck so far. In most cases I see the ratio at 1:1 but there are others as you may all know. What are the implications if one is at 1:1 versus something else?
Thanks

Read the FAQ at the top of the P4 forum.

FSB:DDR ratio?

I don't really understand the FSB:DDR ratio? I have a MS-6758 LSR with a P4 2.6HT . I have 1 gb of Crucial TEch DDR Ram. I downclocked my FSB back to normal because of an instable system in windows ( freeze all the time).
Can you help me finding the best settings ( FSB, DDR CLocks, AGP VOLTAGE ect..)
Thanks very much !!!!

You don't really 'lock' it to 400. You set it to 400 which puts it in 1:1 synch with the FSB at 200. I think what you want to do is set the DRAM clock at 333, so as it steps up with the FSB it won't reach 400 until your CPU is at a higher speed.
If you get this working, please report your current benchmark and your new benchmark when not running 1:1. I'm cursios to see the net effect of increasing your CPU speed while sacrificing memory speed.

Setting FSB:DDR ratio?

How does one go about setting the FSB:DDR ratio on the Neo-2 (865)?
I'm trying to overclock my P4 2.4C (with HyperX PC3500 RAM), but I'm not able to get any higher than about 2.7 GHz because the DDR frequency gets too high, even if I lock it at 400 MHz in the BIOS.
Is there a setting I'm missing? Does the board automatically set the ratio if the system bus is set high enough?
Help would be appreciated, thanks.

You don't really 'lock' it to 400. You set it to 400 which puts it in 1:1 synch with the FSB at 200. I think what you want to do is set the DRAM clock at 333, so as it steps up with the FSB it won't reach 400 until your CPU is at a higher speed.
If you get this working, please report your current benchmark and your new benchmark when not running 1:1. I'm cursios to see the net effect of increasing your CPU speed while sacrificing memory speed.

MOVED: MSI P31 Neo and FSB/DDR ratio

This topic has been moved to Overclockers & Modding Corner.
https://forum-en.msi.com/index.php?topic=116635.0

Hello Aacko,
the P31 Neo is a budget board that is not really designed for overclocking (notice the red PCB). The P31 chipset supports DDR2-667 and DDR2-800 memory modules. With a FSB-200-MHZ-CPU installed, 1:1.66 and 1:2 are exactly the ratios you need to get your RAM to 667 MHz or 800 MHz.
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Can I do something about this or should I swap P31 Neo to some P35-chipset mobo that would allow more flexible FSB/DDR ratio settings?
If you really want to overclock, you should go for a P35 Platinum or P35 Neo2-FR/FIR board.

Set FSB:DRAM 1:1

HELLO ...
this is my system :
PD 930 3.0
MSI 945P NEO
2G DDR2 533
I AM TRIYNG TO OC MY CPU BUT I HAVE A PROBLEM . HOW CAN I SET THE FSB:DRAM TO 1:1 IN THIS MAINBOARD???
I DIDNT FIND THE OPTION TO DO THAT ..
2- WHATS THE LAST BIOS VER. FOR MY MAINBOARD??
THANKs FOR THE HELP

Quote from: the king2006 on 19-September-08, 13:37:32
but why i dont have 400 !! its weared
Dunno ask here as suggested:
Quote from: BOSSKILLER on 19-September-08, 13:35:27
According to manual should have 400 option{That will keep it in 1:1}:
System Memory Frequency
This setting allows you to set the bus frequency for installed DRAM. Settings: [Auto],
[400MHz], [533MHz], [667MHz].
Have a ask here: http://ocss.msi.com.tw/ if 400 is N/A.

MSI P45Neo-F FSB:DRAM problem

Hi everybody! I need help!
My system:
Motherboard: MSI P45Neo-F (with lastest BIOS)
CPU: Intel C2D E7400 2.8Ghz @3.5Ghz (350Mhz x 10)
FSB:DRAM = 1:1 (manual setting)
RAM: 4x1GB DDR2 800 @700Mhz 5-5-5-15
System runs fine and stable with those overclocking setting, but the only problem is when the computer is turned off and cut the power (disconnect the cable or switch off the PSU) and then turned on the computer can not boot and I have to clear the BIOS to boot again with default setting. I found that problem was caused by the wrong FSB:DRAM setting: after cutting power then turn on, FSB:DRAM automatically returns to [Auto] value, causing the DRAM frequency was set to over 1000Mhz and the PC can not boot! It only happens when the PC is turn on affter cutting power, if I just shutdown and leave the PSU on, it's fine!
Any advice?

I'm using the lastest v1.9 BIOS, the older BIOS version came with the board had the same problem so I flashed to v1.9, but it doesn't work.
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Does this also happen when the system is running on default FSB Clock Settings?
ah... I'll check it.
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In which position are your OC Jumpers?
The OC Jumpers is left default. I haven't touch it yet!
Quote
try a new cmos battery
I don't think it's about CMOS battery has run out, the board still keeps FSB, Voltage settings... just the FSB:DRAM return to [Auto] when switch on.
Thanks for support!

MSI P31 Neo and FSB/DDR ratio

I purchased P31 Neo -mb and E2160 processor.
I've red that this processor could easily hit 3.0 Ghz with 333 mhz fsb. The problem is that I can't find a setting from P31 Neo's bios that would allow to unlock FSB/DDR ratio. There is only Auto, 1:1.66 and 1:2 setting for FSB/DDR ratio. When I raise the FSB the DDR speed quickly raises over 800 Mhz and the system doesn't post. 2160 Mhz is the top that i've managed to overclock E2160 because my DDR2-chips can't handle the higher FSB speeds.
Can I do something about this or should I swap P31 Neo to some P35-chipset mobo that would allow more flexible FSB/DDR ratio settings?

Hello Aacko,
the P31 Neo is a budget board that is not really designed for overclocking (notice the red PCB). The P31 chipset supports DDR2-667 and DDR2-800 memory modules. With a FSB-200-MHZ-CPU installed, 1:1.66 and 1:2 are exactly the ratios you need to get your RAM to 667 MHz or 800 MHz.
Quote
Can I do something about this or should I swap P31 Neo to some P35-chipset mobo that would allow more flexible FSB/DDR ratio settings?
If you really want to overclock, you should go for a P35 Platinum or P35 Neo2-FR/FIR board.

Some question and problems on FSB:Dram

Hi to all, i have a simple question fo you (i hope that's simple :D )
I have a p4 3.2 GHz like you can see here:
FSB is 200Mhz and it's ok
But i have 4 pc3200 ram modules in dual channel mode, i think that their frequency must be 200Mhz but it's only 160, and i can't activate pat, like yuo can see here:
Now my question is: Why?
Thank to all

Quote
Originally posted by NovJoe
Simple, as displayed in the second picture, you've set your DRAM Frequency to DDR 333MHz which will be detected as 320MHz for FSb 800MHz CPU on DDR 400MHz RAMs. Due to this, CPU-Z will think that you are running in 5:4 ratio instead of 1:1 ratio. To obtain 1:1 ratio, you must set your DRAM Frequency to 400MHz in BIOS and make sure that DDR Clock is reading it at 400MHz also before saving to CMOS. Check with CPU-Z again and you'll see that it'll display 200MHz(RAMs are double rated where you've to multiply the rates by 2) and ratio at 1:1.
Isn't so easy...
My actual configuration:
Dynamic Overclocking: Private
Performance Mode: Slow (If i put fast or greater... KABOOM :D)
CPU Ratio: Locked
DRAM Frequency: 400Mhz
Spread Spectrum: Disabled
Adjust CPU Bus Clock(Mhz): 200
DDR Clock: 333 (Adjust AGP/PCI Clock (Mhz): 66.66/33.33
CPU Vcore Adjust: NO
CPU Vcore: 1.5500V
DDR Power Voltage: 2.65V
AGP Power Voltage: 1.55V
I can't understend why DDR Clock is 333 :(

1:1 FSB:Memory ratio on 865pe fisr (250+Mhz)

Does anyone have memory that is capable of running 250mhz and over? I was interested in knowing whether the bios changes your ratio to 5:4 when you select 250mhz FSB and over like mine does. I don't know why it changes the ratio when the ram is capable of running at 250+ on 2.7V easy. Nothing is holding me back as I have tested all relevant components at required voltages so it is strictly a bios/mobo issue as I see it. Do any of the 5 bioses for the 865pe allow for higher than 250mhz 1:1 ratio? Could it be the brand of memory I have? It is detected as pc3200 memory which is actually a good thing cause it 'tricks' the mobo into thinking it is compatible ram. But even if the ram is not on the list of 'compatible' ram modules, this should not cause such a problem as that. My theory is that this MSI board has set parameters coded into the bios that govern the way the mobo behaves IRRESPECTIVE of the capabilites of the components in the system. If your mem modules, cpu, etc. fall under a certain category defined by MSI, the mobo will change them back to a default or 'safer' setting if you increased it beyond what the deem is acceptable. How do I know this? Well if you use an utility that allows you to change parameters in windows, such as MSI's very own corecenter you will see that the computer will run at a speed that it would not run at if set in the bios (assuming that your components are capable of running at increased speeds). If anyone has done extensive testings and can tell me which of the 5 current bioses are the least restrictive on user settings, can they please let me know?
My sys specs are:
MSI NEO2 865PE FISR
P4 2.4C 800 FSB
2x512MB ADATA PC4000
ATI Radeon 9700
WD 40GB 8MB Cache
IBM Deskstar 120GXP 40GB
Lite-On 16x DVD rom
Enermax 550W PSU
As of now I am in hardcore diagnostic OC mode. I am taking the time to verify the limits of each of my components separately. Only one component is stressed at any one time and the others are all run as below spec as possible. Lets see what turns up. Let me know what bios works best for you guys.

U had any problems with u'r ADATA DDR 500?
Where did u pick it up??
see my other post for my specs
http://www.msi.com.tw/program/e_service/forum/index.php?threadid=27815&boardid=10&styleid=1&sid=f383feb6d3080c2e532cb89a2201c498

FSB:RAM ratio on MSI KM4AM-V...CHANGE???

Hello.
I was wondering if anyone knows how to change the FBS:RAM ratio on this board.
It is currently 1:1 but i would like to change it to 10:9 if possible or anything close to that...
Thanks for any help.
roddy

You're probably right, but what could we do without these kind of problems? I mean, if everything would be fine and the computers work out all the time, what could we do? I think that our life without these little problems would be a messy for us! Boring it's the perfect word to express the way our lives would be.
So you could try changing the jumpers on the board overclocking the FSB of the processor because on the SETUP you cant see anything ralated to change FSB or memory frequences, so just do it, but by your own risk
Bye, and thanks for remebering me the meaning of life.

FSB\DRAM Ratio

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