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.)

Similar Messages

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.)

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
Quote
AH HA!! Modify to modify my post! gotcha! lol sorry ... i'm slow (i added this line with modify see i'm learning... lol)
Quote
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?)

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.

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?

Quote
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:
Quote
Supports Front Side Bus (FSB) at the following Frequency Ranges: - 800/1066 (200/266MHz)
and Page 25:
Quote
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:
Quote
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/
Quote
The Intel chipset is capable of offering 1:1
Capable: yes, native support: no.
Quote
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.

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.
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.

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.

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.

P31 Neo-F - E6550

MSI P31 Neo-F (Bios 1.2) Rev 1.0
Corsair 6400XMS2 2 x 1Gb (Dimm1 & Dimm3)
C2D E6550 (7x333=2.33Ghz by default)
I cannot overclock this by even one hertz.
I have FSB\memory ratio at 1:1 so that memory is at 667 and CPU is at 1333 which is all fine. As soon as I up the CPU\FSB it won't reboot. Is 1333 as fast as this board can handle?

Quote from: BOD on 06-March-08, 02:05:20
Thats a daft reply as it blatantly allows you to modify everything.
Daft, but true and to the point. I could of wrote a load of rubbish if you wanted?

MSI P31 NEO

Hi!
I'm TyrrelCorp, and i'm from Portugal.
First of all... i apologise for my english... it's a little bit "rusty".
So... the problem:
I've a MSI P31 NEO mainboard. Until now it gave no problems, but when i upgrated from 2GB memory to 4GB... it doesn't load Windows.
I've 4x1GB, 667MHz sticks.
My system is:
OS: Windows 7 Ultimate 64Bits SP1 - http://windows.microsoft.com/pt-PT/windows7/products/compare?T1=tab09
Mainboard: MSI P31 NEO - http://www.msi.com/product/mb/P31-Neo.html#Spec
Chipset: Intel P31 - http://www.intel.com/products/desktop/chipsets/p31/p31-overview.htm
CPU: Intel Core2 Duo E6300 1.86 Ghz - http://ark.intel.com/products/27248/Intel-Core2-Duo-Processor-E6300-%282M-Cache-1_86-GHz-1066-MHz-FSB%29
Memory: 4x1GB DDR2 667 MHz (2x OEM + 2x Kingstone)
HDD: Samsung 300GB SATA I/WD 1TB/WD 500GB/WD 1TB
Video: ATI Radeon HD 5450 - http://www.amd.com/br/products/desktop/graphics/ati-radeon-hd-5000/hd-5450-overview/Pages/hd-5450-overview.aspx
Sound: Realtek High Definition Audio Codecs - http://www.realtek.com/downloads/downloadsCheck.aspx?Langid=1&PNid=24&PFid=24&Level=4&Conn=3&DownTypeID=3&GetDown=false#High%20Definition%20Audio%20Codecs
Optical: LG GSA-H20L - http://www.videohelp.com/dvdwriters/lg-gsa-h20l/1561
Cooling: Artic Cooling Freezer 7 PRO REV.2 - http://hi-techreviews.com/index.php/review-links-mainmenu-80/9878-arctic-cooling-freezer-7-pro-rev-2
Powersupply: LPJ12 500 TC Silent - OEM
I've already trieded with two sticks only, 2GB... and it starts fine. All the memory sticks work fine... in pair. All four, nothing.
Thanks...

Quote from: Henry on 17-July-11, 05:38:00
"I've noticed that two of the memory sticks are single sided and the other two are dual sided! Could this be the origin for the problem?"
It seems you are using 2 high density sticks and 2 low density sticks. tRFC would certainly be different between the 2. Don't mix memory like that as you will have problems. To avoid memory problems like that ensure that all 4 are the same. Best would be 2x4 GB kit. At the very least get another kit the same as the 2 new ones and don't use the old ones.
Well... i thought memory sticks would have to be same capacity (this case, 1Gb) and same velocity, 667MHZ.
Never thought about SS or DS.
In this case... the older ones, OEM, are DS... the new ones, Kingstone, are SS... witch are better to keep and to buy new ones?

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.

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 P31 Neo Bios help

Hi everybody. I have an old style P31 Neo which supports ddr2 800 mhz ram. Now i can not make any overlock even 1 fsb. What is my problem. Bios or anything else. i have an E6750 and corsair 2x1 ddr2 800. these parts was working @3,2 and 1066 mhz with P43 mainboard. But with the P31 they are on standarts. Need your help. Thanks

does it manage to detect any ide devices at all? if not then its probable maste/slave jumper settings... if it does detect them, then its probably cos u need to install windows

P31 NEO with 4x 1Gb memory problem

Hi,
I just met the problem with my P31 NEO mobo which doesn't accept my 2 new Corsair 1Gb CM2X1024-6400C4 - 4-4-4-12 (2.10V ver6.3)
I've already have 2 Corsair 1Gb CM2X1024 - 5-5-5-12 (1.9V ver5.2) which work fine.
Is it possible to make them all work (they seem to be single-sided but not sure) ?
If yes, wich parameters need to bet set ?
Thanks a lot in advance for your answers.
Fred

You can try to set them all to 5-5-5-12 and see what happens.
Im not sure also if your memorycontroller, an ICH7, will "accept" 4x1GB @ 800MHz.
I know that some older memorycontrollers will have problems running "double" dualchannel.
My board for instance, ICH9 memorycontroller, can only operate @667 MHz when all 4 slots are occupied.
The P45 and certainly the newer models, ICH10(R) controller, can take up to 1066MHz in double dualchannel.
If 800MHz dosnt work, look with cpu-z to see what the setting would be @667MHz and adjust them accordingly and see if that works.
If that doenst work either, your probably better of buying 2x2GB.
Succes and keep us posted

Fsb/dram ratio on p31 neo

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