DDR2 667 only run 533

[mclarenr]

Hi guys, I'm newbie here.
I just bought new computer few days ago, here's the spec :
- Mobo Intel D945GNTL
- Pentium D 805
- 2x 1GB DDR2 667Mhz Corsair Value Select
- Seagate 80GB SATA II
I wonder why does my RAMs only run at 533Mhz? Is it because my CPU only has 800Mhz FSB?
I've tried to change the setting in BIOS but, everytime I changed it, my computer didn't boot. What I got was 3x beep. So I have to move the jumper into safe mode and load the BIOS default.
How can I make my RAMs run at 667Mhz?

 

[mpjesse]

The Pentium D 805 runs on a 533mhz FSB- not 800mhz.

Sorry bud... looks like you got the wrong Pentium D.

 

[chuckshissle]

So return that ram and get a 533Mhz for replacement or swap to a better cpu.

 

[mclarenr]

Sorry I mistype that FSB, I know it's only 533Mhz, but is this mean that I can't run my RAMs at 667? Is there any way I can make it without replacing the CPU or mobo?

 

[Farhan]

You can use 667MHz bus only when you are using a processor that runs at minimum 800MHz FSB. I believe you can find this fact in your motherboard manual.

 

[mclarenr]

A new motherboard and your 805 will be running over 3.2Ghz in no time even with stock cooler.
Then you can take advantage of your RAM.

So normally RAM can't run faster than FSB? If I force my RAM faster than FSB will that be called overclock? AFAIK overclocking = increasing CPU clock.
And can you mention that "new motherboard"?
At first I was planning to buy Asus P5LD2-VM, but it was out of stock, so did Gigabyte and MSI. So I bought this Intel mobo.

 

[levicki]

If you can force it in BIOS (by changing the RAM divider, not the FSB) to run at 667 then do it, it will work fine.
If you can push your CPU to 166MHz FSB and make it work stable (and it should go from 133 to 166 easily since it is not that much of an overclock) then you will also force RAM to work at 667 and keep it 1:1 with the CPU which should give you better results.

@all:
805 is not bad CPU, it is the cheapest dual-core but it can be clocked as high as 3.7GHz with adequate cooling and good mainboard.

 

[mclarenr]

If you can force it in BIOS (by changing the RAM divider, not the FSB) to run at 667 then do it, it will work fine.
If you can push your CPU to 166MHz FSB and make it work stable (and it should go from 133 to 166 easily since it is not that much of an overclock) then you will also force RAM to work at 667 and keep it 1:1 with the CPU which should give you better results.

@all:
805 is not bad CPU, it is the cheapest dual-core but it can be clocked as high as 3.7GHz with adequate cooling and good mainboard.

I can't find neither RAM divider in my BIOS nor FSB setting, the only thing I can adjust is the RAM speed (400, 533, 667) and RAM timing. But everytime I set to 667 it won't boot and I get 3x beeps. Is this mean Intel D945GNTL is not overclock-able?

 

[mpjesse]

Couple things:

Like we said earlier, the Pentium D 805 runs on a 533mhz FSB (that's 4x133mhz).

By forcing the RAM to run at 667mhz, you're effectively trying to tell the motherboard to run on a 1.33Ghz FSB (4x333mhz) and you're telling the processor to run at 6.66Ghz.

The multiplier on Pentium 4's/D's are locked, meaning they cannot be changed. The multiplier on the Pentium D 805 is 20. (20x133mhz=2.66Ghz) Since you can't change the multiplier (20) your telling the motherboard to do 20x333mhz, which is a 6.66Ghz overclock on the processor! That's why it won't boot. It's not possible.

If you still don't understand please STOP messing with your motherboard before you destroy it. If you do not understand the basic concept of multipliers and FSB's you shouldn't be messing w/ it until you figure out how it works.

Just some advice.

 

[luminaris]

Just overclock that 805 and it will take advantage of that 667 RAM. That actually gives you some serious headroom.

 

[mclarenr]

Couple things:

Like we said earlier, the Pentium D 805 runs on a 533mhz FSB (that's 4x133mhz).

By forcing the RAM to run at 667mhz, you're effectively trying to tell the motherboard to run on a 1.33Ghz FSB (4x333mhz) and you're telling the processor to run at 6.66Ghz.

The multiplier on Pentium 4's/D's are locked, meaning they cannot be changed. The multiplier on the Pentium D 805 is 20. (20x133mhz=2.66Ghz) Since you can't change the multiplier (20) your telling the motherboard to do 20x333mhz, which is a 6.66Ghz overclock on the processor! That's why it won't boot. It's not possible.

If you still don't understand please STOP messing with your motherboard before you destroy it. If you do not understand the basic concept of multipliers and FSB's you shouldn't be messing w/ it until you figure out how it works.

Just some advice.

Thank you for you advice mpjesse, I think I have some knowledge about OC but it has been years since my last computer (2001 :? ).
Sorry where did 333 Mhz come from? I think it should be 166 since 667/4=166. And 20x166=3.3Ghz wow! 8O
But I don't think that's what gonna happen, coz I've tried to lower my RAM to 400Mhz, and the FSB was still running at 533, proc still 2.66Ghz. So why can I make my RAM at 667?
There's no other way running my RAM at 667 without changing my Mobo or CPU?

 

[amnotanoobie]

I think you got all the freqeuncies mixed up.

1st and foremost, pentium 4's use a quad bus so, 800MHz / 4 = 200 MHz. so 200 MHz is the actual bus speed.

2nd DDR memory frequencies are actually multiplied by 2, since (i forgot the actual explanation) it has something to do with 2 things being done in 1 clock cycle at a time. Thus DDR 266MHz actually runs at 133, 333 runs at 166, 400 runs at 200MHz. This is also the case with DDR2, a DDR2 533MHz ram runs at 266MHz (in reality).

You don't divide the ram frequency by 4 and then multiply by 4. You only overclock by raising the FSB, NOT THE RAM SPEED. In synchronous mode, if you raise the FSB, the RAM speed also goes up! In asynchronous mode, wherein you set the two independently, i know that you can't raise the mem speed higher than the FSB. That's why it won't boot, it simply can't be done.


ON THE BIGGER AND THE ONLY ACTUAL IMPORTANT PART OF THIS POST:
The 945GNTL is a board that you can't OC, period. I also have the board and it has no option of setting the FSB, so any OC dreams are crushed with this board. The Mem speed settings are only left open because if you have say a 800MHz FSB CPU, and say you want lower mem latencies, you could throttle down the 667 to 533 and set the proper latencies. YOU CANT up the thing if you're using a proc with a 533 FSB.


Though i do hope that you're able to read this.

 

[Mondoman]

... i know that you can't raise the mem speed higher than the FSB. ...

Just a note for lurkers that this is not true in general.

am - it's not very likely that the OP will spot a reply to a 5-month-old thread...

 

[atomicplayer]

amnotanoobie replaced the real facts

but yeah its possible to run the ram higher than the fsb. If the possibily of choosing 667 is there, its because it applies a ratio cpu:ram of 3:5 when you get a cpu that runs at fsb200.

if you couldnt run ram faster than the fsb, the option wouldnt be there.

now I dont know what the mobo does when a cpu with fsb133 is installed. And I dont understand why it wont boot