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post #801 of 12349
I've seriously read about loads of stuff and I can't find a simple formula for working out the FSDRAM memory divider.
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post #802 of 12349
Thread Starter 
Quote:
Originally Posted by TheFoister View Post
I have another question about rams.

What happens if we install ddr2-1066mhz rams to our board? Will it recognize them as ddr2-1066?

I feel like I need to get a pair since my target FSB will be in 250-300mhz range when overclocking 720BE (hopefully).
Yes your board will be happy w/ddr1066 pc8500 Ram, No it will not recognize it as such. you will have to overclock your cpu to get the ram as close to ddr1066 as possible. Just set the ddr option in bios to ddr800

Hope this helps,

N2G
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post #803 of 12349
Quote:
Originally Posted by princip View Post
I've seriously read about loads of stuff and I can't find a simple formula for working out the FSDRAM memory divider.
OK Princip,

This cost me like 5 minutes, so it couldnt be all that hard.


I got my info via google and found my answer on anandtech


The memory frequency calculation for AM2 CPU's is as follows (note not for phenoms and such, only for AM2):

CPU frequency / round up (cpu multiplier / memory divider)


Note that the above formula works for even, odd and half cpu multipliers. The crucial part is that you have to round up the division of the cpu multi and the memory divider to the nearest whole number!

The memory divider is different for the different memory speeds:
DDR2-533: 4/3
DDR2-667: 5/3
DDR2-800: 2

Example:
CPU frequency: 2800
CPU multiplier: 14
memory divider: 2 (DDR2-800)

Memory frequency: 2800 / round up ( 14 / 2) = 2800 / 7 = 400 MHz. This is the value you can read out with CPU-Z. Since it's DDR2 it has an effective frequency of 2*400 = 800 MHz

In case you change your CPU multiplier, the formula still stands:
My athlon 6000 runs at a speed of 3100 (FSB = 200; CPU multi = 15.5).

CPU frequency: 3100
CPU multiplier: 15.5
memory divider: 2 (PC6400 = DDR2-800)

3100 / round up (15.5 / 2) = 3100 / round up (7.75) = 3100 / 8 = 387.5 MHz Which is effective 2 x 387.5 = 775 MHz

The formula stands for OC-ed CPU's
If I increase the CPU speed to 3410 ( by a 10% increase in FSB to 220MHz)
The memory frequency will be:
3410 / round up (15.5 / 2) = 3410 / round up (7.75) = 3410 / 8 = 426.25 MHz Wich is effective 2 x 426.25 = 852.5 MHz

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post #804 of 12349
Thats very clarifying. Thankyou.

And what about the calculation in phenoms (including Ph II)?

Quote:
Originally Posted by Supergroover View Post
OK Princip,

This cost me like 5 minutes, so it couldnt be all that hard.


I got my info via google and found my answer on anandtech


The memory frequency calculation for AM2 CPU's is as follows (note not for phenoms and such, only for AM2):

CPU frequency / round up (cpu multiplier / memory divider)


Note that the above formula works for even, odd and half cpu multipliers. The crucial part is that you have to round up the division of the cpu multi and the memory divider to the nearest whole number!

The memory divider is different for the different memory speeds:
DDR2-533: 4/3
DDR2-667: 5/3
DDR2-800: 2

Example:
CPU frequency: 2800
CPU multiplier: 14
memory divider: 2 (DDR2-800)

Memory frequency: 2800 / round up ( 14 / 2) = 2800 / 7 = 400 MHz. This is the value you can read out with CPU-Z. Since it's DDR2 it has an effective frequency of 2*400 = 800 MHz

In case you change your CPU multiplier, the formula still stands:
My athlon 6000 runs at a speed of 3100 (FSB = 200; CPU multi = 15.5).

CPU frequency: 3100
CPU multiplier: 15.5
memory divider: 2 (PC6400 = DDR2-800)

3100 / round up (15.5 / 2) = 3100 / round up (7.75) = 3100 / 8 = 387.5 MHz Which is effective 2 x 387.5 = 775 MHz

The formula stands for OC-ed CPU's
If I increase the CPU speed to 3410 ( by a 10% increase in FSB to 220MHz)
The memory frequency will be:
3410 / round up (15.5 / 2) = 3410 / round up (7.75) = 3410 / 8 = 426.25 MHz Wich is effective 2 x 426.25 = 852.5 MHz

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post #805 of 12349
Quote:
Originally Posted by TheFoister View Post
Thats very clarifying. Thankyou.

And what about the calculation in phenoms (including Ph II)?
LOL

I have no idea, I do know that it's different. I think they changed the working of the memory controller in the AM2+ and AM3 processors. SO I think you'll need to google it yourself. There's a lot of information on it on the web. I'm sure you can figure it out. Maybe there's some info on our forum as well, that would be a great start ofcoarse.
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post #806 of 12349
Thread Starter 
Quote:
Originally Posted by TheFoister View Post
Thats very clarifying. Thankyou.

And what about the calculation in phenoms (including Ph II)?
WOW Google is your friend by the way.
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post #807 of 12349
anyone ever rma'd one of these boards? is asus hard to work with?
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post #808 of 12349
Thanks alot Super
I did find the information a couple of days ago but lost it and couldn't find it again, I've been pulling my hair out to find it since. really helpful stuff
Lenin
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Lenin
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post #809 of 12349
Thread Starter 
Quote:
Originally Posted by test tube View Post
anyone ever rma'd one of these boards? is asus hard to work with?
well I had a defective board and they send my defective board back to me then they sent me a different defective board and on the 3rd rma they finally sent me a good board that I'm on right now.

Hope this helps,

N2G

PS: If they send you a defective board from the first RMA get them to pay for the shipping and handling since they are the one who is making the mistake's. Note you have to know for sure that your board is bad and the returned board is bad. I have more then one of these boards so I know for sure if my hardware works in the board or not by testing with the other boards.
Edited by N2Gaming - 2/24/09 at 6:02pm
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post #810 of 12349
By tomorrow I should, I'm going to test it with a new PSU, then test all the other components on a new motherboard. There's a possibility the PSU is just a piece of **** so I'm waiting to see if that's the problem.
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